Dielectric behavior of La2O3-modified 0.4(Ba0.8Ca0.2)TiO3–0.6Bi(Mg0.5Ti0.5)O3 lead-free ceramics
Dielectric behavior of La2O3-modified 0.4(Ba0.8Ca0.2)TiO3–0.6Bi(Mg0.5Ti0.5)O3 lead-free ceramics
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DOI：
10.1007/s10854-016-5365-9
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发表时间：
2016-07
期刊：
影响因子：
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通讯作者：
Xiaoqi Liu;Laijun Liu;Feifei Han;Saisai Liu;H. Xiang;L. Fang
中科院分区：
文献类型：
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作者：
Xiaoqi Liu;Laijun Liu;Feifei Han;Saisai Liu;H. Xiang;L. Fang
采用传统的混合氧化物法制备了0.4（Ba0.8Ca0.2）（1-x）La 2x/3 TiO 3 -0.6Bi（Mg0.5Ti0.5）O3（x= 0.00，0.15，0.30）陶瓷。用XRD测定了陶瓷的晶体结构。样品的介电常数随La含量的增加而降低，但介电常数的温度稳定性得到改善。对于x = 0.3，获得了在30-550 °C（在IkHz下）的温度范围内延伸的近平台介电常数700 ± 80。在93 - 353 °C的温度范围内，相应的损耗角正切tanδ ≤0.025。所有样品都表现出弛豫行为，测量频率和介电常数最大值对应的温度（Tm）符合Vogel-Fulcher关系。通过与其它材料的介电性能比较，发现前者在开发宽工作温度范围的电容器方面具有很大的吸引力。
0.4(Ba0.8Ca0.2)(1−x)La2x/3TiO3–0.6Bi(Mg0.5Ti0.5)O3(x= 0.00, 0.15, 0.30) ceramics were prepared by a conventional mixed oxide route. Crystal structure of the ceramics was determined using XRD. Dielectric constant of the samples decreases with the increase of La content, however, the temperature stability of dielectric constant was improved. For x = 0.3, a near-plateau dielectric constant 700 ± 80, extended across the temperature range, 30–550 °C (at 1 kHz) was obtained. The corresponding loss tangent, tanδ, was ≤0.025 in the temperature range from 93 to 353 °C. All samples show a relaxor behavior and measurement frequency and the temperature (Tm) corresponding to the maximum of dielectric constant follow the Vogel–Fulcher relationship. Compared the dielectric properties of the samples with other materials, the former has highly attractive for developing capacitors over a wide working temperature range.