Prof. Dr. Vladimir Sepelak

Profile

Academic positionFull Professor
Research fieldsSolid State Chemistry and Surface Chemistry, Material Synthesis,Spectroscopy
KeywordsMechanochemie, Nanokristalline Materialien, Oxidspinelle, Thermische Stabilität, Struktur-Eigenschaftsbeziehungen

Current contact address

CountryGermany
CityEggenstein-Leopoldshafen
InstitutionKarlsruher Institut für Technologie (KIT)
InstituteInstitut für Nanotechnologie (INT)

Host during sponsorship

Prof. Dr. Klaus Dieter BeckerInstitut für Physikalische und Theoretische Chemie, Technische Universität Carolo-Wilhelmina zu Braunschweig, Braunschweig
Start of initial sponsorship01/06/1998

Programme(s)

1997Humboldt Research Fellowship Programme

Publications (partial selection)

2010V. Sepelak, I. Bergmann, S. Indris, A. Feldhoff, P. Heitjans, K. D. Becker: Mechanically induced changes in local structure of spinel oxides studied by spectroscopic methods. In: F. Delogu, G. Mulas, Experimental and Theoretical Studies in Modern Mechanochemistry. Transworld Research Network, 2010. 191-206
2010A. Ghasemi, V. Sepelak, X. Liu, A. Morisako: Mössbauer spectroscopy and magnetic susceptibility studies of Cr–Al substituted strontium ferrite particles. In: Journal of Applied Physics, 2010, 09A743-1-09A743-3
2010A. Ghasemi, V. Sepelak, X. Liu, A. Morisako: The role of cations distribution on magnetic and reflection loss properties of ferrimagnetic SrFe12−x(Sn0.5Zn0.5)xO19. In: Journal of Applied Physics, 2010, 09A734-1-09A734-3
2009V. Sepelak, K. D. Becker, I. Bergmann, S. Suzuki, S. Indris, A. Feldhoff, P. Heitjans, C. P. Grey: A one-step mechanochemical route to core-shell Ca2SnO4 nanoparticles followed by 119Sn MAS NMR and 119Sn Mössbauer spectroscopy. In: Chemistry of Materials, 2009, 2518-2524
2009A. Feldhoff, J. Martynczuk, M. Arnold, M. Myndyk, I. Bergmann, V. Sepelak, W. Gruner, U. Vogt, A. Hähnel, J. Woltersdorf: Spin-state transition of iron in (Ba0.5Sr0.5)(Fe0.8Zn0.2)O3-d perovskite. In: Journal of Solid State Chemistry, 2009, 2961-2971
2008V. Sepelak, I. Bergmann, A. Diekmann, P. Heitjans, K. D. Becker: Mechanosynthesis of nanocrystalline iron germanate Fe2GeO4 with a nonequilibrium cation distribution. In: Reviews on Advanced Materials Science, 2008, 349-352
2008I. Bergmann, V. Sepelak, A. Feldhoff, P. Heitjans, K. D. Becker: Particle size dependent cation distribution in lithium ferrite spinel LiFe5O8. In: Reviews on Advanced Materials Science, 2008, 375-378
2007V. Sepelak, S. Indris, P. Heitjans, K. D. Becker: Direct determination of the cation disorder in nanoscale spinels by NMR, XPS, and Mössbauer spectroscopy. In: Journal of Alloys and Compounds, 2007, 776-778
2007V. Sepelak, I. Bergmann, D. Menzel, A. Feldhoff, P. Heitjans, F. J. Litterst, K. D. Becker: Magnetization enhancement in nanosized MgFe2O4 prepared by mechanosynthesis. In: Journal of Magnetism and Magnetic Materials, 2007, e764-e767
2007V. Sepelak, I. Bergmann, A. Feldhoff, P. Heitjans, F. Krumeich, D. Menzel, F. J. Litterst, S. J. Campbell, K. D. Becker: Nanocrystalline nickel ferrite, NiFe2O4: mechanosynthesis, nonequilibrium cation distribution, canted spin arrangement, and magnetic behavior. In: Journal of Physical Chemistry C, 2007, 5026-5033
2007V. Sepelak, P. Heitjans, K. D. Becker: Nanoscale spinel ferrites prepared by mechanochemical route: Thermal stability and size dependent magnetic properties. In: Journal of Thermal Analysis and Calorimetry, 2007, 93-97
2006V. Sepelak, S. Indris, I. Bergmann, A. Feldhoff, K. D. Becker, P. Heitjans: Nonequilibrium Cation Distribution in Nanocrystalline MgAl2O4 Spinel Studied by 27Al Magic-Angle Spinning NMR. In: Solid State Ionics, 2006, 2487-2490
2006V. Sepelak, A. Feldhoff, P. Heitjans, F. Krumeich, D. Menzel, F. J. Litterst, I. Bergmann, K. D. Becker: Nonequilibrium Cation Distribution, Canted Spin Arrangement, and Enhanced Magnetization in Nanosized MgFe2O4 Prepared by a One-Step Mechanochemical Route. In: Chemistry of Materials, 2006, 3057-3067
2006I. Bergmann, V. Sepelak, K. D. Becker: Preparation of nanoscale MgFe2O4 via non-conventional mechanochemical route. In: Solid State Ionics, 2006, 1865-1868
2005Stephan Kipp, Vladimir Sepelak, Klaus Dieter Becker: Chemie mit dem Hammer - Mechanochemie. In: Chemie in Unserer Zeit, 2005, 384-392
2005V. Sepelak, I. Bergmann, A. Feldhoff, P. Heitjans, F. J. Litterst, K. D. Becker: Mechanosynthesis of spinel ferrite nanoparticles followed by Mössbauer spectroscopy. In: Hyperfine Interactions, 2005, 81-87
2005V. Sepelak, I. Bergmann, S. Kipp, K. D. Becker: Nanocrystalline Ferrites Prepared by Mechanical Activation and Mechanosynthesis. In: Z. Anorg. Allg. Chem., 2005, 993-1003
2004V. Sepelak, K. D. Becker: Comparison of the Cation Inversion Parameter of the Nanoscale Milled Spinel Ferrites with that of the Quenched Bulk Materials. In: Mater. Sci. Eng. A, 2004, 861-864
2004V. Sepelak, K. D. Becker, Z. A. Munir (Editors): Mechanochemistry and Mechanical Alloying 2003. In: Journal of Materials Science, 2004, 4983-5622
2004L. Takacs, V. Sepelak: Quantitative Comparison of the Efficiency of Mechanochemical Reactors. In: J. Mater. Sci., 2004, 5487-5489
2004Vladimir Sepelak, Marcus Menzel, Ingo Bergmann, Michael Wiebcke, Frank Krumeich, Klaus Dieter Becker: Structural and magnetic properties of nanosize mechanosynthesized nickel ferrite. In: Journal of Magnetism and Magnetic Materials, 2004, 1616-1618
2004V. Sepelak, L. Wilde, U. Steinike, K. D. Becker: Thermal Sability of the Non-Equilibrium Cation Distribution in Nanocrystalline High-Energy Milled Spinel Ferrite. In: Mater. Sci. Eng. A, 2004, 865-868
2003V. Sepelak, D. Baabe, D. Mienert, F. J. Litterst, K. D. Becker: Enhanced Magnetisation in Nanocrystalline High-Energy Milled MgFe2O4.. In: Scripta Materialia, 2003, 961-966
2003V. Sepelak, D. Baabe, D. Mienert, D. Schultze, F. Krumeich, F. J. Litterst, K. D. Becker: Evolution of Structure and Magnetic Properties with Annealing Temperature in Nanoscale High-Energy-Milled Nickel Ferrite.. In: J. Magn. Magn. Mater., 2003, 377-386
2003V. Sepelak, K. D. Becker: Homogeneous Reactions in Spinels Induced by High-Energy Milling.. In: Solid State Phenomena, 2003, 109-114
2003V. Sepelak, M. Menzel, K. D. Becker: Mössbauer Studies in Mechanochemistry.. In: Journal of Metastable and Nanocrystalline Materials, 2003, 537-544
2002V. Sepelak, M. Menzel, K. D. Becker, F. Krumeich: Mechanochemical Reduction of Magnesium Ferrite.. In: J. Phys. Chem. B, 2002, 6672-6678
2002V. Sepelak: Nanocrystalline Materials Prepared by Homogeneous and Heterogeneous Mechanochemical Reactions.. In: Ann. Chim. Sci. Mat., 2002, 61-76
2002V. Sepelak, D. Mienert, D. Baabe, P. Petrovic, K. D. Becker Superparamagnetism and Collective Magnetic Excitations in Nanoscale Milled Spinel Ferrite.. In: Czechoslovak Journal of Physics. Supplement A, 2002, A93-A96
2001V. Sepelak, D. Schultze, F. Krumreich, U. Steinike, K. D. Becker: Mechanically Induced Cation Redistribution in Magnesium Ferrite and Its Thermal Stability.. In: Solid State Ionics, 2001, 677-682
2001M. Menzel, V. Sepelak, K. D. Becker: Mechanochemical Reduction of Nickel Ferrite.. In: Solid State Ionics, 2001, 663-669
2000V. Sepelak, D. Baabe, F. J. Litterst, K. D. Becker: A Mössbauer Study of Mechanically Activated MgFe2O4.. In: Hyperfine Interactions, 2000, 143-147
2000V. Sepelak, D. Baabe, K. D. Becker: Mechanically Induced Cation Redistribution and Spin Canting in Nickel Ferrite.. In: Journal of Materials Synthesis and Processing, 2000, 333-337
2000V. Sepelak, K. D. Becker: Mechanically Induced Disorder in Magnesium Ferrite.. In: Mater. Sci. Forum, 2000, 332-337
2000V. Sepelak, M. Menzel, K. D. Becker: Mechanochemical Reaction in Spinel Ferrite.. In: Acta Montanistica Slovaca, 2000, 274-278
2000V. Sepelak, K. D. Becker: Mössbauer Studies in the Mechanochemistry of Spinel Ferrites.. In: Journal of Materials Synthesis and Processing, 2000, 155-166
2000V. Sepelak, D. Baabe, F. J. Litterst, K. D. Becker: Structural Disorder in the High-Energy Milled Magnesium Ferrite.. In: J. Appl. Phys., 2000, 5884-5893
2000V. Sepelak, U. Steinike, D. C. Uecker, K. D. Becker: Structural Response of Nanoscale Mechanosynthesized Zinc Ferrite to Changes in Temperature.. In: Mater. Sci. Forum, 2000, 357-362
1999V. Sepelak, L. Wilde, U. Steinike, K. D. Becker: Kinetics of Reordering in Mechanically Treated Spinel Ferrites: An In Situ XRD Study.. In: Zeitschrift für Kristallographie, Supplement Issue, 1999, 152-152
1999V. Sepelak, S. Wißmann, K. D. Becker: Magnetism of Nanostructured Mechanically Activated and Mechanosynthesized Spinel Ferrites.. In: J. Magn. Magn. Mater., 1999, 135-137
1999P. Druska, U. Steinike, V. Sepelak: Surface Structure of Mechanically Activated and of Mechanosynthesized Zinc Ferrite.. In: J. Solid State Chem., 1999, 13-21