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

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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.

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References

  1. Y. Nakayama, P.J. Pauzauskie, A. Radenovic, R.M. Onorato, R.J. Saykally, J. Liphardt, P. Yang, Nature 447(7148), 1098–1101 (2007)

    Article  CAS  Google Scholar 

  2. B. Li, Y. Hakuta, H. Hayashi, J. Supercrit. Fluids 35(3), 254–259 (2005)

    Article  CAS  Google Scholar 

  3. V.I. Chani, K. Shimamura, T. Fukuda, Cryst. Res. Technol. 34(4), 519–525 (1999)

    Article  CAS  Google Scholar 

  4. H. Kimura, A. Miyazaki, K. Maiwa, Z.X. Cheng, C.V. Kannan, Opt. Mater. 30(1), 198–200 (2007)

    Article  CAS  Google Scholar 

  5. M. Mann, S. Jackson, J. Kolis, J. Solid State Chem. 183(11), 2675–2680 (2010)

    Article  CAS  Google Scholar 

  6. M.R. Joung, H. Xu, J.S. Kim, I.T. Seo, S. Nahm, J.Y. Kang, S.J. Yoon, J. Appl. Phys. 111(11), 114314 (2012)

    Article  Google Scholar 

  7. M.R. Joung, H. Xu, I.T. Seo, D.H. Kim, J. Hur, S. Nahm, H.M. Park, J. Mater. Chem. A 2(43), 18547–18553 (2014)

    Article  CAS  Google Scholar 

  8. S. Chakraborty, S.K. Ghosh, G.C. Das, S. Mukherjee, Int. J. Appl. Ceram. Technol. 13(4), 743–752 (2016)

    Article  CAS  Google Scholar 

  9. C. Huiqun, Y. Cheng, Y. Jie, C. Bo, X. Hong, Y. Bin, Rare Metal Mat. Eng. 45(6), 1391–1395 (2016)

    Article  Google Scholar 

  10. Y. Wang, X. Kong, W. Tian, D. Lei, X. Lei, RSC Adv. 6(63), 58401–58408 (2016)

    Article  CAS  Google Scholar 

  11. G. Shi, J. Wang, H. Wang, Z. Wu, H. Wu, Ceram. Int. 43(9), 7222–7230 (2017)

    Article  CAS  Google Scholar 

  12. X. Kong, D. Hu, P. Wen, T. Ishii, Y. Tanaka, Q. Feng, Dalton Trans. 42(21), 7699–7709 (2013)

    Article  CAS  Google Scholar 

  13. H. Tian, X. Meng, C. Hu, P. Tan, X. Cao, G. Shi, Z. Zhou, R. Zhang, Sci. Rep. 6(1), 25637 (2016)

    Article  CAS  Google Scholar 

  14. Y. Purusothaman, N.R. Alluri, A. Chandrasekhar, S.J. Kim, J. Mater. Chem. C 5(22), 5501–5508 (2017)

    Article  CAS  Google Scholar 

  15. F. Madaro, J.R. Tolchard, Y. Yu, M.A. Einarsrud, T. Grande, CrystEngComm. 13(5), 1350–1359 (2011)

    Article  CAS  Google Scholar 

  16. D.H. Kim, M.R. Joung, I.T. Seo, J. Hur, J.H. Kim, B.Y. Kim, H.J. Lee, S. Nahm, J. Eur. Ceram. Soc. 34(16), 4193–4200 (2014)

    Article  CAS  Google Scholar 

  17. N. Kumada, T. Kyoda, Y. Yonesaki, T. Takei, N. Kinomura, Mater. Res. Bull. 42(10), 1856–1862 (2007)

    Article  CAS  Google Scholar 

  18. G. Pecchi, B. Cabrera, A. Buljan, E.J. Delgado, A.L. Gordon, R. Jimenez, J. Alloys Compd. 551, 255–261 (2013)

    Article  CAS  Google Scholar 

  19. S. Kumar, L.K. Sahay, A.K. Jha, K. Prasad, Adv. Mater. Lett. 5, 67 (2013)

    Article  Google Scholar 

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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.

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Authors and Affiliations

  1. Department of Materials Science and Engineering Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul, 02841, Republic of Korea

    Woong-Hee Lee, Sang-Hyo Kweon, Sung-Hoon Cho & Sahn Nahm

  2. Nano-Bio-Information-Technology, KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul, 02841, Republic of Korea

    Young-Jin Ko, Mir Im, Chong-Yun Kang & Sahn Nahm

  3. Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea

    HaiBo Xu & Chong-Yun Kang

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  1. Woong-Hee Lee
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  2. Young-Jin Ko
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Correspondence to Sahn Nahm.

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Lee, WH., Ko, YJ., Im, M. et al. Formation of a KNbO3 single crystal using solvothermally synthesized K2-mNb2O6-m/2 pyrochlore phase. J Electroceram 41, 37–42 (2018). https://doi.org/10.1007/s10832-018-0149-7

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  • DOI: https://doi.org/10.1007/s10832-018-0149-7

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