Effects of K2O Evaporation on the Structural Properties of KSbO3 Compounds

Jongseong Park, Dae Hyeon Kim, Su Jin Park, Tae Gon Lee, Mir Im, Jeong Seog Kim, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A specimen having a stoichiometric composition of KSbO3·(KSb) calcined at 800°C has an R (Formula presented.) rhombohedral structure (RS), and changes to a Pn (Formula presented.) 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 K1.1SbO3 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 (Formula presented.) is a stable form of KSbO3. The formation of Pn (Formula presented.) cubic and <111>-oriented R (Formula presented.) phases can be explained by the evaporation of K2O during the calcination process at temperatures above 1100°C.

Original languageEnglish
Pages (from-to)2229-2232
Number of pages4
JournalJournal of the American Ceramic Society
Volume99
Issue number7
DOIs
Publication statusPublished - 2016 Jul 1

Keywords

  • evaporation
  • potassium/potassium compounds
  • structure

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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