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Effects of K 2 O Evaporation on the Structural Properties of KSbO 3 Compounds
Author(s) -
Park Jongseong,
Kim DaeHyeon,
Park SuJin,
Lee Taegon,
Im Mir,
Kim JeongSeog,
Nahm Sahn
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14330
Subject(s) - calcination , stoichiometry , trigonal crystal system , evaporation , materials science , crystallography , phase (matter) , composition (language) , chemical composition , mineralogy , analytical chemistry (journal) , x ray crystallography , crystal structure , chemistry , diffraction , thermodynamics , catalysis , physics , biochemistry , linguistics , philosophy , organic chemistry , chromatography , optics
A specimen having a stoichiometric composition of KSbO 3 ·(KSb) calcined at 800°C has an R 3 ¯ rhombohedral structure (RS), and changes to a Pn 3 ¯ cubic structure (CS) when calcined at 1100°C. Finally, a <111>‐oriented rhombohedral phase is formed in the specimen calcined at 1230°C. K/Sb ratio decreases from 1.0 in RS, 0.93 in CS, and finally to 0.85 in <111>‐oriented rhombohedral phases. On the other hand, a specimen having a K‐excess composition of K 1.1 SbO 3 calcined at 800°C shows a RS that is maintained in the K‐excess specimen calcined at 1230°C. The composition of these specimens is very close to KSb. Therefore, the RS with a space group of R 3 ¯ is a stable form of KSbO 3 . The formation of Pn 3 ¯ cubic and <111>‐oriented R 3 ¯ phases can be explained by the evaporation of K 2 O during the calcination process at temperatures above 1100°C.