Dielectric and energy storage properties of Mn-doped Ba0.3Sr0.475 La0.12Ce0.03TiO3 dielectric ceramics
Dielectric and energy storage properties of Mn-doped Ba0.3Sr0.475 La0.12Ce0.03TiO3 dielectric ceramics
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DOI：
10.1016/j.jeurceramsoc.2016.08.002
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发表时间：
2017
影响因子：
5.7
通讯作者：
X. Ye;Y. Li;J. Bian
中科院分区：
文献类型：
--
作者：
X. Ye;Y. Li;J. Bian
用X射线衍射仪、扫描电镜、宽带介电谱仪和铁电分析仪研究了Ba_（0.3）Sr_（0.475）La_（0.12）Ce_（0.03）Ti_（1 − x）Mn_xO_3（x = 0 − 0.005）的微结构、温度和频率对介电和储能性能的影响。Mn的掺杂显著降低了介电损耗，但使部分Ce 3+被氧化成Ce 4+进入B位，形成第二相。对于Mn掺杂的组合物，可以在室温下获得极低的介电损耗（在10 kHz下为10 - 5数量级）。在低温下的弛豫机制是偶极型的未掺杂的组合物和在高温（>500 K）是由陷阱控制的交流导电，分别。Mn掺杂提高了材料的绝缘性，从而改善了材料的储能性能。当x = 0.003时，最大能量密度为0.953 J/cm 3，BDS为247 kV/cm，效率为93%。
Microstructure, temperature and frequency dependent dielectric and energy storage properties of Ba0.3Sr0.475La0.12Ce0.03Ti1−xMnxO3(x = 0 − 0.005) have been investigated with X-ray diffractometer, and scanning electron microscope, broad band dielectric spectrometer and ferroelectric analyzer. The doping of Mn substantially decreased the dielectric loss, but made some of Ce3+be oxidized to Ce4+entering into B-site, which resulted in the formation secondary phases. For the Mn-doped composition, extremely low dielectric loss (10−5order of magnitude at 10 kHz) could be obtained at room temperature. The relaxation mechanism at low temperature is of the dipole type for the undoped composition and that at high temperature (>500 K) is governed by the trap controlled ac conduction, respectively. The energy storage properties were improved by the doping with Mn due to the increase of insulation. Maximum energy density of 0.953 J/cm3could be obtained for x = 0.003 composition with the BDS of 247 kV/cm and efficiency of 93%.