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Formation of a KNbO3 single crystal using solvothermally synthesized K2-mNb2O6-m/2 pyrochlore phase

  • Woong-Hee Lee
  • Young-Jin Ko
  • Mir Im
  • Sang-Hyo Kweon
  • Sung-Hoon Cho
  • HaiBo Xu
  • Chong-Yun Kang
  • Sahn Nahm
Article
  • 47 Downloads

Abstract

A K2-mNb2O6-m/2 single crystal with a pyrochlore phase formed when the Nb2O5 + x mol% KOH specimens with 0.6 ≤ x ≤ 1.2 were solvothermally heated at 230 °C for 24 h. They have an octahedral shape with a size of 100 μm, and the composition of this single crystal is close to K1.3Nb2O5.65. The single-crystal KNbO3 formed when the single-crystal K2-mNb2O6-m/2 was annealed at a temperature between 600 °C and 800 °C with K2CO3 powders. When annealing was conducted at 600 °C (or with a small amount of K2CO3), the KNbO3 single crystal has a rhombohedral structure that is stable at low temperatures (< − 10 °C). The formation of the rhombohedral KNbO3 structure can be explained by the presence of the K+ vacancies in the specimen. The KNbO3 single crystal with an orthorhombic structure formed when the K2-mNb2O6-m/2 single crystal was annealed at 800 °C with 20 wt% of K2CO3.

Keywords

Solvothermal synthesis KNbO3 Single crystal Metal vacancy 

Notes

Acknowledgements

This work 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). The authors also thank the Ku-Kist graduate school program of Korea University.

Supplementary material

10832_2018_149_MOESM1_ESM.docx (1.8 mb)
ESM 1 (DOCX 1811 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Woong-Hee Lee
    • 1
  • Young-Jin Ko
    • 2
  • Mir Im
    • 2
  • Sang-Hyo Kweon
    • 1
  • Sung-Hoon Cho
    • 1
  • HaiBo Xu
    • 3
  • Chong-Yun Kang
    • 2
    • 3
  • Sahn Nahm
    • 1
    • 2
  1. 1.Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea
  2. 2.Nano-Bio-Information-Technology, KU-KIST Graduate School of Converging Science and TechnologyKorea UniversitySeoulRepublic of Korea
  3. 3.Electronic Materials Research CenterKorea Institute of Science and Technology (KIST)SeoulRepublic of Korea

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