Abstract
A functionally graded perovskite material with varying Ba/Sr ratio was known to have a broad transition temperature and as a result it shows a low temperature coefficient and high dielectric constant in a wide temperature range. A multi-layered barium/ strontium titanate functionally graded material was fabricated. Optical/scanning electron microscopy, energy dispersive spectrocsopy, and X-ray diffractometer were used for microstructural, chemical, and phase analysis, respectively. An impedance/gain-phase analyzer was used for dielectric constant measurement. The microstructure and dielectric property of BaTiO 3 -SrTiO 3 system display various gradient distributions corresponding to constitutional change. The average grain size of Ba 1-x Sr x TiO 3 phase was reduced as increasing the volume fraction of strontium. The dielectric properties of BaTiO 3 SrTiO 3 functionally graded materials were discussed in terms of microstructure and chemical composition.
Published Version
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