个人简介

BS, MS, DEA: University of Yaounde I, Yaounde, Cameroon (1996, 1998, 1999) Ph.D. (Dr.rer.nat.): Dresden University of Technology, Dresden, Germany (2003) Postdoc and Habilitation (Priv.-Doz.): RWTH Aachen University, Aachen, Germany (2004-2010) 2011-2015 Heisenberg Fellow 2014-2015 Visiting Professor, UC Los Angeles 2012 Visiting Scientist, Cornell University 2011 Visiting Scientist, Auckland University 2004-2006 Postdoctoral Fellow, German Research Foundation

研究领域

Inorganic Chemistry/Materials Chemistry/Computational Chemistry

The Fokwa research group is interested in novel inorganic solids derived from the combination of main group elements (mainly boron), and metals (mainly transition metals). Much emphasis lies on the elucidation of the crystal and electronic structures as well as structure-bonding-property correlations of such new compounds, thus enabling their possible applications as materials for energy applications (magnetic, magnetocaloric, superconducting and spintronic materials) as well as refractory materials (hard and superhard materials). Hence, a variety of solid state synthetic methods as well as state of the art analytical and computational methods (mainly DFT) are commonly applied in a synergistic manner to achieve these goals. The Fokwa research group is interested in novel inorganic solids derived from the combination of main group elements (mainly boron), and metals (mainly transition metals). Much emphasis lies on the elucidation of the crystal and electronic structures as well as structure-bonding-property correlations of such new compounds, thus enabling their potential applications as materials for energy related technologies (magnetic, magnetocaloric, superconducting and spintronic materials) as well as refractory materials (hard and superhard materials). Hence, a variety of solid state synthetic methods as well as state of the art analytical and computational methods (mainly DFT) are commonly applied in a synergistic manner to achieve these goals. Students and Postdoc positions are available in the following research areas (experiments and computation): Rare-earth-free high energy density magnetic materials Multifunctional materials based on the Bn (n ≥ 2) building blocks Micro- and nano materials as electrocatalysts Novel Hard and super hard Materials

近期论文

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M. Mbarki, R. St. Touzani, B. P. T. Fokwa: Unexpected Synergy between Magnetic Iron Chains and Stacked B6 Rings in Nb6Fe1−xIr6+xB8, Angew.Chem. 2014, DOI: 10.1002/anie.201406397 . J. Nenwa, P. L. Djonwouo, E. N. Nfor, M. M. Bélombé, E. Jeanneau, M. Mbarki, B. P. T. Fokwa: A Dimeric Copper(II) Complex of Oxalate and Oxamide Dioxime Ligands: Synthesis, Crystal Structure, Thermal Stability, and Magnetic Properties, Z. Naturforsch. 2014, DOI:10.5560/ZNB.2014-3309. I. M. Ndassa, B. P. T. Fokwa: Site Preference and Magnetic Orderings in the Intermetallic Boride Series M1.5Rh5.5B3 (M= Cr, Mn, Fe, Co, Ni) from First Principles DFT Calculations, Comp. Mater. Sci. 2014, DOI: 10.1016/j.commatsci.2014.05.054. M. Hermus, B. P. T. Fokwa: Experimental and First-Principles Studies of the Ternary Borides Ta3Ru5B2 and M3–xRu5+xB2 (M = Zr, Hf), Eur. J. Inorg. Chem. 2014, DOI:10.1002/ejic.201402206. M. Hermus, M. Yang, D. Grüner, F. J. DiSalvo, B. P. T. Fokwa: Drastic Change of Magnetic Interactions and Hysteresis through Site-Preferential Ru/Ir Substitution in Sc2FeRu5–xIrxB2, Chem. Mater. 2014, DOI: 10.1021/cm500237h. O. Niehaus, U. Ch. Rodewald, P. M. Abdala, R. St. Touzani, B. P. T. Fokwa, O. Janka: Synthesis and Theoretical Investigations of the Solid Solution CeRu1–xNixAl (x = 0.1–0.95) Showing Cerium Valence Fluctuations, Inorg.Chem. 2014, DOI: 10.1021/ic402414f. M. Mbarki, R. St. Touzani, B. P. T. Fokwa: Experimental and Theoretical Investigations of the Ternary Boride NbRuB with a Layerlike Structure Type, Eur. J. Inorg.Chem. 2014, DOI: 10.1002/ejic.201301488 . R. St. Touzani, B. P. T. Fokwa: Electronic, Structural and Magnetic Studies of Niobium Borides of Group 8 Transition Metals, Nb2MB2 (M = Fe, Ru, Os) from first principles calculations, J. Solid State Chem. 2013, DOI: 10.1016/j.jssc.2013.10.013. C. Goerens, J. Brgoch, G. J. Miller, B. P. T. Fokwa: Scaffolds of Magnetically Active 3d Metals in the Valence Electron Controlled Borides Ti9-xM2+xRu18B8 (M = Cr - Ni; x = 0.5 - 1): Structural, Electronic and Magnetic Properties, J. Solid State Chem. 2013, DOI: 10.1016/j.jssc.2013.05.040. M. Mbarki, R. St. Touzani, B. P. T. Fokwa: Nb2OsB2 with a New Twofold Superstructure of the U3Si2 Type: Synthesis, Crystal Chemistry and Chemical Bonding, J. Solid State Chem. 2013, DOI: 10.1016/j.jssc.2013.04.018. I. M. Ndassa, M. Gillessen, B. P. T. Fokwa: Electronic Structure, Chemical Bonding and Magnetism of the Metal-Rich Borides MRh6B3 (M = Cr, Mn, Fe, Co, Ni) with Th7Fe3-Type Structure: A Density Functional Theory Study, Solid State Sciences, 2013, 17, 14. C. Goerens, B. P. T. Fokwa: V1+xNb1–xIrB2 (x ≈ 0.1), The First Quaternary Metal-Rich Boride Adopting The Mo2IrB2-Type Structure: Synthesis, Crystal and Electronic Structure and Bonding Analysis, Z. Anorg. Allg. Chem., 2013, DOI: 10.1002/zaac.201200439. Highlighted in Nachrichten aus der Chemie (03/2014). B. Gouet, M. Signé, J. Nenwa, M. Mbarki, B. P. T. Fokwa: Pyridinium trans-diaquabis [oxalato(2−)-κ2O1,O2]chromate(III) urea monosolvate, Acta Cryst., 2013, E69, m567, DOI: 10.1107/S1600536813026135. B. Gouet, M. Signé, J. Nenwa, M. Mbarki, B. P. T. Fokwa: Synthesis, crystal structure and spectroscopic characterization of an oxalato bridged silver-deficient chromium(III) salt with water-filled nanochannels, Res. J. Chem. Environ. 2013, 17, 57. B. Gouet, I. M. Ndassa, P. R. Ndong, P. R. N. Misse, B. P. T. Fokwa: Crystal structure of potassium trans-diaquabis[oxalato-k2O,O] chromate(III) urea disolvate, K[Cr(C2O4)2(H2O)2]·2CO(NH2)2, C6H12CrKN4O12, Z. Kristallogr. NCS 2013, DOI:10.1524/ncrs.2013.0069. B. P. T. Fokwa, M. Hermus: All-Boron Planar B6 Ring in the Solid State Phase Ti7Rh4Ir2B8, Angew. Chem. 2012, DOI: 10.1002/ange.201106798 and Angew. Chem. Int. Ed. 2012, DOI: 10.1002/anie.201106798. Highlighted in Chemical and Engineering News (02/2012). M. Hermus, B. P. T. Fokwa: Competing Electronic and Size Effects When Substituting 3d Elements for Nb in Nb3Ru5B2 En Route to the Quaternary Phases (Nb2–xScx)4Nb2Ru5B2 (1 ≤ x < 2), Nb3–xMxRu5B2 (M = Ti, V; x ≈ 1), and Nb2+xM1–xRu5B2 (M = Cr, Mn, Fe, Co, Ni; 0 < x ≤ 0.5), Eur. J. Inorg. Chem. 2012, DOI: 10.1002/ejic.201200627. C. Goerens, B. P. T. Fokwa: The complex metal-rich boride Ti1+xRh2−x+yIr3−yB3 (x=0.68, y=1.06) with a new structure type containing B4 zigzag fragments: Synthesis, crystal chemistry and theoretical calculations, J. Solid State Chem. 2012, DOI: 10.1016/j.jssc.2012.04.005. P. R. N. Misse, M. Mbarki, B. P. T. Fokwa: Synthesis, crystal structure investigation and magnetism of the complex boride series Crx(Rh1−yRuy)7−xB3 (x=0.88 − 1, y = 0 − 1) with Th7Fe3−type structure, J. Solid State Chem., 2012, DOI: 10.1016/j.jssc.2012.04.041. V. L. Deringer, C. Goerens, M. Esters, R. Dronskowski, B. P. T. Fokwa: Chemical Modeling of Mixed Occupations and Site Preferences in Anisotropic Crystal Structures: Case of Complex Intermetallic Borides. Inorg. Chem. 2012, DOI: 10.1021/ic300023t. Highlighted in Nachrichten aus der Chemie (03/2013).