Tailoring of ferroelectrics in (Na2O, K2O)-Nb2O5-SiO2 glass-ceramics via control the crystallization kinetics
Tailoring of ferroelectrics in (Na2O, K2O)-Nb2O5-SiO2 glass-ceramics via control the crystallization kinetics
复制标题
通过控制结晶动力学来定制 (Na2O, K2O)-Nb2O5-SiO2 玻璃陶瓷中的铁电体
DOI：
10.1016/j.cej.2021.130027
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发表时间：
2021
影响因子：
15.1
通讯作者：
Sun Zixiong
中科院分区：
文献类型：
--
作者：
Peng Xin;Pu Yongping;Du Xinyi;Ji Jiamin;Gao Pan;Zhang Lei;Sun Zixiong
系统研究了（Na_2 O，K_2 O）-Nb_2 O_5-SiO_2微晶玻璃的析晶动力学，所有样品的生长指数均大于3，表明微晶玻璃的析晶机制为体积析晶。当晶化温度选择在放热峰2处时，KNbSi 2 O 7相析出。随着Bi 2 O3的加入，由于晶化动力学的变化，晶粒尺寸从50 nm增加到500 nm左右。随着晶粒尺寸的增大，I-E曲线和P-E环均显示铁电性增强。经PFM验证，在10 kV/cm处出现极化结构。采用复阻抗法研究了微晶玻璃的导电机理。随着Bi 2 O3的引入，由于低电导率，击穿强度增加。然而，当x = 10时，大的电导率降低击穿强度。通过充放电实验计算得到的能量密度低于P-E环理论计算的能量密度，且当放电过程中慢极化占主导地位时，两者相差较大。
Crystallization kinetics of (Na2O, K2O)-Nb2O5-SiO2glass-ceramics were systematically studied in this work and the growth index of all the samples were larger than 3, demonstrating a mechanism of volume crystallization for glass-ceramics. KNbSi2O7phase was precipitated when the crystallization temperature was selected at exothermic peak2. With the addition of Bi2O3, grain size increased from 50 nm to 500 nm approximately because of the variation of crystallization kinetics. With the increasing grain size, both theI–Ecurves andP–Eloops showed an enhancement of ferroelectricity. Proved by PFM, polarization structure appeared at 10 kV/cm. Complex impedance was measured to study the conduction mechanism of glass-ceramics. With the introduction of Bi2O3, breakdown strength increased because of low conductivity. However, a large conductivity decreased breakdown strength when×= 10. Charge-discharge test was used to calculate the energy density, which was lower than the theoretical energy calculated by P–E loops, and the difference was high when slow polarization dominates in discharge.
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DOI：
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发表时间：
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期刊：
Metallurgical and Materials Transactions B
影响因子：
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