Abstract
Abstract This study investigated how extra Ba 2+ and two-step sintering affect the crystal structure, microstructure, and dielectric properties of (Ba, Ca)(Ti, Zr)O 3 (BCTZ). XRD results indicate that no secondary phase formed in any of the BCTZ samples after sintering. Raman spectra reveal that Ca 2+ ions were pushed from the Ba-site to the Ti-site when extra Ba 2+ was added after sintering. The Curie temperatures of all BCTZ samples decreased due to the smaller tetragonality caused by the addition of extra Ba 2+ . SEM micrographs revealed that two-step sintering decreased the grain size from 5.0 μm to 0.5 μm compared with normal sintering. Furthermore, samples with fine-grain microstructures exhibited flat curves for the temperature coefficient of capacitance.
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