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

doi:10.1111/jace.14330

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-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 K_1.1SbO₃ 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 language	English
Pages (from-to)	2229-2232
Number of pages	4
Journal	Journal of the American Ceramic Society
Volume	99
Issue number	7
DOIs	https://doi.org/10.1111/jace.14330
Publication status	Published - 2016 Jul 1

Keywords

evaporation
potassium/potassium compounds
structure

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1111/jace.14330

Cite this

@article{1c6fda22e4244ffcb7c8831669dce375,

title = "Effects of K2O Evaporation on the Structural Properties of KSbO3 Compounds",

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.",

keywords = "evaporation, potassium/potassium compounds, structure",

author = "Jongseong Park and Kim, {Dae Hyeon} and Park, {Su Jin} and Lee, {Tae Gon} and Mir Im and Kim, {Jeong Seog} and Sahn Nahm",

note = "Funding Information: This research was supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP) and the Ministry of Trade, Industry & Energy(MOTIE) of the Republic of Korea (No.20152020104960). Publisher Copyright: {\textcopyright} 2016 The American Ceramic Society",

year = "2016",

month = jul,

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doi = "10.1111/jace.14330",

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T1 - Effects of K2O Evaporation on the Structural Properties of KSbO3 Compounds

AU - Park, Jongseong

AU - Kim, Dae Hyeon

AU - Park, Su Jin

AU - Lee, Tae Gon

AU - Im, Mir

AU - Kim, Jeong Seog

AU - Nahm, Sahn

N1 - Funding Information: This research was supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP) and the Ministry of Trade, Industry & Energy(MOTIE) of the Republic of Korea (No.20152020104960). Publisher Copyright: © 2016 The American Ceramic Society

PY - 2016/7/1

Y1 - 2016/7/1

N2 - 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.

AB - 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.

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