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Dielectric Properties and Relaxation of BiO⋅5NaO⋅5tio3–Linbo3Lead-Free Ceramics

Author(s):

Varsha Sao , Dr.C.V.Raman University Bilsapur C.G.

Keywords:

Diffusion Phase Transitions; Dielectric Properties; Relaxor Characteristics

Abstract

A new member of lead-free piezoelectric ceramics of the BNT-based group, (1 – x)Bi0⋅5Na0⋅5TiO3–xLiNbO3(x=0.002,0.004,0.01,0.014, was prepared by conventional solid state reaction and its dielectric properties and relaxation was investigated. X-ray diffraction showed that LiNbO3diffused into the lattice of Bi0⋅5Na0⋅5TiO3 to form a solid solution with perovskite-type structure. A diffuse character was proved by the linear fitting of the modified Curie–Weiss law. The temperature dependence of dielectric constant at different frequencies revealed that the solid solution exhibited relaxor characteristics different from classic relaxor ferroelectrics. The samples with x = 0⋅002 and 0⋅006 exhibited obvious relaxor characteristics near the low temperature dielectric abnormal peak, Tf, and the samples with x = 0⋅010 and 0⋅014 exhibited obvious relaxor characteristics between room temperature and Tf. The mechanism of relaxor behaviour was also discussed according to the macro-domain to micro-domain transition theory.

Other Details

Paper ID: IJSRDV3I31028
Published in: Volume : 3, Issue : 3
Publication Date: 01/06/2015
Page(s): 1374-1376

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