Ternary Scandium-rich Indides Sc50T13In3 and Sc50Rh13In3Oy (T = Rh, Ir; y ≈ 8) – Synthesis and Crystal Structure

2007 ◽  
Vol 62 (12) ◽  
pp. 1567-1573 ◽  
Author(s):  
Roman Zaremba ◽  
Rainer Pöttgen
Keyword(s):  
Crystal Structure ◽  
Intermetallic Compounds ◽  
Induction Furnace ◽  
Structure Type ◽  
Crystal Chemical ◽  
Synthesis And Crystal Structure ◽  
Sample Chamber ◽  
Cubic Structure ◽  
Scandium Content ◽  
Tetrahedral Voids

New intermetallic compounds Sc50Rh13.3In2.7 and Sc50Ir13.6In2.4 and the suboxides Sc49.2Rh13In3.8O8.8 and Sc49.2Rh13.7In2.8O8.0 were synthesized from the elements or with Sc2O3 as an oxygen source, respectively, in sealed tantalum tubes in a water-cooled sample chamber of an induction furnace. They crystallize with a new cubic structure type, space group Fm3̅, a = 1772.5(6) pm, wR2 = 0.032, 1111 F2 values, 34 variables for Sc50Rh13.3In2.7, a = 1766.5(6) pm, wR2 = 0.041, 745 F2 values, 34 variables for Sc50Ir13.6In2.4, a = 1764.4(2) pm, wR2 = 0.044, 690 F2 values, 41 variables for Sc49.2Rh13In3.8O8.8, and a = 1761.5(6) pm, wR2 = 0.054, 740 F2 values, 42 variables for Sc49.2Rh13.7In2.8O8.0. The main structural motifs are rhodium-centered indium cubes in an fcc like arrangement in which the octahedral and tetrahedral voids are filled by In2Sc12 and In1Sc12 icosahedra, respectively, resembling a Li3Bi-like structure. The Rh1 (Ir1) and Sc4 atoms lie between these polyhedral units. The oxygen atoms partially fill Sc6 octahedra in Sc49.2Rh13In3.8O8.8 and Sc49.2Rh13.7In2.8O8.0 with Sc-O distances of 214 - 230 pm. These octahedra are condensed via common edges and faces, encapsulating the In2Sc12 icosahedra. Due to the high scandium content one observes strong Sc-Sc bonding with Sc-Sc distances ranging from 303 to 362 pm in Sc49.2Rh13In3.8O8.8. The shortest distances occur for Sc-Rh (267 - 295 pm). The crystal chemical relationship with the Li3Bi-related suboxide Ti12Sn3O10 is discussed.

Synthesis and crystal structure of (Ag,Pd)22Se6

2013 ◽  
Vol 28 (1) ◽  
pp. 13-17 ◽  
Author(s):  
F. Laufek ◽  
A. Vymazalová ◽  
D.A. Chareev ◽  
A.V. Kristavchuk ◽  
J. Drahokoupil ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Diffraction Data ◽  
Glass Tube ◽  
Structure Type ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Cell Parameters ◽  
Silica Glass Tube

The (Ag,Pd)22Se6 phase was synthesized from individual elements by silica glass tube technique and structurally characterized from powder X-ray diffraction data. The (Ag,Pd)22Se6 phase crystallizes in Fm$\overline3$m symmetry, unit-cell parameters: a = 12.3169(2) Å, V = 1862.55(5) Å3, Z = 4, and Dc = 10.01 g/cm3. The crystal structure of the (Ag,Pd)22Se6 phase represents a stuffed 3a.3a.3a superstructure of the Pd structure (fcc), where only 4 from 108 available octahedral holes are occupied. Its crystal structure is related to the Cr23C6 structure type.

scholarly journals Crystal structure of guanidinium hexafluoridovanadate(III), (CN3H6)3[VF6]: an unusual hybrid compound related to perovskite

2017 ◽  
Vol 73 (3) ◽  
pp. 244-246 ◽  
Author(s):  
Cameron Black ◽  
Philip Lightfoot
Keyword(s):  
Crystal Structure ◽  
Physical Properties ◽  
Title Compound ◽  
Crystal Chemical ◽  
Hybrid Compound ◽  
Structure Space ◽  
Perovskite Materials ◽  
Synthetic Routes ◽  
Cubic Structure ◽  
Covalent Interactions

Vanadium fluorides with novel crystal–chemical features and interesting physical properties can be prepared by solvothermal synthetic routes. The title compound, guanidinium hexafluoridovanadate(III), has a cubic structure (space group Pa\overline{3}), exhibiting isolated regular VF6 octahedral units, which are hydrogen bonded to protonated guanidinium moieties. Although the VF6 octahedral units are not linked directly together, there are structural similarities between this crystal structure and those of the wider family of perovskite materials, in particular, hybrid perovskites based on extended ligands such as cyanide. In this context, the octahedral tilt system of the present compound is of interest and demonstrates that unusual tilt systems can be mediated via `molecular' linkers which allow only supramolecular rather than covalent interactions.

Synthesis and Crystal Structure of Tetraphenylarsonium Pentachlorocarbonylosmate(IV), (Ph4As)[OsCl5(CO)]

1997 ◽  
Vol 52 (8) ◽  
pp. 978-980 ◽  
Author(s):  
M Höhling ◽  
W Preetz
Keyword(s):  
Crystal Structure ◽  
Complex Anion ◽  
Structure Type ◽  
Close Packing ◽  
Cation Sublattice ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Positional Disorder ◽  
Intermolecular Contacts

The structure of tetraphenylarsonium pentachlorocarbonylosmate(IV), (Ph4As)[OsCl5(CO)], the first example of a halogenocarbonyl complex with osmium in the oxidation state +IV, has been determined at 208 K by single crystal X-ray diffraction: tetragonal, space group P4/n with a = 12.821 , c = 8.084 Å, Z = 2. There are short intermolecular contacts between neighbouring anions along the tetragonal axis c and unusually large displacement ellipsoids of the carbonyl group and the four equatorial Cl ligands arising from a positional disorder of the complex anion. By analogy with a variety of reported structures of the (Ph4As)[RuNCl4] structure type this is attributed to the close packing of the cation sublattice. Compared to other monocarbonylosmates the Os-C bond of 1.94(2) Å is extraordinaryly long while the bond between Os and the trans coordinated Cl ligand of 2.286(3) Å is rather short.

Darstellung und Kristallstruktur von K2Pd02 / Synthesis and Crystal Structure of K2Pd02

1974 ◽  
Vol 29 (1-2) ◽  
pp. 10-12 ◽  
Author(s):  
Horst Sabrowsky ◽  
Welf Bronger ◽  
Dieter Schmitz
Keyword(s):  
Crystal Structure ◽  
Structure Type ◽  
Chain Structure ◽  
Unit Cell ◽  
One Dimension ◽  
Ternary Oxide ◽  
Orthorhombic Unit Cell ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
A Chain

The ternary oxide K2PdO2 has been prepared by a reaction between K2O and PdO. X-ray investigations suggest a chain-structure-type which corresponds to that of K2PtS2. The planar oxygen coordinations of the palladium atoms are connected laterally in one dimension. The orthorhombic unit cell (a = 8.523, b = 6.089, c = 3.119 Å) contains two formula units.

Hydrothermal synthesis and crystal structure of Na(Na,Mn)7Mn22(PO4)180.5H2O, a new compound of fillowite structure type

2006 ◽  
Vol 18 (6) ◽  
pp. 765-774 ◽  
Author(s):  
Paul Keller ◽  
Frédéric Hatert ◽  
Falk Lissner ◽  
Thomas Schleid ◽  
André-Mathieu Fransolet
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Structure Type ◽  
Synthesis And Crystal Structure

Zur Synthese und Kristallstruktur von Dibariumkaliumtrizinkborat Ba2KZn3(B3O6)(B6O13)/Synthesis and Crystal Structure of Di-barium Potassium Tri-zinc Borate Ba2KZn3(B3O6)(B6O13)

1996 ◽  
Vol 51 (3) ◽  
pp. 319-324 ◽  
Author(s):  
Silke Busche ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Type ◽  
Lattice Parameters ◽  
Zinc Borate ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Unknown Structure

Abstract Single crystals of the new compound Ba2KZn3(B3O6)(B6O13) were obtained by using a B2O3 flux technique; they crystallize in an as yet unknown structure type. X-ray investigations led to the space group Ci1-P1̄ (Nr.2) with lattice parameters a = 705.2(2), b = 712.5(2), c = 1880.3(6), a = 93.43(3)°, β = 90.72(2)°, γ = 119.57(2)°, Z = 2. The structure contains (B3O6)3--rings and a new discrete (B6O13)8- anion, which is composed of two BO4 and two B2O5 units. Zn2+ is tetrahedrally coordinated by oxygen and two out of three tenfold coordinated Ba-sites are statistically occupied by Ba2+ and K+.

Synthesis and Crystal Structure of Zr5Rh2In4 and Hf5Rh2In4 – New Ternary Indides with Lu5Ni2In4 Type Structure

2002 ◽  
Vol 57 (12) ◽  
pp. 1353-1358 ◽  
Author(s):  
Mar’yana Lukachuk ◽  
Rainer Pöttgen
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Glassy Carbon ◽  
High Frequency ◽  
X Ray Diffraction ◽  
Interatomic Distances ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Coordination Numbers ◽  
Sample Chamber

The ternary indides Zr5Rh2In4 and Hf5Rh2In2 were synthesized by high-frequency melting of the elements in glassy carbon crucibles in a water-cooled sample chamber. Both compounds have been investigated by X-ray diffraction on powders and single crystals: Lu5Ni2In4 type, Pbam, a = 1739.8(2), b = 758.3(1), c = 337.42(5) pm, wR2 = 0.0420, 1015 F2 values for Zr5Rh2In4, and a = 1732.1(3), b = 757.5(2), c = 333.36(7) pm, wR2 = 0.0534, 739 F2 values for Hf5Rh2In4 with 36 variables per refinement. The structures contain three crystallographically different zirconium(hafnium) siteswith coordination numbers 12, 14, and 16. Striking structural motifs are distorted rhodium-centered trigonal prisms formed by the zirconium(hafnium) atoms and CuAu related distorted cubes of zirconium (hafnium) and indium atoms. The shortest interatomic distances occur for Zr-Rh and Hf-Rh followed by Rh-In. Chemical bonding in these intermetallics is briefly discussed.

scholarly journals Olivine-type NaCd(AsO4)

2013 ◽  
Vol 69 (11) ◽  
pp. i75-i75 ◽  
Author(s):  
Matthias Weil
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Structure Type ◽  
Site Symmetry ◽  
Space Group ◽  
Tetrahedral Voids ◽  
Hexagonal Closed Packed

The title compound, sodium cadmium orthoarsenate, adopts the olivine [Mg2(SiO4)] structure type in space groupPnma, with Na (site symmetry -1) and Cd (.m.) replacing the two Mg positions, and the AsO4tetrahedron (.m.) the SiO4tetrahedron. The crystal structure is made up of a nearly hexagonal closed-packed arrangement of O atoms stacked along [001]. The Na and Cd atoms occupy one half of the octahedral voids in alternate layers stacked along [100], and one eighth of the tetrahedral voids are occupied by As atoms.

Sc2MgGa2and Y2MgGa2

2009 ◽  
Vol 65 (3) ◽  
pp. i7-i8 ◽  
Author(s):  
Martin Sahlberg ◽  
Yvonne Andersson
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Intermetallic Compounds ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Induction Furnace ◽  
Argon Atmosphere ◽  
Powder Diffraction Data ◽  
Single Crystal Diffraction ◽  
Coordination Numbers

Scandium magnesium gallide, Sc2MgGa2, and yttrium magnesium gallide, Y2MgGa2, were synthesized from the corresponding elements by heating under an argon atmosphere in an induction furnace. These intermetallic compounds crystallize in the tetragonal Mo2FeB2-type structure. All three crystallographically unique atoms occupy special positions and the site symmetries of (Sc/Y, Ga) and Mg arem2mand 4/m, respectively. The coordinations around Sc/Y, Mg and Ga are pentagonal (Sc/Y), tetragonal (Mg) and triangular (Ga) prisms, with four (Mg) or three (Ga) additional capping atoms leading to the coordination numbers [10], [8+4] and [6+3], respectively. The crystal structure of Sc2MgGa2was determined from single-crystal diffraction intensities and the isostructural Y2MgGa2was identified from powder diffraction data.

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