IMPEDANCE SPECTROSCOPY STUDY OF NaCa2Nb5O15 CERAMICS

被引：4

作者：

Behera, Banarji ^{[1
]}

Nayak, P. ^{[2
]}

Choudhary, R. N. P. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Phys & Meteorol, Kharagpur 721302, W Bengal, India

[2] Sambalpur Univ, PG Dept Phys, Burla 768019, Sambalpur, India

来源：

MODERN PHYSICS LETTERS B | 2009年 / 23卷 / 01期

关键词：

Ceramics; X-ray diffraction; dielectric properties; impedance properties; DIELECTRIC CERAMICS; PHASE-TRANSITION; TUNGSTEN BRONZE; AC CONDUCTIVITY; RELAXATION; GLASSES; CONDUCTORS; BEHAVIOR; SPECTRA; SYSTEM;

D O I：

10.1142/S0217984909017765

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Polycrystalline sample of Na5Ca2NbO15 was prepared by a high-temperature solid-state reaction technique. Preliminary X-ray structural analysis exhibits the orhorhombic crystal structure of the compound at room temperature. Detailed dielectric studies of NaCa2Nb5O15 over a wide range of temperature (30-500 degrees C) and frequency (10(2)-10(6) Hz) did not show any dielectric anomaly (or ferroelectric phase transition) as oberved in other members of the tungsten bronze structural family. However,Complex impedance and type of relaxation process in the compound. Complex modulus spectrum shows only grain contribution in the compound. Electric modulus analysis suggests that a possible hopping mechanism is evident for electrical transport processes in the system. Studies of AC conductivity with frequency suggest that the material obeys Jonscher's universal power law.

引用

页码：97 / 109

页数：13

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