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Nonlinear Dielectric Properties Of Sol-gel Derived (ba,sr)tio_3 Ceramics

机译：溶胶-凝胶衍生（ba，sr）tio_3陶瓷的非线性介电性能

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The effect of dc electric field and temperature on dielectric properties of sol-gel derived (Ba_(0.65)Sr_(0.35) )TiO_3 (BST35) ceramics were investigated. It is observed that the phase transition of BST35 sample is a weak diffusion phase transition. The value of γ characterizing the degree of diffuse transition is 1.46,1.49,1.53 and 1.51, respectively for BST35 sample measured at frequency of 100 Hz, 1 kHz, 10 kHz and 100 kHz. The results indicate that the nonlinear dielectric properties for the BST35 ceramics at room temperature is expected to be very strong. The permittivity become very high and the polarization that can be induced by even a small field can be quite large at temperature near to the transition temperature. The loss tangent values were decreased significantly at temperatures above the transition temperature. The dielectric constant was greatly suppressed under dc electric field. At room temperature (293 K) and 20 kV cm~(-1), the tunability (k) and figure of merit (FOM) were 60% and 60.
机译：研究了直流电场和温度对溶胶-凝胶衍生的（Ba_（0.65）Sr_（0.35））TiO_3（BST35）陶瓷介电性能的影响。观察到BST35样品的相变是弱扩散相变。在100 Hz，1 kHz，10 kHz和100 kHz频率下测得的BST35样品的γ值分别表示扩散转变的程度为1.46、1.49、1.53和1.51。结果表明，预计BST35陶瓷在室温下的非线性介电性能非常强。在接近转变温度的温度下，介电常数变得非常高，即使在很小的电场下也能引起极化。在高于转变温度的温度下，损耗角正切值显着降低。在直流电场下，介电常数被大大抑制。在室温（293 K）和20 kV cm〜（-1）下，可调谐性（k）和品质因数（FOM）分别为60％和60。

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