Characterization of Mg0.8Zn0.2TiO3 Prepared via Liquid Phase Sintering

Abstract

Mg0.8Zn0.2TiO3 powder was synthesized by dissolved method and calcined at 550 °C for 4 hours. The powder exhibited single phase of Mg0.8Zn0.2TiO3 and nano size particle. Sintered pellet samples were prepared by compacting calcined powder which contains 4wt% B2O3 (MZTA), 4wt% Bi2O3 (MZTB) as liquid additive and non-additive sample (MZTC). Phase identification and its percentage were analyzed based on XRD pattern using Rietveld method. The result shows major phase Mg0.8Zn0.2TiO3 ranging from 72.83% for MZTA, 77.9% for MZTB and 82.61% for MZTC. Furthermore, minor phases were identified as Mg2TiO4 and other trace compound Mg3TiO2(BO3)2 for boron additive. Sintered pellet densities were determined by Archimedes method indicate that Bi2O3 additive has the most effective for densification. Microstructure characterization using SEM show that MZTB possesses the largest grain size ≈3.4µm followed by MZTA 2.3µm and MZTC 1.78µm. Dielectrics characterizations within frequency 1 Hz – 32 MHz exhibited space charge polarization characteristic for frequency <1 kHz, however for frequency >1 kHz showed frequency independence of dipolar polarizations and low dielectric loss having εr~17.