Microstructure and Dielectric Properties of SrTiO_3-PbTiO_3-CaTiO_3 Ceramics

概要

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The electrical properties and microstructures of SrTiO_3-PbTiO_3-CaTiO_3-Bi_2O_3-TiO_2 systems were investigatd. It was found that the materials had two inhomogeneous regions, called "grain core-grain shell", by field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) observations. The dielectric constant showed two peaks. The dielectric constant at temperatures below 0℃ decreased, whereas that at temperatures above 100℃ increased slighly, under DC biers field. D-E loops revealed that the ferroelectric state existed at temperatures below 0℃, and the paraelectric-like state existed at temperatures above 100℃. The observed frequency dependence and aging phenomena showed that this material was a relaxor. A relationship between the electrical properties and microstructure has been proposed.
社団法人応用物理学会の論文
1996-09-30