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Formation of a KNbO3 single crystal using solvothermally synthesized K2-mNb2O6-m/2 pyrochlore phase
Journal of Electroceramics ( IF 1.7 ) Pub Date : 2018-07-07 , DOI: 10.1007/s10832-018-0149-7
Woong-Hee Lee , Young-Jin Ko , Mir Im , Sang-Hyo Kweon , Sung-Hoon Cho , HaiBo Xu , Chong-Yun Kang , Sahn Nahm

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.



中文翻译:

KNbO的形成3 溶剂热合成钾单晶2米2Ø6米/ 2 烧绿石相

将0.6≤x≤1.2的Nb 2 O 5  + x mol%KOH标本在230°C溶剂热加热24 h,形成具有烧绿石相的AK 2-m Nb 2 O 6-m / 2单晶。它们具有大小为100μm的八面体形状,并且该单晶的组成接近K 1.3 Nb 2 O 5.65。单晶的KNbO 3时形成单晶ķ 2-间的Nb 2 ö 6-M / 2在使用K 600℃和800℃之间的温度下退火2 CO 3粉末。当在600°C(或少量K 2 CO 3)下进行退火时,KNbO 3单晶具有在​​低温(<-10°C)下稳定的菱形结构。菱形KNbO 3结构的形成可以通过样品中K +空位的存在来解释。当将K 2-m Nb 2 O 6-m / 2单晶在800°C和20 wt%的K 2 CO 3退火时,形成具有正交晶结构的KNbO 3单晶。

更新日期:2018-07-07
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