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Relaxor ferroelectric behavior of BaBi_(4)Ti_(4)O_(15) aurivillius ceramic

Journal of Advanced Dielectrics 2013年第2期3卷 52-58页

作者： T.Badapanda R.K.Harichandan A.Mishra S.Anwar Department of Physics C.V.Raman College of Engineering BhubaneswarOdisha 752054India Department of Physics Centurion University of Technology&Management BhubaneswarOdisha 751020India Colloids&Materials Chemistry Institute of Minerals and Materials Technology BhubaneswarOdisha 751013India

aurivillius type compound BaBi_(4)Ti_(4)O_(15)(BBT)ceramic was prepared by solid state reaction route and its electrical properties were studied.X-ray diffraction(XRD)pattern showed orthorhombic structure with space group A21am confirming it to be an m=4 member of the aurivillius *** scanning electron microscope of the sintered pellet showed a plate-like morphology of grains which is a characteristic feature of the aurivillius *** temperature and frequency dependence dielectric study showed a shifting of transition temperature with frequency indicating relaxor type behavior in the *** diffuseness parameter(γ)established the relaxor nature and it was attributed to the A-site cationic *** dielectric relaxation obeyed the VogelFulcher(VF)relation and various parameters like activation energy for relaxation,freezing temperature,relaxation frequency were determined after nonlinear curve *** temperature dependence of dielectric constant at temperatures much higher and lower than Tm was analyzed by two exponential functions,which gives an idea about the production of polar clusters at high temperature and the distribution of freezing temperatures at lower *** other associated parameters were calculated by nonlinear curve fitting and their significance has been explained.

关键词： aurivillius compound diffuse phase transition relaxor ferroelectric P-E loop

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