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首页> 外文期刊>Journal of Materials Science >Effect of Zr+4 ion substitution on the structural, dielectric and electrical properties of Sr5LaTi3Nb7O30 ceramics
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Effect of Zr+4 ion substitution on the structural, dielectric and electrical properties of Sr5LaTi3Nb7O30 ceramics

机译：Zr + 4 离子取代对Sr5 LaTi3 Nb7 O30 陶瓷的结构，介电和电学性能的影响

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摘要

Polycrystalline Zr-modified Sr5LaTi3Nb7O30 compound was prepared by a high-temperature solid-state reaction technique. X-ray structural analysis confirmed the formation of compound in an orthorhombic system at room temperature. Detailed studies of the dielectric parameters (dielectric constant and tangent loss) as a function of frequency (1–100 kHz) at different temperature (150 to 650 K) were carried out. It was found that as Zr+4 concentration increases in Sr5LaTi3 − x ZrxNb7O30, the value of dielectric constant decreases. These compounds show ferroelectric-paraelectric phase transition of diffuse type at 283, 305 and 320 K for x = 0, 1 and 2 respectively. The transition temperature (T c) shifts towards higher temperature and maximum dielectric constant value (εmax) decreases with increasing Zr+4 concentration for x = 0 to x = 2. When Ti+4 cations were completely replaced by Zr+4 cations (i.e., Sr5LaZr3Nb7O30), the compound does not show any phase transition. Impedance-spectroscopic studies provided an insight into the electrical properties and understanding of relaxation behavior of the material. Measurement of electrical conductivity as a function of temperature suggests that the compounds have a negative temperature coefficient of resistivity (NTCR) with a typical semiconductor behavior.
机译：通过高温固相反应技术制备了多晶的Zr修饰的Sr5 LaTi3 Nb7 O30 化合物。 X射线结构分析证实了室温下正交晶系中化合物的形成。在不同温度（150至650 K）下，对介电参数（介电常数和切线损耗）随频率（1–100 kHz）的变化进行了详细研究。发现随着Sr5 LaTi3-x ZrxNb7 O30 中Zr + 4 浓度的增加，介电常数值减小。这些化合物分别在x = 0、1和2的283、305和320 K处显示出扩散型铁电-顺电相变。当x = 0到x = 2时，转变温度（T c ）移向更高的温度，并且最大介电常数值（εmax）随着Zr + 4 浓度的增加而降低。 Zr + 4 阳离子（即Sr5 LaZr3 Nb7 O30 ）完全取代了4 阳离子，该化合物不显示任何相过渡。阻抗谱研究提供了对电学性质的了解，并了解了材料的弛豫行为。电导率随温度变化的测量表明，这些化合物具有典型的半导体特性，其电阻率温度系数（NTCR）为负。

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