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High‐Pressure Phases of KSi, KGe, RbSi, RbGe, CsSi, and CsGe with the NaPb‐Type Structure
Author(s) -
Evers Jürgen,
Oehlinger Gilbert,
Sextl Gerhard,
Weiss Armin
Publication year - 1984
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198405281
Subject(s) - tetragonal crystal system , metastability , alkali metal , type (biology) , chemistry , structure type , materials science , crystallography , analytical chemistry (journal) , mathematics , chromatography , crystal structure , biology , ecology , organic chemistry
Six novel phases of the 1:1‐silicides and ‐germanides of K, Rb, and Cs have been synthesized using a high‐temperature method (4 GPa, 600°C); under normal conditions they are metastable. The six compounds crystallize in the cubic KGe‐type at normal pressure; the nine phases belong to the tetragonal NaPb‐type, which have previously only been found in stannides and plumbides of the alkali metals. The constant axes ratio c / a ≈ 1.63 suggests geometrical relationships of the NaPb‐type.