• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Effect of Bi-substitution into the A-site of multiferroic La0.8Ca0.2FeO3 on structural, electrical and dielectric properties
【24h】

Effect of Bi-substitution into the A-site of multiferroic La0.8Ca0.2FeO3 on structural, electrical and dielectric properties

机译：双取代在结构，电气和介电性能下的多二二种LA0.8CA0.2FEO3的现场的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

(La _(0.8) Ca _(0.2) ) _(1? x ) Bi _( x ) FeO _(3) ( x = 0.00, 0.05, 0.10, 0.15 and 0.20) (LCBFO) multiferroic compounds have been prepared by the sol–gel method and calcined at 800 °C. X-ray diffraction results have shown that all samples crystallise in the orthorhombic structure with the Pnma space group. Electrical and dielectric characterizations of the synthesized materials have been performed using complex impedance spectroscopy techniques in the frequency range from 100 Hz to 1 MHz and in a temperature range from 170 to 300 K. The ac-conductivity spectra have been analysed using Jonscher's power law σ ( ω ) = σ _(dc) + Aω ~( s ) , where the power law exponent ( s ) increases with the temperature. The imaginary part of the complex impedance ( Z ′′) was found to be frequency dependent and shows relaxation peaks that move towards higher frequencies with the increase of the temperature. The relaxation activation energy deduced from the Z ′′ vs. frequency plots was similar to the conduction activation energy obtained from the conductivity. Hence, the relaxation process and the conduction mechanism may be attributed to the same type of charge carriers. The Nyquist plots ( Z ′′ vs. Z ′) at different temperatures revealed the appearance of two semi-circular arcs corresponding to grain and grain boundary contributions.
机译：（LA _（0.8）Ca _（0.2））_（1？x）Bi _（x）Feo _（3）（x = 0.05,0.10,0.15和0.20）（LCBFO）通过溶胶 - 凝胶法并在800℃下煅烧。 X射线衍射结果表明，所有样品在与PNMA空间组中的正交结构中结晶。已经使用从100Hz至1MHz的频率范围内的复杂阻抗谱技术和170至300k的温度范围内进行了合成材料的电气和介电特征。使用Jonscher的权力法Σ分析了交流电导率光谱（ω）=Σ_（dc）+aω〜（s），其中功率法指数随温度的增加。发现复杂阻抗（Z''）的虚部被发现为频率依赖性，并且显示随着温度的增加而移动朝向更高频率的松弛峰。从Z''与频率图中推断的松弛激活能量类似于从电导率获得的导通激活能量。因此，松弛过程和传导机构可以归因于相同类型的电荷载波。不同温度的奈奎斯特图（Z''Z'）揭示了与晶粒和晶界相对应的两个半圆弧的外观。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号