scholarly journals NaBeAs(Sb) – Ternäre Phasen im „aufgefüllten“ NiAs(Ni2In)-Typ / NaBeAs(Sb) – Ternary Phases in a „Filled“ NiAs(Ni2In)-Structure

1977 ◽  
Vol 32 (10) ◽  
pp. 1133-1138 ◽  
Author(s):  
Christoph Tiburtius ◽  
Hans-Uwe Schuster
Keyword(s):  
Single Crystal ◽  
Structure Determination ◽  
Type Structure ◽  
Crystal Data ◽  
Space Group ◽  
Lattice Constants ◽  
Structure Space

NaBeAs and NaBeSb crystallize in a modified Ni2In-type-structure, space group P 63/mmc–D6h4. Preparation and structure determination with powder and single crystal data are described. The bonds and the structure are discussed in comparison with corresponding compounds of the formula AMeIIX. The lattice constants are:NaBeAs: α = 3,820(5), c = 8,948(9), c/α = 2,34;NaBeSb: α = 4,144(5), c = 9,320(9), c/α = 2,25.

scholarly journals Struktur- und Phasenübergangsuntersuchungen an β-Li2ZnGe/ Structure and Phase Transition Investigations on β-Li2ZnGe

1981 ◽  
Vol 36 (8) ◽  
pp. 917-921 ◽  
Author(s):  
Hans-Otto Cullmann ◽  
Heinz-Walter Hinterkeuser ◽  
Hans-Uwe Schuster
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Single Crystal ◽  
Ternary Compound ◽  
Type Structure ◽  
Crystal Data ◽  
Space Group ◽  
Cell Parameters ◽  
Structure Space

Abstract The ternary compound β-Li2ZnGe was prepared and its structure determined from powder and single crystal data. The compound crystallizes in a modified Na3As type structure, space group Ṗ̇̇̇̇̇̇̇̇̇̇̇̇̇̇3̄m 1 - D33d.The cell parameters are: a = 432.6 pm, c = 1647.0 pm, c/a= 3.83.A phase transition between a-and β-Li2ZnGe was found and the reaction of the elements lithium, zinc and germanium to a-Li2ZnGe was followed by differential thermal analysis. The temperatures and the enthalpies of transition and fusion were determined.

KHgAs (Sb) und KZnAs - Ternäre Verbindungen mit modifizierter Ni2In-Struktur/ KHgAs (Sb) and KZnAs - Ternary Compounds in a Modified Ni2In-Structure

1980 ◽  
Vol 35 (1) ◽  
pp. 114-116 ◽  
Author(s):  
Rainer Vogel ◽  
Hans-Uwe Schuster
Keyword(s):  
Single Crystal ◽  
Type Structure ◽  
Crystal Data ◽  
Space Group ◽  
Cell Parameters ◽  
Ternary Compounds ◽  
Structure Space

The compounds KHgAs, KHgSb and KZnAs were prepared and their structures determined by powder and single crystal data. The compounds crystallize in a modified Ni2In-type structure, space group P63/mmc-D46h. The cell parameters are: KHgAs a = 450.6pm, c = 997.6pm, c/a = 2.21; KHgSb a = 478.4pm, c = 1022.5pm, c/a = 2.14; KZnAs a = 423.0pm, c = 1023.4pm, c/a = 2.42.

NaMgAs(Sb) -Ternäre Verbindungen mit modifizierter Cu2Sb-Struktur / NaMgAs(Sb) -Ternary Compounds in a Modified Cu2Sb Structure

1978 ◽  
Vol 33 (10) ◽  
pp. 1080-1082 ◽  
Author(s):  
Burkhard Krenkel ◽  
Hans-Uwe Schuster
Keyword(s):  
Single Crystal ◽  
Type Structure ◽  
Crystal Data ◽  
Space Group ◽  
Cell Parameters ◽  
Ternary Compounds ◽  
Structure Space

Abstract The compounds NaMgAs and NaMgSb were prepared and their structures determined by powder and single crystal data. NaMgAs and NaMgSb crystallize in a modified Cu2Sb-type-structure, space group P4/nmm-D74h. The cell parameters for the tetragonal com-pounds are:

Neue elektrovalente ternäre Verbindungen des Kaliums mit Magnesium und Elementen der 5. Hauptgruppe / New Ternary Compounds of Potassium with Magnesium and Elements of the 5. Main Group

1979 ◽  
Vol 34 (12) ◽  
pp. 1719-1721 ◽  
Author(s):  
Rainer Vogel ◽  
Hans-Uwe Schuster
Keyword(s):  
Single Crystal ◽  
Main Group ◽  
Type Structure ◽  
Crystal Data ◽  
Space Group ◽  
Cell Parameters ◽  
Ternary Compounds ◽  
Structure Space

Ternary Potassium Compounds, Crystal Data The compounds KMgP, KMgAs, KMgSb and KMgBi were prepared and their structures determined by powder and single crystal data. The compounds crystallize in a modified Cu2Sb type structure, space group P4/nmm-D4h7. The cell parameters are:KMgP: a = 444,6pm, c = 754,4pm, c/a = 1,69,KMgAs: a = 454,6pm, c = 771,6pm, c/a = 1,69,KMgSb: a = 481,2 pm, c = 820,2 pm, c/a = 1,70,KMgBi: a = 488,1 pm, c = 838,2 pm, c/a = 1,72.

CaPtIn4 – an intergrowth variant of CaPtIn2 and indium slabs

2019 ◽  
Vol 74 (9) ◽  
pp. 693-698 ◽  
Author(s):  
Birgit Heying ◽  
Jutta Kösters ◽  
Rainer Pöttgen
Keyword(s):  
Intermetallic Compound ◽  
Single Crystal ◽  
Peritectic Reaction ◽  
Three Dimensional ◽  
Type Structure ◽  
Space Group ◽  
X Ray ◽  
Structure Space ◽  
Indium Metal

AbstractThe indium-rich intermetallic compound CaPtIn4 is formed in a peritectic reaction of CaPtIn2 and indium metal at T = 670 K (14 days annealing). CaPtIn4 crystallizes with the YNiAl4-type structure, space group Cmcm, which was refined from single crystal X-ray diffractometer data: a = 446.3(5), b = 1659.50(18), c = 756.8(8) pm, wR2 = 0.0646, 640 F2 values and 24 variables. Geometrically one can describe the CaPtIn4 structure as an intergrowth variant of CaPtIn2 (MgCuAl2 type) and indium slabs. The three-dimensional [PtIn4] polyanionic network shows short Pt–In distances of 269–280 pm and a broader range of In–In distances (304–378 pm) within substantially distorted In@In8 cubes.

Intermediate-valent Ce23Ru7Mg4 and RE23Ru7Mg4 (RE = La, Pr, Nd) with Pr23Ir7Mg4-type Structure

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1345-1352 ◽  
Author(s):  
Stefan Linsinger ◽  
Matthias Eul ◽  
Wilfried Hermes ◽  
Rolf-Dieter Hoffmann ◽  
Rainer Pöttgen
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Single Crystal ◽  
Magnetic Moment ◽  
Induction Furnace ◽  
Type Structure ◽  
Space Group ◽  
Structure Space ◽  
Magnesium Compounds ◽  
Intermediate Valent

The rare earth-rich magnesium compounds RE23Ru7Mg4 (RE = La, Ce, Pr, Nd) were synthesized from the elements in sealed tantalum ampoules in an induction furnace. They crystallize with the hexagonal non-centrosymmetric Pr23Ir7Mg4-type structure, space group P63mc. The structures of La23Ru6.88(1)Mg4 (a = 1017.7(4), c = 2286.5(5) pm, wR2 = 0.0277, 2708 F2, 71 variables), Ce23Ru7Mg4 (a = 993.5(3), c = 2243.9(8) pm, wR2 = 0.0573, 2268 F2, 70 variables), and Pr23Ru7Mg4 (a = 996.8(3), c = 2241.5(6) pm, wR2 = 0.0492, 2565 F2, 70 variables) have been refined from single-crystal diffractometer data. The structures are built up from complex threedimensional networks of edge- and corner-sharing RE6Ru trigonal prisms. Cavities within these networks are filled by slightly elongated Mg4 tetrahedra (311 - 315 pm in Pr23Ru7Mg4) and RE6 octahedra. The cerium compound has an a parameter which is even smaller than that of Nd23 Ru7Mg4, indicating intermediate-valent cerium. This was confirmed by magnetic susceptibility measurements. Ce23Ru7Mg4 shows an average, reduced magnetic moment of 2.01 μB/Ce atom. Pr23Ru7Mg4 contains stable trivalent praseodymium (3.64 μB/Pr atom)

Rare Earth-rich Cadmium Compounds RE4TCd (T = Ni, Pd, Ir, Pt)

2008 ◽  
Vol 63 (9) ◽  
pp. 1127-1130 ◽  
Author(s):  
Falko M. Schappacher ◽  
Ute Ch. Rodewald ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Single Crystal ◽  
Intermetallic Compounds ◽  
Three Dimensional ◽  
Type Structure ◽  
Space Group ◽  
X Ray ◽  
Structure Space ◽  
Cadmium Compounds

New intermetallic compounds RE4TCd (RE = Y, La-Nd, Sm, Gd-Tm, Lu; T = Ni, Pd, Ir, Pt) were synthesized by melting of the elements in sealed tantalum tubes in a highfrequency furnace. They crystallize with the Gd4RhIn-type structure, space group F 4̄3m, Z = 16. The four gadolinium compounds were characterized by single crystal X-ray diffractometer data: a = 1361.7(1) pm, wR2 = 0.062, 456 F2 values, 19 variables for Gd4NiCd; a = 1382.1(2) pm, wR2 = 0.077, 451 F2 values, 19 variables for Gd4PdCd; a = 1363.6(2) pm, wR2 = 0.045, 494 F2 values, 19 variables for Gd4IrCd; a = 1379.0(1) pm, wR2 = 0.045, 448 F2 values, 19 variables for Gd4PtCd. The rare earth atoms build up transition metal-centered trigonal prisms which are condensed via common corners and edges, leading to three-dimensional adamantane-related networks. The cadmium atoms form Cd4 tetrahedra which fill voids left in the prisms’ network.

Die Verbindungen MgFe6Ge6 und LiCo6Ge6 / The Compounds MgFe6Ge6 and LiCo6Ge6

1978 ◽  
Vol 33 (8) ◽  
pp. 877-880 ◽  
Author(s):  
Werner Buchholz ◽  
Hans-Uwe Schuster
Keyword(s):  
Single Crystal ◽  
Type Structure ◽  
Space Group ◽  
Lattice Constants

The hexagonally crystallizing compounds MgFe6Ge6 and LiCo6Ge6 were prepared and structurally characterized by single crystal investigations. The lattice constants are a = 506.7 pm, c = 804.5 pm, c/a= 1.58s for MgFe6Ge6 and a = 504.8 pm, c = 772.9 pm, c/a = 1.531 for LiCo6Ge6. The structures (space group P6/mmm) are closely related to the structure of LiFe6Ge6 and the B 35-type structure of FeGe.

AB2X2-Verbindungen im CaAl2Si2-Typ, V[1] Zur Struktur der Verbindungen CaMn2P2, CaMn2As2, SrMn2P2 und SrMn2As2 / AB2X2-Compounds with the CaAl2Si2 Structure, V [1] The Crystal Structure of CaMn2P2, CaMn2As2, SrMn2P2, and SrMn2As2

1978 ◽  
Vol 33 (6) ◽  
pp. 606-609 ◽  
Author(s):  
Albrecht Mewis
Keyword(s):  
Crystal Structure ◽  
Type Structure ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants ◽  
Ternary Compounds ◽  
Structure Space ◽  
Ray Methods

Abstract Four ternary compounds with the formulas CaMn2P2, CaMn2As2, SrMn2P2, and SrMn2As2 have been prepared and investigated by X-ray methods. They are isotypic and crystallize trigonally in a CaAl2Si2-type structure (space group P3̅m 1-D33d) with the lattice constants: CaMn2P2 a = 4,096 ± 0,001 Å, c = 6,848 ± 0,002 Å, CaMn2As2 a = 4,239 ± 0,001 Å, c = 7,027 ± 0,003 Å, SrMn2P2 a = 4,168 ± 0,001 Å, c = 7,132 ± 0,001 Å, SrMn2As2 a = 4,306 ± 0,001 Å, c = 7,315 ± 0,001 Å. The lattice constants of BaMn2P2 and BaMn2As2 are given

Rh2Sb with (anti-)PbCl2-Type Structure

1990 ◽  
Vol 45 (7) ◽  
pp. 947-951 ◽  
Author(s):  
Wolfgang Jeitschko ◽  
Rainer O. Altmeyer
Keyword(s):  
Single Crystal ◽  
Crystal Chemistry ◽  
Homogeneity Range ◽  
Type Structure ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Lattice Constants ◽  
Rich Side

Crystals of Rh2Sb were prepared by sintering the elemental components in a NaCl/KCl flux. They crystallize in the orthorhombic space group Pnma with the lattice constants α = 572.1(1)-573.6(1) pm, b = 417.1(1)-418.1(1) pm, c = 792.8(2)-794.9(1) pm, V = 0.1892-0.1906 nm3 for the antimony- and rhodium-rich side, respectively, of the homogeneity range at 800 °C. The structure belongs to the Co2Si-branch of the (anti-)PbCl2-type. It was refined from single-crystal diffractometer data to a residual R = 0.059. The crystal chemistry of the various PbCl2-type compounds is briefly reviewed.

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