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Einfluss der Valenzelektronenkonzentration auf die Bildung der Phasen vom Ni 2 In‐Strukturtyp am Beispiel der ternären Verbindungen Mn 2 Ga 0.5 As 0.5 ( m ),Fe 3 GaAs und Co 2 Ga 0.5 As 0.5
Author(s) -
Ellner M.,
ElBoragy M.
Publication year - 1986
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889886089884
Subject(s) - crystallography , chemistry , metastability , ternary operation , valence (chemistry) , solid solution , crystal structure , organic chemistry , computer science , programming language
The structures of the metastable phase Mn 2 Ga 0.5 As 0.5 ( m ) and the stable phases Fe 3 GaAs and Co 2 Ga 0.5 As 0.5 are isotypic with Ni 2 In. X‐ray powder diffraction data are reported. Lattice constants and macroscopic densities were measured in the entire range of homogeneity. Crystal chemical parameters of these ternary phases and of the quasi‐homologous isovalent phases are compared and discussed from the point of view of the valence‐electron concentration and of the number of atoms in the unit cell. It is concluded that the valence‐electron concentration is a very important but not a sufficient energetic factor for the stability of phases with the Ni 2 In structure.