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Influence of sintering temperature on properties of BNKLLT–6 wt% BCTZ binary lead-free piezoelectric ceramic prepared through the solid-state combustion technique

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ABSTRACT In this work, a new binary 94 wt%[Bi0.5(Na0.68K0.22Li0.1)0.5TiO3 + 0.10 wt% of La2O3]–6 wt% [(Ba0.85Ca0.15)(Ti0.90Zr0.10)O3] [BNKLLT–6 wt% BCTZ] ceramic was fabricated by the solid-state combustion technique and glycine was… Click to show full abstract

ABSTRACT In this work, a new binary 94 wt%[Bi0.5(Na0.68K0.22Li0.1)0.5TiO3 + 0.10 wt% of La2O3]–6 wt% [(Ba0.85Ca0.15)(Ti0.90Zr0.10)O3] [BNKLLT–6 wt% BCTZ] ceramic was fabricated by the solid-state combustion technique and glycine was used as the fuel. The effect of sintering temperature in the range of 1075–1175 °C for 2 h on phase evolution, microstructure and electrical properties was investigated. The phase formation exhibited a coexistence structure between rhombohedral and tetragonal at low sintering temperature. As the sintering temperature increased, the phase formation changed to pseudo-cubic phase. The average grain size of the ceramics was increased with the increasing sintering temperature. Density, ϵr, ϵSA and TFA of BNKLLT–6 wt% BCTZ ceramics increased while the TSA decreased when the sintering temperature increased up to 1125 °C, while after this temperature the opposite trends occurred. At a sintering temperature of 1125 °C, the BNKLLT-6 wt% BCTZ sample showed the highest theoretical density (95.8%), maximum dielectric constant ϵSA (5278), highest d33 (227 pC/N) and fair ferroelectric properties (Pr = 24.5 µC/cm2 and Ec = 15.45 kV/cm).

Keywords: solid state; phase; temperature; sintering temperature; bnkllt bctz; state combustion

Journal Title: Phase Transitions
Year Published: 2017

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