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“Hard–Soft” Synthesis of SrCrO 3− δ Superstructure Phases
Author(s) -
ArévaloLópez Angel M.,
Rodgers Jennifer A.,
Senn Mark S.,
Sher Falak,
Farnham James,
Gibbs William,
Attfield J. Paul
Publication year - 2012
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201206203
Subject(s) - metastability , tetrahedron , octahedron , superstructure , relaxation (psychology) , soft chemistry , crystallography , high pressure , perovskite (structure) , materials science , chemical physics , chemistry , thermodynamics , nanotechnology , physics , crystal structure , psychology , social psychology , organic chemistry
Dense metastable phases obtained under “hard” high‐pressure conditions may contain instabilities such as unusual oxidation states or coordination environments that may be partially relieved by “soft” low‐temperature chemistry. The synthesis of SrCrO 2.8 (see picture, left) and SrCrO 2.75 (right) phases from the high‐pressure perovskite SrCrO 3 leads to a relaxation of the coordination around Cr 4+ from octahedral to tetrahedral.