Authors: S K Ghosh S K Deshpande S K Rout
Publish Date: 2016/09/02
Volume: 28, Issue: 2, Pages: 1336-1351
Abstract
Lead free scandium doped barium zirconate titanate Ba1−xSc2x/3Zr03Ti07O3 abbreviated as BScZT x = 002 004 006 008 010 ceramics were prepared by the conventional solid state reaction route and their structural microstructural and electrical properties were investigated experimentally Xray diffraction and Rietveld refinement analysis are indexed by considering cubic symmetry having space group Pm3 m Scandium ion Sc3+ substitution induced Asite vacancies and distortion in three dimensional cationoxygen networks leads to disorder in the local symmetry as identified in Raman spectra The microstructural image shows formation of smaller grains of irregular shape and sizes along with aggregative characteristic with successive increase in Sc concentration Lorentz type quadratic behavior in dielectric dispersion follows modified Curie–Weiss law and indicates a relaxor behavior with diffuse type of phase transition A nonDebye type of relaxation behavior is observed in these materials Variation of relaxation strength and diffuse parameters obey the Vogel–Fulcher relation The ac conductivity highlights the hopping of bound charge carriers between the localized environment at lower temperature and translation hopping at higher temperature is modeled through universal dielectric responseSKG and SKR are gratefully acknowledged the financial support of the major research project F No 530/3/DRS/2011SAPI funded by UGC Govt of India under SAP research program and the financial support through DSTFIST program All authors acknowledge the UGCDAE Consortium for Scientific Research Mumbai Centre for low temperature dielectric measurements
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