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Featured researches published by Dominik Kotzott.


Journal of the American Chemical Society | 2010

Synthesis, Crystal Structure, and Properties of MgxB50C8 or Mgx(B12)4(CBC)2(C2)2 (x = 2.4―4)

Volker Adasch; Melanie Schroeder; Dominik Kotzott; Thilo Ludwig; Natascha Vojteer; Harald Hillebrecht

Single crystals of a new magnesium boride carbide Mg(x)B(50)C(8) (x = 2.4-4) were synthesized from the elements in a metallic melt using tantalum ampules. Crystals were characterized by single crystal X-ray diffraction and electron microprobe analysis. The variation of the Mg content results from different reaction conditions. The composition Mg(∼3)B(50)C(8) is by far the most favored. It fulfills the electron counting rules of Wade and Longuet-Higgins and thus explains the light-green to yellow transparent color. The structure of Mg(∼3)B(50)C(8) (C2/m, Z = 1, a = 8.9384(12) Å, b = 5.6514(9) Å, c = 9.6021(13) Å, β = 105.86(1)°) consists of B(12) icosahedra. The icosahedra are interconnected by four exohedral B-B bonds to layers. The layers are connected to a three-dimensional covalent network by C(2) and CBC units and further exohedral B-B bonds. The Mg sites are partially occupied. Different site occupation factors cause the various compositions and colors (Mg(2.4)B(50)C(8), brown; Mg(4)B(50)C(8), black). The vibrational spectra show the modes of B(12) icosahedra and C(2) and CBC units as well. Measurements of the microhardness according to Vickers and Knoop revealed remarkably high values of H(V) = 3286 (32.0 GPa) and H(K) = 3165 (31.5 GPa), which exceed the values of B(4)C. Optical spectra reveal a band gap of 2.7 eV for Mg(∼3)B(50)C(8), in agreement to the observed color. This justifies an ionic description, and the formula can be written as (Mg(2+))(3)(B(12)(2-))(4)(CBC(+))(2)(C(2))(2).


Journal of Solid State Chemistry | 2009

Ti2GaC, Ti4GaC3 and Cr2GaC—Synthesis, crystal growth and structure analysis of Ga-containing MAX-phases Mn+1GaCn with M=Ti, Cr and n=1, 3

Johannes Etzkorn; Martin Ade; Dominik Kotzott; Monique Kleczek; Harald Hillebrecht


Solid State Sciences | 2008

Synthesis and crystal structures of α- and β-modifications of Cr2IrB2 containing 4-membered B4 chain fragments, the τ-boride Cr7.9Ir14.1B6 and orthorhombic Cr2B

Dominik Kotzott; Martin Ade; Harald Hillebrecht


Journal of Solid State Chemistry | 2010

Synthesis and crystal structures of the new metal-rich ternary borides Ni12AlB8, Ni12GaB8 and Ni10.6Ga0.4B6—examples for the first B5 zig-zag chain fragment

Martin Ade; Dominik Kotzott; Harald Hillebrecht


Journal of Solid State Chemistry | 2009

Single crystal studies on Co-containing τ-borides Co23−xMxB6 (M=Al, Ga, Sn, Ti, V, Ir) and the boron-rich τ-boride Co12.3Ir8.9B10.5

Dominik Kotzott; Martin Ade; Harald Hillebrecht


Journal of Solid State Chemistry | 2010

Single crystal studies on boron-rich τ-borides Ni23−xMxB6 (M=Zn, Ga, In, Sn, Ir)—The surprising occurrence of B4-tetraheda as a normal case?

Dominik Kotzott; Martin Ade; Harald Hillebrecht


Journal of Alloys and Compounds | 2010

Synthesis, crystal growth, structure, and micro-hardness of W9Al3CoC3—First single crystal studies on an ordered hexagonal κ-carbide

Dominik Kotzott; Harald Hillebrecht


Journal of Solid State Chemistry | 2010

Synthesis and crystal structures of the new metal-rich ternary borides NiAlB, NiGaB and Ni{sub 10.6}Ga{sub 0.4}B-examples for the first B zig-zag chain fragment

Martin Ade; Dominik Kotzott; Harald Hillebrecht


Journal of Solid State Chemistry | 2009

TiGaC, TiGaC and CrGaC-Synthesis, crystal growth and structure analysis of Ga-containing MAX-phases M{sub n+1}GaC{sub n} with M=Ti, Cr and n=1, 3

Johannes Etzkorn; Martin Ade; Dominik Kotzott; Monique Kleczek; Harald Hillebrecht


Journal of Solid State Chemistry | 2009

Single crystal studies on Co-containing -borides Co{sub 23-x}MB (M=Al, Ga, Sn, Ti, V, Ir) and the boron-rich -boride Co{sub 12.3}Ir{sub 8.9}B{sub 10.5}

Martin Ade; Dominik Kotzott; Harald Hillebrecht

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Martin Ade

University of Freiburg

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