Compounds Ln5(Ag, Ga)19 – x (Ln = Gd, Tb) – Defective Partially Ordered Representatives of the Rb5Hg19 Structure Type

2005 ◽  
Vol 60 (9) ◽  
pp. 929-932 ◽  
Author(s):  
Roman V. Gumeniuk ◽  
Lev G. Akselrud ◽  
Yurij B. Kuz’ma
Keyword(s):  
Crystal Structures ◽  
Structure Type ◽  
Space Group ◽  
X Ray ◽  
Type Space ◽  
Partially Ordered ◽  
New Compounds

New compounds Ln5(Ag, Ga)19−x (Ln = Gd, Tb) have been found to crystallise with the Rb5Hg19 structure type (space group I4/m). The crystal structures were refined for Gd5Ag1.8Ga15 and Tb5Ag2Ga15.6 from X-ray powder data: a = 9.4635(1), c = 9.8638(2) Å , RI = 0.093 and a = 9.4313(1), c = 9.8491(2) Å , RI = 0.085, respectively. Some positions in the crystal structures of new the compounds are occupied partially.

scholarly journals New Compounds RE(Zn,Al)8 and Yb4Zn20.3Al12.7 and their Crystal Structures

2006 ◽  
Vol 61 (7) ◽  
pp. 779-784 ◽  
Author(s):  
Ol’ga Stel’makhovych ◽  
Yurij Kuz’ma
Keyword(s):  
Intermetallic Compound ◽  
Crystal Structures ◽  
Structure Type ◽  
Type Structure ◽  
Space Group ◽  
X Ray ◽  
Structure Space ◽  
New Compounds ◽  
First Time ◽  
The Relationship

The crystal structures of several new compounds have been determined using X-ray analysis. The intermetallic compound HoZn5Al3 (a = 8.586(3), c = 16.538(5) Å , RF = 0.0413, RW = 0.0521) has its own structure type (space group I4/mmm), which has been found for the first time. The following compounds are isostructural with the previous one: YZn5.52Al2.48 (a = 8.6183(1), c = 16.5048(3) Å , RI = 0.078, RP = 0.116), DyZn4.96Al3.04 (a = 8.5887(1), c = 16.5002(3) Å , RI = 0.077, RP = 0.114), ErZn5.37Al2.63 (a = 8.5525(2), c =16.3997(5) Å , RI = 0.081, RP = 0.111), TmZn5.64Al2.36 (a = 8.70429(8), c = 16.3943(4) Å , RI = 0.088, RP = 0.095), LuZn5.58Al2.42 (a = 8.5616(1), c= 16.3052(3) Å , RI =0.081, RP =0.101). The intermetallic compound Yb4Zn20.3Al12.7 (a = 8.6183(1), c = 16.5048(3) Å , RI = 0.085, RP = 0.112) adopts the Yb8Cu17Al49 - type structure (space group I4/mmm). The relationship between the HoZn5Al3-type and the Yb8Cu17Al49-type structures is discussed.

AlkalineEarthMetal-Hydride-Iodide Compounds: Syntheses andCrystal Structures of Sr2H3I and Ba5H2I3.9(2)O2

2011 ◽  
Vol 66 (1) ◽  
pp. 21-26
Author(s):  
Olaf Reckeweg ◽  
Francis J. DiSalvo
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Structural Model ◽  
Structure Type ◽  
Lattice Parameters ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
New Compounds

Single crystals of Sr2H3I andBa5H2I3.9(2)O2 were obtained by reacting Sr or Ba, respectively, with dried and sublimed NH4I in a 4 : 1 molar ratio in silica-jacketed Nb ampoules for 13 h at 1200 K. The crystal structures of the new compounds have been determined by means of single-crystal X-ray diffraction. Sr2H3I crystallizes in a stuffed anti-CdI2 structure isotypic to Ba2H3Cl in the space group P3m1 (no. 164) with the lattice parameters a = 426.0(1) and c = 774.9(2) pm, while Ba5H2I3.9(2)O2 crystallizes in a new structure type in the space group Cmcm (no. 63) with the lattice parameters a = 1721.0(2), b = 1452.5(2) and c = 639.03(9) pm. The structural results for Sr2H3I are corroborated by EUTAX calculations. For the disordered compound Ba5H2I3.9(2)O2, EUTAX calculations on an approximated, ordered structural model were used to find possible insights into the disorder

Powder diffraction data of a new compound Al0.35GdGe2

2008 ◽  
Vol 23 (1) ◽  
pp. 60-62 ◽  
Author(s):  
Lingmin Zeng ◽  
Jiejun He ◽  
Pingli Qin ◽  
Xiangzhong Wei
Keyword(s):  
Ternary Compound ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Structure Type ◽  
Powder Diffraction Data ◽  
Space Group ◽  
X Ray ◽  
Type Space

A new ternary compound Al0.35GdGe2 has been synthesized and studied by means of X-ray powder diffraction technique. The ternary compound Al0.35GdGe2 crystallizes in the orthorhombicwith the CeNiSi2 structure type (space group Cmcm, a=4.0874(2) Å, b=16.1499(5) Å,c=3.9372(1) Å, Z=4, and Dcalc=8.007 g/cm3).

Synthese und Kristallstruktur von Dibariumzink-bis(cyclotriborat) Ba2Zn(B3O6)2/Synthesis and Crystal Structure of Di-barium Zinc Bis-cyclotriborate Ba2Zn(B3O6)2

1996 ◽  
Vol 51 (3) ◽  
pp. 309-312 ◽  
Author(s):  
Silke Busche ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Single Crystals ◽  
Crystal Structures ◽  
Structure Type ◽  
Lattice Parameters ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Unknown Structure

Abstract Single crystals of the new compound Ba2Zn(B3O6)2 were obtained by using a B2O3 flux technique. They crystallize in an as yet unknown structure type. X-ray investigations led to space group Ci1-P1̄ (Nr.2) with lattice parameters a = 715.5(2), b = 720.5(2), c = 1178.9(4), a = 78.96(2)°, β = 85.45(2)°, γ = 60.12(1)°, Z = 2. The structure is characterized by iso­lated (B3O6)3--rings and contains two ninefold coordinated Ba-sites. Zn2+ is tetrahedrally coordinated by oxygen. The relation to the crystal structures of high-temperature BaB2O4 and Ba2Ca(B3O6)2 is discussed.

scholarly journals Phase equilibria in the Gd–Cr–Ge system at 1070 K

2021 ◽  
Vol 22 (2) ◽  
pp. 248-254
Author(s):  
M. Konyk ◽  
L. Romaka ◽  
Yu. Stadnyk ◽  
V.V. Romaka ◽  
V. Pashkevych
Keyword(s):  
Phase Diagram ◽  
Isothermal Section ◽  
Ternary System ◽  
Electron Microprobe ◽  
Structure Type ◽  
Space Group ◽  
X Ray ◽  
Type Space ◽  
Ternary Compounds ◽  
Pearson Symbol

The isothermal section of the phase diagram of the Gd–Cr–Ge ternary system was constructed at 1070 K over the whole concentration range using X-ray diffractometry, metallography and electron microprobe (EPM) analysis. Three ternary compounds are realized in the Gd–Cr–Ge system at the temperature of annealing: Gd117Cr52Ge112 (Tb117Fe52Ge112 structure type,  space group Fm-3m, Pearson symbol cF1124, a = 2.8971(6) nm), GdCr6Ge6 (SmMn6Sn6 structure type, space group P6/mmm, Pearson symbol hP16, a = 0.51797(2), c = 0.82901(4) nm) and GdCr1-хGe2 (CeNiSi2 structure type, space group Cmcm, Pearson symbol oS16, a = 0.41569(1)-0.41593(8), b = 1.60895(6)-1.60738(3), c = 0.40318(1)-0.40305(8) nm). For the GdCr1-xGe2 compound the homogeneity range was determined (x=0.73 – 0,69).

Unsymmetrische BN23--Ionen in den Strukturen von Ca2ClBN2 und Sr2ClBN2 / Unsymmetric BN23--Ions in the Structures of Ca2ClBN2 and Sr2ClBN2

1997 ◽  
Vol 52 (3) ◽  
pp. 340-344 ◽  
Author(s):  
Olaf Reckeweg ◽  
H.-Jürgen Meyer
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Bond Angles ◽  
New Compounds

Abstract The new compounds Ca2ClBN2 (1) and Sr2ClBN2 (2) were prepared from the respective metal, its dihalide and h-BN in sealed tantalum ampoules at 1200 °C. The crystals obtained were transparent yellow (1) and blue (2), respectively. The crystal structures were determined from single crystal X-ray data. Ca2ClBN2 and Sr2ClBN2 are isotypic and crystallize in the orthorhombic space group Pnma (No. 62), Z = 4 (Ca2ClBN 2: a = 1166.7(2), b = 390.26(4), c = 899.8(1) pm, R1 = 0.043, wR2 = 0.115 for 554 independent reflections; Sr2ClBN2: a = 1242.8(1), b = 416.75(4), c = 920.8(1) pm, R1 = 0.031, wR2 = 0.054 for 662 independent reflections).The structures contain two different layers of M2+, Cl- and BN23- alternating along the [010] direction. The bond angles N-B-N are 177.2(4)° for (1) and 176,6(5)° for (2), the bond distances of the BN23- ions are dB_ N1] = 134.6(5) pm for (1), 136,3(7) pm for (2) and dB_N2 = 132.4(5) pm for (1) and 131,3(7) pm for (2). The unsymmetric structure of the BN23- ion, as is manifested particularly in the Sr compound (2), is caused by the coordination of N1 to four cations while N2 is coordinated only to three.

Neue gemischte Sr/Ba-Trielide AIIInxMIII1– x (M = Ga, Al)

2008 ◽  
Vol 63 (7) ◽  
pp. 804-818 ◽  
Author(s):  
Marco Wendorff ◽  
Caroline Röhr
Keyword(s):  
Ternary System ◽  
Single Crystal ◽  
Composition Range ◽  
Structure Type ◽  
Orthorhombic Space Group ◽  
Triclinic Space Group ◽  
Space Group ◽  
X Ray ◽  
New Compounds

A series of new ternary mixed Sr and Ba trielides of overall composition 1 : 1 was synthesized from stoichiometric quantities of the elements. The structures of the new compounds were determined using single crystal X-ray data. In the case of the Sr compounds, commensurately modulated new superstructures of the CrB type are formed in the In-rich part of the ternary system SrAl - SrGa - SrIn: The gallides, SrIn1−xGax (x = 0.30, orthorhombic, space group Ima2, a = 1954.2(7), b = 1305.6(4), c = 1272.6(3) pm, Z = 48, R1 = 0.0848) are formed in the composition range x = 0.20 to 0.30. The closely related aluminide SrIn1−xAlx (x = 0.04, orthorhombic, space group Pnna, a = 1280.1(7), b = 1482.0(5), c = 1308.7(5) pm, Z = 36, R1 = 0.1164) and the isotypic Zn compound SrIn0.90Zn0.10 (a = 1277.7(4), b = 1489.9(3), c = 1301.3(4) pm, R1 = 0.0629) also contain mainly In as the triele element. The structures, similar to CrB, contain zig-zag chains of two-bonded In-Ga/Al, in which the ordering of the trieles results in a strong wavelike form of the originally planar zig-zag chains. In contrast, no corresponding Ba compounds were formed. Instead, BaIn0.46Ga0.54 (triclinic, space group P1̄, a = 661.1(3), b = 679.4(2), c = 712.4(3) pm, α = 69.13(3), β = 77.14(3), γ = 84.27(3)°, Z = 2, R1 = 0.0557) crystallizes with a new structure type and exhibits a planar rhomb-like anion with both two- and three-bonded In/Ga atoms. Attempts to obtain 1 : 1 compounds in-between BaAl and BaIn resulted in the formation of the 5 : 6 phases Ba5In6−xAlx (x = 4.1/5.1, hexagonal, space group P6̄m2, a = 612.2(4)/608.6(1), c = 1124.6(10)/1116.80(6) pm, Z = 1, R1 = 0.0608/0.0147) which are isotypic to Ba5M5IIIMIV (MIII = Al, Ge; MIV = Sn, Pb). Their structures contain isolated In anions (coordinated by 11 Ba atoms) and sheets of 3- and 4-bonded Al/In atoms similar to those known from the structures of Ba aluminides like Ba3Al5.

Preparation and Crystal Structures of Th5Fe19P12 and ThFe4P2

1992 ◽  
Vol 47 (11) ◽  
pp. 1521-1528 ◽  
Author(s):  
Jörg H. Albering ◽  
Wolfgang Jeitschko
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Large Family ◽  
Structure Type ◽  
Trigonal Prism ◽  
Monoclinic Structure ◽  
X Ray ◽  
New Compounds ◽  
Trigonal Prismatic

The new compounds Th5Fe19P12 and ThFe4P2 were prepared by reaction of the elemental components in a tin flux and their crystal structures were determined from single-crystal X-ray data. Th5Fe19P12 crystallizes with a new monoclinic structure type: C2/m, a = 2920.3(3), b = 379.18(3), c = 931.48(8) pm, β = 103.36(1)°, Z = 2, R = 0.031. ThFe4P2 is isotypic with SmNi4P2: P nnm, a = 1448.9(2), b = 1074.7(2), c = 376.98(4) pm, Z = 6, R = 0.030. Both compounds belong to the large family of structures with a metal : nonmetal ratio of exactly or nearly 2:1. In these phosphides all phosphorus atoms have nine metal neighbors: six are forming a trigonal prism with three additional neighbors capping the rectangular faces of the prism. In both structures the thorium atoms have trigonal prismatic or octahedral phosphorus coordination. Most iron atoms have the usual tetrahedral phosphorus environment. In addition, the structure of Th5Fe19P12 has iron atoms in rectangular and distorted square pyramidal phosphorus coordination, while the structure of ThFe4P2 contains iron atoms with only two or three phosphorus neighbors.

CuTb2[B8O16]: Das erste „Metaborat“ mit einem 1∞[B8O16]8--Anion / CuTb2[B8O16]: The First “Metaborate” with a 1∞[B8O16]8- Anion

1995 ◽  
Vol 50 (5) ◽  
pp. 757-761 ◽  
Author(s):  
Jan Schaefer ◽  
Karsten Bluhm
Keyword(s):  
Single Crystals ◽  
Crystal Structures ◽  
Structure Type ◽  
Lattice Parameters ◽  
Space Group ◽  
X Ray ◽  
Bluish Green ◽  
Unknown Structure

Abstract Pale bluish-green single crystals of the new compound CuTb2[B8O16] have been obtained by a B2O3 flux technique. They crystallize in an unknown structure type. X-ray investigations on single crystals led to the space group C52h-P21/c (Nr. 14) with lattice parameters a = 1024.6(1); b = 834.93(6); c = 622.87(6) pm , β = 90.45(2)°; Z = 2. The structure contains 1∞[B8O16]8- chains isolated from each other, which include tri- and tetracoordinated boron. The chains consist of alternating twelve- and eight-membered rings of boron and oxygen connected by BO4 units. Tb3+ is octacoordinated and Cu2+ is hexacoordinated in elongated octahedra by oxygen. The relation to the crystal structures of Tb[B3O6] and CuTb[B5O10] is pointed out.

scholarly journals Interaction of the components in the Gd-Mn-Sn ternary system at 873 and 673 K

2018 ◽  
Vol 19 (1) ◽  
pp. 60-65
Author(s):  
L. P. Romaka ◽  
Yu. V. Stadnyk ◽  
V. V. Romaka ◽  
M. Konyk ◽  
R. Serkiz
Keyword(s):  
Solid Solution ◽  
Ternary System ◽  
Substitutional Solid Solution ◽  
Structure Type ◽  
Binary Compound ◽  
Interstitial Solid Solution ◽  
Space Group ◽  
X Ray ◽  
Type Space ◽  
Ternary Compounds

The interaction of the components in the Gd-Mn-Sn ternary system was studied using the methods of X-ray and microstructure analyses, in the whole concentration range. The phase diagrams of the Gd-Mn-Sn system were constructed at 873 and 673 K. At both temperature of investigation the Gd-Mn-Sn system is characterized by existence of two ternary compounds: GdMn6Sn6 (MgFe6Ge6 structure type, space group P6/mmm) and Gd4Mn4Sn7 (Zr4Co4Ge7 structure type, space group I4/mmm). The formation of the interstitial solid solution GdMnхSn2 based on GdSn2 (ZrSi2-type) binary compound was found up to 10 at. % Mn at 873 K and 673 K. The existence of the substitutional solid solution based on GdMn2 (MgCu2-type) was observed up to 5 at.% Sn and 3 at. % Sn at 873 K and 673 K, respectively.

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