Abstract
Ba0.9Ca0.1Ti1−xZrxO3 (x = 0.05, 0.07 and 0.10; BCTZ5, BCTZ7, BCTZ10) lead free ceramics were prepared by solid state reaction. The phase transitional behaviour, composition, and temperature dependent electrical properties and composition dependent ferroelectric properties were investigated. XRD analysis at room temperature and Rietveld refinement revealed a structural transformation from tetragonal to rhombohedral with enhancement of Zr content in the BCT matrix. Study of impedance spectra of these ceramics confirmed a heterogeneous electrical microstructure where the conduction and relaxation mechanisms originated from grain boundaries and grains. The ceramics depicted non Debye type of relaxation. Dielectric properties illustrated a decrease in Curie temperature and a diffused phase transition behavior with increase in Zr content. The conducting species changed from V′o to V′′o on ferroelectric phase transition in grain interiors. Saturated hysteresis loops confirmed the ferroelectric nature of the ceramics.
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