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Characterization of Ba1-xNaxTi1-xNbxO3 ceramic by dielectric spectroscopy

Bąk W.

Archives of Materials Science and Engineering

2008

Vol. 34, nr 1

5-8

Purpose: The purpose of this paper was characterization of electric properties of polycrystalline nanograin solid solution of Ba1-xNaxTi1-xNbxO3, x = 0.65 (BNTN65) within the temperature range 153 K-573 K. Design/methodology/approach: The dielectric spectroscopy method (DSM) has been applied to measure dielectric and electric parameters within frequency range from 20 Hz to 1 MHz and within the temperature range of diffused ferroelectric - paraelectric transition and above within paraelectric state. Findings: Analysis of temperature and frequency dependences of real (ε') and imaginary (ε'') parts of dielectric permittivity and electric modulus provided the new details about specific features of paraelectric properties of ceramic BNTN65 sample. They involve weak relaxational diffused processes as well as dielectric losses. Specific two steps increase of ε' values turned out to be frequency dependent and of thermal activated character. Research limitations/implications: Above specified new details of polarizability of paraelectric phase for ceramic sample should be treated as a base for new modelling approach and quantitative description of polar clusters dependence on temperature and frequency. Originality/value: For the first time, details of polarizability of paraelectric phase, which are temperature and frequency dependent in such specific manner were described.