Neue intermetallische Verbindungen im anti-PbFCl-Strukturtyp.

1976 ◽  
Vol 31 (8) ◽  
pp. 1050-1052 ◽  
Author(s):  
Wolfgang Dörrscheidt ◽  
Herbert Schäfer
Keyword(s):  
Intermetallic Compounds ◽  
Structure Type

Three new intermetallic compounds CaMnGe, SrMnGe and BaMnGe have been prepared. They crystallize tetragonal in the anti-PbFCl-structure type with the following constants :CaMnGe: a = 4.23(1); c = 7.27(1); c/a = 1.72,SrMnGe: a = 4.40(1); c = 7.52(1); c/a = 1.71,BaMnGe: a = 4.50(1); c = 7.92(1); c/a = 1.76.

Zur Kenntnis von Ca11Sb10 und Ca11Bi10

1976 ◽  
Vol 31 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Klaus Deller ◽  
Brigitte Eisenmann
Keyword(s):  
Intermetallic Compounds ◽  
Structure Type

The new intermetallic compounds Ca11Sb10 and Ca11Bi10 crystallize tetragonal in the Yb11Sb10-structure type. There are 4-membered Sb(Bi)-rings, Sb2(Bi2)-dumb-bells and isolated Sb(Bi)atoms in the structure

Strategies for full structure solution of intermetallic compounds using precession electron diffraction zonal data

2014 ◽  
Vol 47 (3) ◽  
pp. 1032-1041 ◽  
Author(s):  
Shmuel Samuha ◽  
Yaakov Krimer ◽  
Louisa Meshi
Keyword(s):  
Electron Diffraction ◽  
Intermetallic Compounds ◽  
Intermetallic Phase ◽  
Structure Type ◽  
Atomic Model ◽  
Coordination Polyhedra ◽  
Structure Solution ◽  
Precession Electron Diffraction ◽  
Full Structure ◽  
Merging Process

Owing to the individuality of intermetallic compounds, they are regarded as a special class of materials. As such, there is a need to develop a step-by-step methodology for solution of their structure. The current paper adapts the methodology of structure solution from precession electron diffraction (PED) zonal data for intermetallics. The optimization of PED parameters for structure determination was achieved through the development of the atomic model of a well known Mg17Al12(β) intermetallic phase. It was concluded that the PED acquisition parameters, the number of unique reflections and the quality of the merging process are the most important parameters that directly influence the correctness of a structure solution. The proposed methodology was applied to the structure solution of a highly complex new Mg48Al36Ag16phase, which was recently revealed in the Mg–Al–Ag system. The final atomic model consisted of 152 atoms in the unit cell, distributed over 23 unique atomic positions. The correctness of the atomic model was verified by the reasonability of the interatomic distances and coordination polyhedra formed. It was found that the experimental model of Φ-Al17.1Mg53.4Zn29.5can be assigned as a structure type for the Mg48Al36Ag16phase. The Δ value, which measures the similarity between two structures, was calculated as 0.040.

The Ce2Li0.39Ni1.61Si2structure as a new derivative of the AlB2family

2014 ◽  
Vol 70 (6) ◽  
pp. 622-626 ◽  
Author(s):  
Andrij Stetskiv ◽  
Beata Rozdzynska-Kielbik ◽  
Volodymyr Pavlyuk
Keyword(s):  
Intermetallic Compounds ◽  
Title Compound ◽  
Classification Scheme ◽  
Tight Binding ◽  
Structure Type ◽  
Vertex Polyhedron ◽  
Orbital Method ◽  
Crystal Chemical ◽  
Nickel Disilicide ◽  
Metallic Bonding

A new quaternary dicerium lithium/nickel disilicide, Ce2Li0.39Ni1.61Si2, crystallizes as a new structure type of intermetallic compounds closely related to the AlB2family. The crystal–chemical interrelationships between parent AlB2-type, BaLiSi, ZrBeSi and the title compound are discussed using the Bärnighausen formalism. Two Ce atoms occupy sites of 3m. symmetry. The remainder,i.e.Ni, mixed Ni/Li and Si atoms, occupy sites of \overline{6}m2 symmetry. The environment of the Ce atom is an 18-vertex polyhedron and the Ni, Ni/Li and Si atoms are enclosed in tricapped trigonal prisms. The title structure can be assigned to class No. 10 (trigonal prism and its derivatives) according to the Krypyakevich classification scheme [Krypyakevich (1977). InStructure Types of Intermetallic Compounds. Moscow: Nauka]. The electronic structure of the title compound was calculated using the tight-binding linear muffin-tin orbital method in the atomic spheres approximation (TB-LMTO-ASA). Metallic bonding is dominant in this compound. The strongest interactions are Ni—Si and Ce—Si.

Neue intermetallische Verbindungen im anti-PbCl2Typ / New Intermetallic Compounds of the anti-PbCl2-Structure Type

1975 ◽  
Vol 30 (9-10) ◽  
pp. 677-680 ◽  
Author(s):  
Brigitte Eisenmann ◽  
Herbert Schäfer ◽  
Karlheinz Turban
Keyword(s):  
Intermetallic Compounds ◽  
Structure Type

The intermetallic compounds Sr2Ge, BaCaSi, BaCaGe, BaCaSn, BaCaPb, CaLiBi and SrLiBi crystallize in the anti-PbCl2-structure. They belong to the Co2P-subgroup of this structure type.

Notizen: Ternäre Gamma-Messing Phasen in den Systemen Calcium-MIB(IIB)-Quecksilber / New Ternary Gamma-Brass Phases in the Systems Ca-MIB(IIB)-Hg

1980 ◽  
Vol 35 (12) ◽  
pp. 1594-1595 ◽  
Author(s):  
Z. Ban ◽  
M. Pušelj
Keyword(s):  
Intermetallic Compounds ◽  
Powder Diffraction ◽  
Structure Type ◽  
Density Measurements ◽  
X Ray ◽  
Unit Cells ◽  
Diffraction Patterns ◽  
Ternary Intermetallic Compounds

Abstract A series of new ternary intermetallic compounds of the general composition Ca16M18IB(IIB)-Hg18 (M = Zn, Cd, Hg, Cu, Ag and Au) has been identified. The X-ray powder diffraction patterns were indexed on a basis of primitive cubic unit cells.From the X-ray data and density measurements it is concluded that these phases belong to the partially disordered (MIB(IIB) and Hg) gamma-brass structure type D83.

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.

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