期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 737, 期 -, 页码 464-476出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.12.121
关键词
Co-substitution; Grain size; Electromechanical; Piezoelectric; Elastic; Diffuse phase transition; Ferroelectric
资金
- UGC
- DST
- DRDO at University of Hyderabad
- government of Yemen
In this paper, the polycrystalline ceramics Ba(1-x) (La, Na)(x)TiO3 0 <= x <= 0: 08 were synthesized by microwave assisted heating of the starting materials. Room temperature X-ray diffraction along with Rietveld refinement analysis confirmed the formation of single-phase polycrystalline compound with the tetragonal crystal structure. A dense microstructure with several grains having different size distribution throughout the sintered pellet has been observed. The incorporation of La3+ and Na+ ions in BaTiO3 enhanced the room temperature relative permittivity. The studies of the temperature dependence of dielectric permittivity indicate ferroelectric-paraelectric phase transition with a clear shift in the Curie temperature (Tc) of BaTiO3 towards lower temperature side on co-substitution. The co-substituted sample with x = 0.08 exhibited superior dielectric constant (epsilon' = 4226) with low dielectric loss (tan delta = 0.0113) which is highly essential for the fabrication of ceramic capacitors. Resonance and antiresonance characteristics of impedance and phase for poled Ba(1-x)(La, Na)(x)TiO3 samples have been investigated in the frequency range of 300 kHz-1 MHz. Based on IRE standards for piezoelectric ceramics the piezoelectric response has been discussed. The room temperature P-E loop is investigated at an applied electric field of 80 kV/cm at 33 Hz frequency using Precision Premier II. (C) 2017 Elsevier B.V. All rights reserved.
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