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        Grain Size Effect on the Electric Properties of Gd/Nb Substituted Barium Titanate-Lithium Ferrite at High Frequency Region

        Ganapathi Rao Gajula,Lakshmi Rekha Buddiga 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.1

        Gd/Nb substituted BaTiO3 –Li 0.5 Fe 2.5 O 4 (BLF) composite ceramics are prepared using conventional solid state technique. The structural properties like XRD to identify the structure of composites, morphological studies to describe surface morphology, estimate grain size of the composites and electric properties at high frequencies are investigated. The XRD reveals Gd/Nb substituted BLF composite confirm the tetragonal crystal structure without phase change. The morphology studies confirm that the BLF composite exhibit larger grains which are surrounded by smaller grains in different angular shapes with low pores. The impedance of all composites shows maximum followed by complex behaviour which is due to relaxation of domain motion. The capacitance of BLF composite decrease by doping with Gd/Nb in BLF over the frequency region between 1 MHz and 1 GHz. The conductance peak of composite shifted towards lower and higher frequencies due to substitution of Gd/Nb. The real part of electric modulus (M′) shows complex behaviour beyond 1 GHz. The imaginary part of Electric Modulus (M′′) of all composites are frequency independent from 1 MHz to 1 GHz.

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