Fabrication of ferroelectric silicate KNbSi2O7 single crystal
Fabrication of ferroelectric silicate KNbSi2O7 single crystal
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DOI：
10.2109/jcersj2.122.389
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发表时间：
2014-06
影响因子：
1.1
通讯作者：
A. Sahashi;T. Hoshina;H. Takeda;T. Tsurumi
中科院分区：
文献类型：
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作者：
A. Sahashi;T. Hoshina;H. Takeda;T. Tsurumi
ABSi_2O_7是近年来发现的具有铁电性的新型铁电材料。在本研究中，我们集中在钾硅酸盐（KNbSi 2 O 7），它包括位移型铁电物质KNbO 3和高共价物质SiO2的结构。采用玻璃晶化、重熔、缓冷工艺制备了尺寸为10 <$10 <$1mm ~ 3的KNbSi_2 O_7单晶。极化-电场曲线表明，KNbSi_2O_7晶体在c轴方向具有明显的铁电性。自发极化的值估计为0.11 μ C/cm 2。在1 MHz下，a和c轴的介电常数约为15，并且发现该材料是具有低介电常数的铁电材料。
ABSi2O7 is a new ferroelectric material group of which ferroelectricity has been discovered recently. In this study, we focused on potassium niobate silicate (KNbSi2O7), which comprises displacement-type ferroelectric substance KNbO3 and high-covalence substance SiO2 in the structure. KNbSi2O7 single crystals with a size of 10 © 10 © 1mm3 were fabricated by the process of glass crystallization, re-melting, and slow-cooling. The polarization-electric field (P-E) curve of the KNbSi2O7 crystal was evaluated and KNbSi2O7 evidently showed ferroelectricity in the direction of c axis. The value of the spontaneous polarization was estimated to 0.11 ̄C/cm2. The dielectric permittivity was approximately 15 for both a and c axes at 1MHz, and this material was found to be a ferroelectric material with low dielectric permittivity.