Formation of a KNbO3 single crystal using solvothermally synthesized K2-mNb2O6-m/2 pyrochlore phase
- Authors
- Lee, Woong-Hee; Ko, Young-Jin; Im, Mir; Kweon, Sang-Hyo; Cho, Sung-Hoon; Xu, HaiBo; Kang, Chong-Yun; Nahm, Sahn
- Issue Date
- 12월-2018
- Publisher
- SPRINGER
- Keywords
- Solvothermal synthesis; KNbO3; Single crystal; Metal vacancy
- Citation
- JOURNAL OF ELECTROCERAMICS, v.41, no.1-4, pp.37 - 42
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ELECTROCERAMICS
- Volume
- 41
- Number
- 1-4
- Start Page
- 37
- End Page
- 42
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/71407
- DOI
- 10.1007/s10832-018-0149-7
- ISSN
- 1385-3449
- Abstract
- A K2-mNb2O6-m/2 single crystal with a pyrochlore phase formed when the Nb2O5+x mol% KOH specimens with 0.6x1.2 were solvothermally heated at 230 degrees C for 24h. They have an octahedral shape with a size of 100m, 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 degrees C and 800 degrees C with K2CO3 powders. When annealing was conducted at 600 degrees C (or with a small amount of K2CO3), the KNbO3 single crystal has a rhombohedral structure that is stable at low temperatures (< - 10 degrees 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 degrees C with 20wt% of K2CO3.
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