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NaGe—High‐Pressure Formation of the NaPb‐Type Structure
Author(s) -
Evers Jürgen,
Oehlinger Gilbert,
Sextl Gerhard,
Weiss Armin
Publication year - 1985
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.198505001
Subject(s) - substructure , type (biology) , tetrahedron , high pressure , chemistry , crystallography , biology , physics , thermodynamics , engineering , structural engineering , ecology
An increase in coordination numbers from 6:6 to 7:7 accompanies the conversion of the normal‐pressure modification of NaGe, the only compound of the NaGe type, into a NaPb‐type modification under pressure. This increase is in turn accompanied by an increase in density of ca. 5%. The Ge substructure, consisting of isolated tetrahedra, remains unaltered. Large changes in electrical properties are to be expected in a modification with 8:8 coordination, which could be obtained at still higher pressures.