ii) Recent Talks and Seminars

iii) Research Reports

iv) Patents

  I. Papers:

 104Valeri Petkov, Nick Bedford, Marc R. Knecht , Michael G. Weir , Richard M. Crooks , Wenjie Tang ,Graeme Henkelman  and Anatoly   Frenkel “Periodicity and atomic ordering in nanosized particles of crystals" J. Phys. Chem. C 112 (2008) 8907 .

"Functionalization and grafting of platinum nanoparticles on alumina surfaces: an FT-IR and XPS study", Langmuir 24 (2008) 5832 .

102. Swapan K. Pradhan, Yuanbing Mao, Stanislaus S. Wong, Peter Chupas and Valeri Petkov, “Atomic-scale structure of nanosize titania and titanate: particles, wires and tubes”, Chem. Mat. 19 (2007) 6180 .

101. N. Bedford, G. Viau, P. Chupas and V. Petkov, “3D structure of nanosize catalysts by high-energy XRD and RMC simulations: study of Ru”, J. Phys. Chem. C 111 (2007) 18214 .
 

M. Gateshki, Q. Chen, L.-M. Peng, P. Chupas and V. Petkov "Structure of nanosize materials by high energy XRD: study of titania nanotubes", Zeit. Kristall. 222 (2007) 612 .

99. S. K. Pradhan,  Z. T. Deng, F. Tang, C. Wang, Y. Ren , P. Moeck and V. Petkov, “

3D structure of CdX (X=Se, Te) nanocrystals by total x-ray diffraction”, J. Appl. Phys. 102 (2007) 044304 .

", Chem. Mater. 19 (2007) 2512 .

 .

96. M. Gateshki, M. Niederberger, A. S. Deshpande, Y. Ren and V. Petkov, "Atomic-scale structure of nanocrystalline CeO₂-ZrO₂ oxides by high-energy X-ray diffraction", J. Phys.: Condens Matter., 19 (2007) 156205  .

95. V. Petkov, T. Ohta, Y. Hou and Y. Ren  “Atomic-scale Structure of Nanocrystals by High-Energy X-ray Diffraction and Atomic Pair Distribution Function Analysis: Study of Fe_xPd_100-x (x=0, 26, 28, 48) nanoparticles”, J. Phys. Chem. C 111 (2007) 714 .

Local structure, bonding and phase-change behavior in the chalcogenides K_1-xM_xSb₅S₈ (M= Rb, Tl) Solid State Chem. 180 (2007) 420 .

V. Petkov, T. Hyeon, M. Niederberger and Y. Ren, “Interplay between the local structural disorder and the length of structural coherence in stabilizing the cubic phase in nanocrystalline ZrO2”, Solid State Comm.. 138 (2006) 279 .

V. Petkov, M. Gateshki, M. Niederberger and Y. Ren, "Atomic-scale Structure of Nanocrystalline Ba_xSr_1-xTiO₃ (x=1,0.5,0) by X-ray Diffraction and the Atomic Pair Distribution Function Technique”. Chem. Mater. 18 (2006) 814 .  

91. V. Petkov,  M. Gateshki, J Choi, E.D. Gillian and Y. Ren, " Structure of nanocrystalline GaN from X-ray diffraction,
Rietveld and atomic pair distribution function analyses", J. Mater. Chem. 15 (2005), 4654 .

90. V. Petkov, Y. Peng, G. Williams, B. Huang, D. Tomalia and Y. Ren, “Three-dimensional structure of gold nanoparticles in water by x-ray diffraction and computer simulations”, Phys. Rev. B 72 (2005) 195402 .

89. M. Gateshki, V. Petkov, S. K. Pradhan and T. Vogt, “Structure of Nanocrystalline MgFe2O4 From X-ray Diffraction, Rietveld and Atomic Pair Distribution Function Analysis”, J. Appl. Cryst. 38 (2005) 772 .

88. Toni Spassov, Valeri Petkov and P.Solsona , “Hydriding/dehydriding of Mg87Ni3Al3Mm7 (Mm=La,Ce-rich mischmetal) alloy produced by mechanical milling”, J. Alloys and Compounds 403 (2005) 363 .

87. Valeri Petkov, Vencislav Parvanov, Pantelis Trikalitis, Christos Malliakas, TomVogt and Mercouri Kanatzidis, “Three-dimensional structure of Nanocomposites from Atomic Pair Distribution Function Analysis: Study of Polyaniline and (Polyaniline)xV2O5.nH2O”, J. Am. Chem. Soc. 127 (2005) 8805 .

86.  Jin Luo, Mathew M. Maye, Valeri Petkov, Nancy N. Kariuki, Lingyan Wang, Peter Njoki, Derrick Mott,  Yan Lin, and Chuan-Jian Zhong, “Carbon-Supported AuPt Nanoparticles with Different Bimetallic Compositions”, Chem. Mater.,  17 (2005) 3086 .

85. M. Gateshki, V. Petkov, G. Williams, S. K. Pradhan and Yang Ren, "Atomic scale structure of nanocrystalline ZrO2", Phys. Rev. B 71 (2005) 224107 .  

84. . S. J.L. Billinge, E.J. McKimmy, M. Ahatnawi, H-J Kim, V. Petkov, D. Wermeille, T.J. Pinnavaia, “Mercury binding sites in Thiol-functionalized mesostructured silica” ,  J. Am. Chem. Soc. 127 (2005) 8492 .

83. W. Yao, S.W. Martin and V. Petkov, “Structure determination of low-alkali-content Na2S + B2S3 glasses using neutron and synchrotron x-ray diffraction”, J. Non-Cryst. Sol. 351 (2005) 1995 .

82. S.K. Pradhan, S. Bid, M. Gateshki and V. Petkov, ”Microstructure characterization and cation distribution of  nanocrystalline magnesium ferrite prepared by ball milling”, Mat. Chem. Phys. 15 (2005) 224  .

81. V. Petkov, “Atomic-scale structure of glasses using high-energy x-ray diffraction”, J. Am. Ceram. Society  88 (2005) 2528 .

80. Wenfu Yan, Valeri Petkov, Shannon M. Mahurin and Sheng Dai, “ Ultra-small gold nanoparticles on titania modified SBA-15”, Catal. Communications 6 (2005) 404 .

79. V. Petkov, V. Parvanov,  D. Tomalia, D. Swanson, D. Bergstrom and T. Vogt, “3D structure of dendritic and hyper-branched macromolecules by x-ray diffraction”, Solid State Communications, 134 (2005) 671  .

78. Milen Gateshki, Seong-Ju Hwang, Dae Hoon Park, Yang Ren, and Valeri Petkov, “Structure of exfoliated  titanate nanosheets determined by atomic pair distribution function analysis”, Chem. Mater. 16 (2004) 5153.

77. E. Bozin, V. Petkov, P. Barnes, P. Woodward, T. Vogt, S. Mahanti and S.Billinge, “Temperature dependent  total scattering structural study of CaCu3Ti4O12”, J. Phys.: Condens. Matter 16 (2204) S5091. 

76. M. Gateshki, Seong-Ju Hwang, D. H. Park, Y. Ren, and V. Petkov, "Structure of Nanocrystalline Alkali Metal Manganese Oxides by the Atomic Pair Distribution Function Technique", J. Phys. Chem. 108 (2004) 14876 .

75. M.A. Morales, D.S. Williams, P.M. Stand, C. Stark, T.M. Pekarek, L.P. Yue, V. Petkov and D.L. Leslie-Pelecky, “Disorder-Induced Depression of the Curie temperature in Mechanically Milled GdAl2”, Phys. Rev. B 70, (2004) 184407 .
 
74. V. Petkov, “Atomic-scale structure of nanocrystals by the atomic pair distribution function technique”, Molecular Simulations 31 (2005) 101.

73. V. Petkov, P. Y. Zavalij, S. Lutta, M. S. Whittingham, V. Parvanov and S. Shastri, "Structure beyond Bragg: Study of V2O5 nanotubes", Phys. Rev. B 69 (2004) 085410 .

72. D. Williams, P.M. Shand, T. Pekarek, R. Skomski, V. Petkov and D.L. Leslie-Pelecky, “Magnetic transitions in disordered GdAl2”, Phys. Rev. B 68 (2003) 214404. . 

71. V. Petkov, D. Qadir and S. Shastri, “Rapid structure determination of disordered materials: study of GeSe2 glass”, Solid State Comm. 129 (2004) 239 .

70. V.Petkov and T .Vogt, ‘Positional disorder of Ba in the thermoelectric germanium clathrate Ba6Ge25”, Solid State Comm. 127 (2003) 43.

69. P.Trikalitis, Valeri Petkov and M. G. Kanatzidis “Structure of Redox Intercalated (NH4)0.5V2O5.mH2O Xerogel Using the Pair Distribution Function Technique”, Chem. Mater. 15 (2003) 3337.

68. V. Petkov, “Structure determination of nanocrystalline materials by the atomic pair distribution function technique”, Adv. X-ray Anal. vol. 46 (2003) 31.

67. S-J. Hwang, V. Petkov, K.K. Rangan,  S. Shastri and M.G. Kanatzidis, "Structure of nanocrystalline materials with intrinsic disorder from Atomic Pair Distribution Function Analysis: The Intercalation compound AgxMoS2", J. Phys. Chem. B 106 (2002) 12453. .

66. V. Petkov , S.J.L. Billinge, T .Vogt, A.S. Ichimura and J.L. Dye, "Structure of intercalated Cs in zeolite ITQ-4: an array of metal  ions and correlated electrons confined in a pseudo-1D nanoporous host", Phys. Rev. Lett. 89 (2002) 075502.

65.  V. Petkov, E. Bozin, S.J.L. Billinge, T. Vogt, P. Trikalitis and M. Kanatzidis, "Structure of nanocrystalline V2O5.nH2O xerogel determined by the atomic pair distribution function technique",  J. Am. Chem. Soc.  124 (2002) 10157. 

64.  V. Petkov, S.J.L. Billinge, P. Larson, S.D. Mahanti, T. Vogt, K. K. Rangan and M. Kanatzidis, "Structure of nanocrystalline materials using atomic pair distribution function analysis: Study of LiMoS 2" Phys. Rev. B.  65 (2002) 092105. 

63.  Th. Proffen, V. Petkov, S.J.L. Billinge and T. Vogt, "Chemical short-range order obtained by the atomic pair distribution function", Z. Kristallogr. 217 (2002) 47. 

62.  T. Pauly, V.Petkov , Y. Liu, S.J.L. Billinge and T. Pinnavaia, "Role of sodium versus local framework structure in determining the hydrothermal stability of MCM-41 mesostructures", J. Am. Chem. Soc., 124 (2002) 99. 

61. V. Petkov, S.J.L. Billinge, S.D. Shastri and B. Himmel,  "High-resolution atomic distribution functions of disordered materials by high energy x-ray diffraction, J. Non-Cryst. Sol. 293/295 (2001) 726. 

60. S. J. L. Billinge, V. Petkov , Th. Proffen, G. H. Kwei, J. L. Sarrao, S. D. Shastri and S. Kycia, "Charge inhomogeneities in the colossal magnetoresistant manganites from the local atomic structure", Mater. Res. Soc. Symp. Proc.  602 (2001) 177. 

59. V. Petkov and S.J.L. Billinge, "Local structure of random In_xGa_1-xAs alloys by full-profile fitting  analysis of  atomic pair distribution functions", Physica B 305 (2001) 83. 

58. V. Petkov and S.J.L. Billinge, "Structure of crystallographically challenged materials by profile analysis of  atomic pair distribution functions", Mat. Res. Soc. Proceed . 678 (2001) EE.1.5.1. 

57. V. Petkov and S.J.L. Billinge, "From crystals to nanocrystals: semiconductors and beyond" in " From semiconductors to proteins: beyond the average structure", Kluwer Academic/Plenum Press (2001) p 153.

56. I-K. Jeong, F. Mohiuddin-Jacobs, V. Petkov, S.J.L. Billinge and S. Kycia, "Local structure of In _xGa_1-xAs  semiconductor alloys using high-energy synchrotron x-ray diffraction", Phys. Rev. B. 63 (2001) 205202. 

55. V. Petkov, S.J.L. Billinge, S. Sashtri and B. Himmel, 'Polyhedral units and connectivity in calcium  aluminosilicate glasses from high-energy x-ray diffraction', Phys. Rev. Lett. 85 (2000) 3436  .

54. O. Stachs, Th. Gerber and V. Petkov, "An Image plate chamber for x-ray diffraction experiments in Debye-Scherrer geometry", Rev. Sci. Inst. 71 (2000) 4007. 

53. M. Wachhold, K. Kashturi-rangan, M.F. Thorpe, S.J.L. Billinge, V.Petkov, J. Heising and M.G. Kanatzidis, 'Mesostructured metal germanium sulfide and selenide frameworks based on the tetrahedral Ge4(S/Se 10) units, J. Solid State. Chem. 152 (2000) 21.

52. V. Petkov, S.J.L. Billinge, J, Heising, M.G. Kanatzidis, S, Shastri and S. Kycia "High real-space resolution structure of materials by high-energy x-ray diffraction", Materials Research Society Symposia  Proceeding 590 (2000) 151.

51. V. Petkov, S.J.L. Billinge, J. Heising and M. Kanatzidis, "Application of atomic pair distribution  function analysis to materials with intrinsic disorder. Three-dimensional structure of exfoliated-restacked  WS2: Not just a random turbostratic assembly of layers" J. Am. Chem. Soc. 122 (2000), 11571  .

50. S.J.L. Billlinge, Th. Proffen, V. Petkov, J.L. Sarrao and S. Kycia, " Evidence for charge localization   in the ferromagnetic phase of La-Ca-Mn-O from high-real-space resolution x-ray diffraction", Phys. Rev B 62 (2000) 1203 .

49. V. Petkov , I-K. Jeong, F.M.-Jacobs, Th. Proffen, S.J.L. Billinge and W. Dmowski,  "Local structure of In0.5Ga 0.5As by joint high-resolution and differential pair distribution function analysis" J. Appl. Phys. 88 (2000) 665  .

48. M. Wachhold, K. Rangan, S.J.L. Billinge, V. Petkov, J. Heising and M. Kanatzidis, "Mesostructured non-oxide solids with adjustable worm-hole shaped pores: metal germanium selenide and sulfide frameworks based on the tetrahedral  {Ge 4/Oxygen10 } clusters", Adv. Mater. 12 (2000) 85  .

47. O. Stachs, V. Petkov , B. Himmel and Th. Gerber, "A secondary graphite crystal spectrometer for anomalous X-ray diffraction experiments", Nucl. Inst. & Methods A 434 (1999) 473.

46. O. Stachs, Th. Gerber and V. Petkov, "The structure formation of zirconium oxide gels in alcoholic solution", J. Sol-Gel. Sci. & Techn. 15 (1999) 23.

45. V.Petkov, I-K. Jeong, J.S. Chung, M.F. Thorpe and S.Kycia and S.J.L. Billinge, 'High-real space resolution measurement of the local structure of In_xGa _1-xAs semiconductor alloys using X-ray diffraction', Phys. Rev. Lett. 83(1999) 4089  .

44. V.Petkov, R.G. DiFrancesco, S.J.L. Billinge. M. Acharaya and H.C. Foley, 'Local structure of nanoporous carbon', Phil Mag. B 79 (1999) 1519  .

43. K. Kashturi Rangan, S.J.L. Billinge, V. Petkov, J. Heising and M. Kanatzidis, ' Aqueous mediated synthesis of mesostructured germanium sulfide with hexagonal order', Chem. Mater.  11 (1999) 2629.

42.V. Petkov , T. Sapassov, S. Surinah, and M. Baro “New Gd-Al nanophase obtained by crystallization of Gd₄Al₃ metallic glass”, Nano98 Conference, Stockholm, Nanostructured Materials 12 (1999) 609.

41. M. Acharaya, J. Mathews, M. Strano, S.J.L. Billinge,V. Petkov, S. Subramoney and H. C. Foley, ' Simulation of nanoporous carbons: a chemically constrained structure.' Phil Mag. B 79 (1999) 1499.

40. V. Petkov , O. Stachs, Th. Gerber, D. Ilieva and Y. Dimitriev, ' Atomic ordering in xGa₂O₃* (100-x)TeO₂ glasses  (x=10,17.5,25) by X-ray diffraction'. J. Non-Cryst. Sol. 248 (1999) 65.

39.V. Petkov and R. Danev, ‘IFO - a program for image reconstruction-type calculation of  atomic distribution functions for disordered materials’, J. Appl. Cryst . 31 (1998) 609.

38.V. Petkov , G. Holzhuter, , U. Troge, Th. Gerber and B. Himmel, 'Atomic -scale structure of amorphouTiO₂ by electron, X-ray diffraction and reverse Monte Carlo simulations’, J. Non-Cryst. Sol. 231 (1998) 17.

37. V. Petkov , Th. Gerber and B. Himmel, „Atomic ordering in Ca_x/2Al _xSi_1-xO₂ glasses (x=0.,0.34, 0.5,0.68) by energy dispersive X-ray diffraction“, Phys. Rev. B58 (1998), 11982.

36. M. Grigorova, H. Blythe, V. Blaskov, V. Russanov, V. Petkov, V. Masheva, D. Nihtianova, L. Martinez, A. Munoz and M. Mikhov, “Magnetic and Mosbauer spectra of nanosized CoFe₂O₄ powders”, J. Magn.Magn. Mater. 183 (1998) 163.

35. O. Stachs, V. Petkov and Th. Gerber , „Structure of ZrO₂SiO₂ gels“, J. Appl. Cryst. 30 (1997) 670.

34. K. Sugiyama, V. Petkov and S. Takeda, "Energy-dispersive X-ray diffraction (EDXD)  technique for structural studies of disordered materials. Application to SiO ₂ , SrP₂ O₅ , Pd₈₀Si ₂₀ , Fe₄₀Ni₄₀ P₁₄B₆ glasses and liquid Hg", Mater. Trans. High Temperature Materials and Processes 16(1997) 49.

33. T. Spassov, V. Petkov and U. Koster "Nanocrystallization, grain growth and phase transformations in rapidly quenched Co₃₃Zr₆₇alloys", Rapidly quenched and metastable materials Conference (RQ9, B ratislava, August (1996) Proceedings Elsevier, (1997) p. 225.

32. O. Stachs, Th. Gerber and V. Petkov , "Atomic ordering in xZrO₂ .(1-x)SiO₂ xerogels (x=0.3,0.5) by X-ray diffraction and reverse Monte Carlo simulations", J. Mat. Sci . 32 (1997) 4209.

31. O. Stachs, Th. Gerber and V. Petkov, "Atomic-scale structure of ZrO₂ xerogels by X-ray diffraction and reverse Monte Carlo simulations", J. Non-Cryst. Sol. 210 (1997) 14.

30. V. Petkov and G. Yunchov, "Atomic ordering in Bi₄ Ge₃O₁₂ melt by reverse Monte Carlo simulations’ J. Phys.: Condens. Matter 8(1996) 6145.

29. V. Blaskov,V. Petkov ,V. Rusanov, L. M. Martinez, B. Martinez, J. Munoz and M. Mikhov, "Magnetic properties of nanophase CoFe₂O₄ particles", J. Magn. Mag. Mater. 162 (1996) 331.

28.V. Petkov, K. Yano and E. Kita, "Atomic-scale structure of Gd _xFe _100-x melt-quenched amorphous alloys by X-ray diffraction (x=22,36,56)", Phys. Stat. Sol.  A157 (1996) 365.

27.V.Petkov and G.Yunchov, "Atomic ordering in liquid Se by unconstrained reverse  Monte Carlo simulations", J. Phys.: Condens. Matter.8 (1996) 1869.

26. D. Arsova, E. Vateva, E. Skordeva and V. Petkov, "New features of the medium range order in Ge_xAs_40-xSe₆₀ glasses", Solid State Commun. 98 (1996) 595.

25. V. Petkov and G. Yunchov, "Energy-dispersive X-ray diffraction and reverse Monte Carlo study on liquid Hg", J. Non-Cryst. Sol. 192&193(1995) 636.

24. V. Petkov , "Energy-dispersive X-ray diffraction analysis of disordered materials", J. Non-Cryst. Sol. 192&193 (1995) 65.

22.V. Petkov and G. Junchov, "Atomic-scale structure of liquid Sn, Ge and Si by reverse  Monte Carlo simulations",  J. Phys.: Condens. Matter 6(1994) 10885.

21.V. Petkov , S. Takeda, Y. Waseda and K. Sugiyama, "Structural study of molten  germanium by Energy- dispersive  X-ray diffraction", Journal of Non-Crystalline Solids , 168 (1994) 97.

20. V. Petkov and A. Apostolov, "Short-range order in TbCu₂ and DyCu₂ metallic glasses",Journal of Non-Crystalline Solids, 167 (1994) 255.

19. K. Sugiyama, V. Petkov , S. Takeda and Y. Waseda, "Energy-dispersive X-ray diffraction (EDXD) apparatus  for liquids at high temperature", Sci. Reports Inst. Tohoku University, A 38 (1993) 1.

18.V. Petkov and Y. Waseda, "PEDX: a program for radial distribution function analysis of energy-dispersive X-ray diffraction data from disordered systems", J. Appl. Cryst. 26 (1993), 295.

17. V. Petkov , A. Apostolov, G. Hilscher and H. Sassik, "Correlation between the degree of structural disorder and the frustration of magnetic order in Gd ₄ Mn₃ metallic glass", J. Magn. Magn. Mater . , 109 (1992) 309.

16. V. Petkov, V. Skumrjev and A. Apostolov,"Correlation between the structure and the magnetic properties in Gd₄Me₃ (Me=Al,Cu)", Mat. Sci.and Engn. A 133 (1991) 252.

15.V. Petkov , A. Apostolov and H. Sassik, "Short-range order in Gd₄Cu ₃ metallic glass", J. Non-Cryst. Sol. 122(1990) 262.

14.V. Petkov and N. Bakaltchev, "FIT, a computer program for decomposition of powder diffraction patterns and profile analysis of pair correlation functions", J. Appl. Cryst. 23 (1990) 138.

13.V. Petkov , "RAD, a program for analysis of X-ray diffraction data from amorphous materials for personal computers",J. Appl. Cryst. 22 (1989) 387.

12.V. Petkov, A. Apostolov and V. Skumryev, "Short-range order in RE₄Al₃ metallic glasses (RE=Pr,Gd,Tb,Dy)",  J. Non-Cryst. Sol. 110 (1989) 184.

11. V. Petkov , A. Apostolov, S. Neov, B. Sidjimov and I. Gerasimova, 'CRYSRDF, a computer program for structural diffusion model calculations", Proceedings of the Forth International Conference on X-ray diffraction methods, Nesebar, Bulgaria, 1989, p.113-117.

10. V. Petkov , A. Apostolov and V. Skumryev, "Radial distribution functions for RE ₄Al₃ metallic glasses (RE=Pr,Gd, Tb,Dy)", J. Non- Cryst. Sol. 108(1989) 75.

9. K. Petrov, D. Kovatcheva and V. Petkov , "Cationic distribution of Magnesium Cobalt Oxide Spinel Prepared by Thermal Decomposition of Mixed Hydroxide Nitrate Crystals", Bulg. J. Phys . 15(1988) 437.

8. V. Skumryev, H. Gamari-Seale,D-X Chen, V. Petkov, K. Rao and A. Apostolov, "Amorphous Gd₄Al₃ - a new ferroglass alloy",J. Phys. (Paris) 49 (1988) C8-1363.

7. A. Apostolov and V. Petkov , "Radial distribution functions for Gd₄Al₃ and Dy₄Al₃ metallic glasses", Zeitsch.  fur. Kristall . 185 (1988) 546.

6. V. Petkov , S. Kovachev, S. Savchenko, L. Bozukov, D. Kovacheva and S. Kovachev, "Automated
system for X-ray diffraction acquisition and reduction based on APPLE II microcomputers", Proceedings of the Third International Conference on X-ray diffractionmethods, Varna, Bulgaria, 1987, p. 38-41.

5. K. Petrov, V. Petkov and M. Mikhov, "Cationic distribution of Cu_x Co_3-xO₄ (0<x<1)",  Mat. Chem and Phys . 15 (1986) 511.

4. L. Markov, K. Petrov and V. Petkov, "On the thermal decomposition of some cobalt  hydroxide nitrates", Therm. Acta, 106 (1986) 283.

3. K. Petrov, V. Petkov and P. Rachev, "X-ray diffraction and electron microscopy studies on the morphology of the CuCo₂O₄ spinel prepared by thermal decomposition of copper(II)-Cobalt(II) hydroxonitrates", Mat. Chem. Phys .13 (1985) 577.

2. V. Petkov , D. Kovacheva and K. Petrov, "Practical aspects of the modeling of X-ray diffraction spectra from polycrystalline materials", Proceedings of  the Second International Conference on X-ray diffraction methods , Primorsko, Bulgaria, 1985, p.90-99.

1. V. Petkov and M. Mikhov, "Magnetic phase diagram of the MnAs spin system: a computer simulation", J. Phys. C (Solid State Physics) 18 (1985) 3791. 

II. Recen Talks and Seminars

2008 IUCr General Assembly (Osaka, talk)

2008 X-ray Denver Conference ( Denver , Conference co-organizer, invited talk)    
 
2008 Conference on nanostructure perovskites ( Genoa , invited talk)

2008 Summer workshop on materials for energy applications (MSU, invited talk)

2008 APS March Meeting ( New Orleans ; talk)  

2007 Department of Chemistry and Biochemistry, U. Texas, Austin : seminar)

2007 Workshop on high-energy diffraction ( Grenoble , France , talk)

2007 Materials Science and Technology Conference, Detroit (talk)

2007 Denver X-ray Conference (2 invited talks, and 1 workshop organized) 

2007 NSTI Conference, Santa Clara (talk)  

2007 MANSE meeting, Oakland University (talk)

2007 Spring MRS Meeting, San Francisco , (talk)

2007 Aquinas College , Gr. Rapids (seminar)

2007 Lehigh University , Bethlehem (seminar)

2006 Pittsburgh Diffraction Conference (invited talk)

2006 Non-crystalline Materials Conference (NCM10, Prague, talk)

2006 Denver X-ray Conference (talk)

2006 South Carolina University Nanoscience Center (seminar)

2006 Advanced Photon Source Users Meeting  (poster, Chicago)

2006 American Physical Society March Meeting (poster,  Baltimore)

2005 Physics Department, Oakland University (seminar)
 
2005 IDS-4 Conference (talk, Central Michigan University)

2005 American Physical Society March Meeting (poster, Los Angeles)

2004 Workshop on structure of nanocrystals (talk, Arizona State University)

2004 Physics Department, Brookhaven National Laboratory (seminar)

2004 Center for Nanoscale Materials, Argonne National Laboratory (invited talk)

2004 American Crystallographic Association Meeting, Chicago (poster presentation)

2004 Nanotech 2004 Conference Venue, Boston (poster presentation)

2003 The American Ceramic Society (Glass and Optical Materials Division) Fall meeting,
         Corning, NY (invited talk)

2003 Denver X-ray Conference, Denver (contributed talk)

2003 “Frontiers of powder diffraction”, NSLS (Brookhaven) User’s Meeting: (invited talk)

2003 American Physical Society, March Meeting, Austin, TX (contributed talk)

2003 Wayne State University (seminar)

2002 Denver X-ray Conference (contributed talk) 

2002 General Assembly (XIX) of the International Union of Crystallography, Geneva, Switzerland:
         Microsymposium: Amorphous materials and glasses; (Symposium Organizer and Chair)

2002 Meeting of the American Crystallographic Association, San Antonio (Invited talk: nanocrystallinematerials)

2002 Western Kentucky University (seminar)

2002 Central Michigan University (seminar)

2001 Cornell High Energy Synchrotron Users' Meeting: (Invited talk)

2001 Stanford Synchrotron Radiation Laboratory Users' Meeting: (Invited talk)

2001 From Semiconductors to Proteins: Beyond the Average Structure, Conference held in Traverse City, Michigan, (Conference Organizer & invited talk)

2001 Workshop in high energy x-ray scattering, Advanced Photon Source, Argonne National
         Laboratory(invited talk)

2001 Spring Meeting of the Materials Research Society (San Francisco) (invited talk)

2001 California State University, San Jose (seminar)

2001 University of Texas, El Paso (seminar)

2001 University of Southern Illinois, Edwardsville (seminar)

2000 European Synchrotron Radiation Facility (Grenoble, France) (invited talk)

2000 Eight Conference on the Structure of Non-Crystalline Materials, Aberystwyth, England

2000 American Physical Society, March Meeting

III. Research Reports:

11. V. Petkov, Simon J.L. Billinge, Sarvjit D. Shastri and Diandra Leslie-Pelecky, "Structure of GdAl2 nanomagnets by high energy x-ray diffraction" Advance Photon Source User Activity Report  Argonne, (2001).

10. V. Petkov, S.J.L. Billinge, J. Dye and .T. Vogt “Local structure of silica zeolite ITQ-4 loaded with Cs"   Brookhaven  Laboratory User Activity Report , Brookhaven, (2001).

9. V. Petkov, S.J.L. Billinge, S, Shastri and S. Rios, “Local structure of radiation damaged ZrSiO4"  Advanced Photon Source Laboratory User Activity Report, Argonne, (2000).

8. V. Petkov, S.J.L. Billinge, S, Shastri and E. Bychkov, “Local structure of xAs2S3.(1-x)Ag2S glasses" Advanced Photon Source Laboratory User Activity Report, Argonne, (2000).

7. S.J.L. Billinge, V. Petkov and Th. Proffen, "Structure on different length scales from powder diffraction: the real-space pair distribution function (PDF) technique", Commission on Powder Diffraction of the International Union of Crystallography Newsletter N: 24 , (2000).

6. V. Petkov, I-K. Jeong, M. Gutmann, P.F. Peterson, S.J.L. Billinge, S, Shastri and B. Himmel, “High resolution atomic pair distribution functions of Cax/2AlxSi1-xO2 glasses by high energy x-ray  diffraction; Advanced Photon Source Laboratory User Activity Report, Argonne, (1999).

5. O. Stachs, V. Petkov and Th. Gerber, “Structural studies of rubidium germanate glasses”, HASYLab  Synchrotron Laboratory Annual Reports, Hamburg, (1998) 750.

4. V. Petkov, O. Stachs and Th.Gerber, “WAXS study on xGa2O3(100-x).TeO2 glasses (x = 10,17.5,25),  HASYLab Synchrotron Laboratory Annual Reports , Hamburg, (1998) 752.

3. O. Stachs, V. Petkov, B. Himmel, Th. Gerber, A. Bienenstock and S. Brenan, "Short-range structure of ZrO-SiO xerogels", Stanford Synchrotron Laboratory Annual Reports , Stanford (1996), 175.

2. O. Stachs, V. Petkov, Th. Gerber and D. Novikov, "Wide-angle X-ray scattering from Ca- Al-Silicate,  GexAs40-xSe60 glasses (x=19,32) and Al-Si xerogels, HASYLab Synchrotron Laboratory Annual  Reports,  Hamburg, (1995) Part 2. p. 307.

1. S. Takeda, H. Ogawa, K. Omote and V. Petkov , "X-ray diffcation and EXAFS studies on high  temperature melts", ERATO Symposia'92, Tokyo, Japan, Part 4. p. 35 .

IV. Patents:

1. V. Petkov and &. Bulgarian Patent N 37898, May 11, 1984, "Method for preparation of monophase
    crystals of transition metal-cobalt hydrocsonitrates".