Synthesis, crystal growth, and structure of Ta3Al2CoC—An ordered quarternary cubic η-carbide and the first single crystal study of a η-carbide

Etzkorn, Johannes; Hillebrecht, Harald

doi:10.1016/j.jssc.2008.02.037

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…In the course of our investigations on the synthetic potential of liquid metals and alloys for synthesis and crystal growth of ternary carbides and borides of transition metals, we have investigated the formation of group 6 borides from liquid aluminum. The focus was on single crystal syntheses for two reasons.…”

Section: Introductionmentioning

confidence: 99%

Ternary Borides Cr₂AlB₂, Cr₃AlB₄, and Cr₄AlB₆: The First Members of the Series (CrB₂)_nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases

2015

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Single crystals of the ternary borides Cr2AlB2, Cr3AlB4, Cr4AlB6, MoAlB, WAlB, Mn2AlB2, and Fe2AlB2 were grown from the elements with an excess of Al. Structures were refined by X-ray methods on the basis of single crystal data. All compounds crystallize in orthorhombic space groups. In each case boron atoms show the typical trigonal prisms BM6. The BM6-units are linked by common rectangular faces forming B-B-bonds. Thus, zigzag chains of boron atoms are obtained for MoAlB, WAlB, and M2AlB2 (M = Cr, Mn, Fe); chains of hexagons for Cr3AlB4; and double chains of hexagons for Cr4AlB6. The same subunits are known for the binary borides CrB, Cr3B4, Cr2B3, and β-WB, too. The boride partial structures are separated by single layers of Al-atoms in the case of the chromium compounds and double layers for WAlB, i.e., W2Al2B2. All crystal structures can be described using a unified building set principle with quadratic 4(4)-nets of metal atoms. The different compositions and crystal structures are obtained by different numbers of metal layers in the corresponding parts according to the formula (MB)2Aly(MB2)x. This principle is an extension of a scheme which was developed for the boridecarbides of niobium. Furthermore, there is a close similarity to the group of ternary carbides MAl(MC)n, so-called MAX-phases. Therefore, they might be named as "MAB-phases". The pronounced two-dimensionality and the mixture of strong covalent and metallic interactions make MAB-phases to promising candidates for interesting material properties. All compositions were confirmed by EDX measurements. Additionally, microhardness measurements were performed.

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Section: Introductionmentioning

confidence: 99%

Ternary Borides Cr₂AlB₂, Cr₃AlB₄, and Cr₄AlB₆: The First Members of the Series (CrB₂)_nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases

2015

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“…The use of Co/Al mixtures enabled single crystal growth and characterisation of new ternary carbides like V 4 AlC 3−x and V 12 Al 3 C 8 [20]. A surprising result was the formation of single crystals of the quaternary -carbide Ta 3 Al 2 CoC [22]. Now we continue the series of single crystal investigations of transition metal carbides with the first investigation on a -carbide, W 9 Al 3 CoC 3 .…”

Section: Introductionmentioning

confidence: 92%

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

Kotzott

Hillebrecht

2010

Journal of Alloys and Compounds

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“…The most distinguished feature of the Ti 2 Ni-type structure is a rich variety of interstitial sites available for small atoms of the elements like H, C, N, O. Since Westgren's first determination of the so called η-carbide structure W 3 Fe 3 C (filled up derivative of Ti 2 Ni with C in [W 6 ] octahedral voids (16d, 1 2 , 1 2 , 1 2 )), 2 innumerable examples of phases containing two or more transition metals and carbon, [3][4][5][6][7][8][9][10][11] nitrogen [12][13][14][15] or oxygen [16][17][18][19][20][21] have been observed including fully ordered quaternary examples such as Ti 3 NiAl 2 N and others. 22 More recently, the complex Ti 2 Ni-type metal nitrides and hydrides attract a considerable attention as promising catalytic 23,24 and hydrogen storage 25,26 materials, respectively.…”

Section: Introductionmentioning

confidence: 99%

Boron induced structure modifications in Pd–Cu–B system: new Ti₂Ni-type derivative borides Pd₃Cu₃B and Pd₅Cu₅B₂

et al. 2016

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The formation of two distinct derivative structures of Ti2Ni-type, interstitial Pd3Cu3B and substitutive Pd5Cu5B2, has been elucidated in Pd-Cu-B alloys from analysis of X-ray single crystal and powder diffraction data and supported by SEM. The metal atom arrangement in the new boride Pd3Cu3B (space group Fd3m, W3Fe3C-type structure, a = 1.1136(3) nm) follows the pattern of atom distribution in the CdNi-type structure. Pd5Cu5B2 (space group F(4)3m, a = 1.05273(5) nm) exhibits a non-centrosymmetric substitutive derivative of the Ti2Ni-type structure. The reduction of symmetry on passing from Ti2Ni-type structure to Pd5Cu5B2 corresponds to the loss of an inversion centre delivered by an ordered occupation of the Ni position (32e) by dissimilar atoms, Cu and B. In both structures, the boron atom centers Pd forming [BPd6] octahedra in Pd3Cu3B and [BPd6] trigonal prisms in Pd5Cu5B2. Neither a perceptible homogeneity range nor mutual solid solubility was observed for two compounds at 600 °C, while in as cast conditions Pd5Cu5B2 exhibits an extended homogeneity range formed by a partial substitution of Cu atoms (in 24f) by Pd (Pd5+xCu5-xB2, 0 ≤x≤ 1). Electrical resistivity measurements performed on Pd3Cu3B as well as on Pd-poor and Pd-rich termini of Pd5+xCu5-xB2 annealed at 600 °C and in as cast conditions respectively demonstrated the absence of any phase transitions for this compounds in the temperature region from 0.3 K to 300 K.

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Synthesis, crystal growth, and structure of Ta3Al2CoC—An ordered quarternary cubic η-carbide and the first single crystal study of a η-carbide

Cited by 5 publications

References 35 publications

Ternary Borides Cr₂AlB₂, Cr₃AlB₄, and Cr₄AlB₆: The First Members of the Series (CrB₂)_nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases

Ternary Borides Cr₂AlB₂, Cr₃AlB₄, and Cr₄AlB₆: The First Members of the Series (CrB₂)_nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases

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

Boron induced structure modifications in Pd–Cu–B system: new Ti₂Ni-type derivative borides Pd₃Cu₃B and Pd₅Cu₅B₂

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Synthesis, crystal growth, and structure of Ta3Al2CoC—An ordered quarternary cubic η-carbide and the first single crystal study of a η-carbide

Cited by 5 publications

References 35 publications

Ternary Borides Cr2AlB2, Cr3AlB4, and Cr4AlB6: The First Members of the Series (CrB2)nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases

Ternary Borides Cr2AlB2, Cr3AlB4, and Cr4AlB6: The First Members of the Series (CrB2)nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases

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

Boron induced structure modifications in Pd–Cu–B system: new Ti2Ni-type derivative borides Pd3Cu3B and Pd5Cu5B2

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Ternary Borides Cr₂AlB₂, Cr₃AlB₄, and Cr₄AlB₆: The First Members of the Series (CrB₂)_nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases

Ternary Borides Cr₂AlB₂, Cr₃AlB₄, and Cr₄AlB₆: The First Members of the Series (CrB₂)_nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases

Boron induced structure modifications in Pd–Cu–B system: new Ti₂Ni-type derivative borides Pd₃Cu₃B and Pd₅Cu₅B₂