Effect of holmium substitution on structural and electrical properties of barium zirconate titanate ferroelectric ceramics

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• 作者：Priyanka A. Jha ; A.K. Jha
• 关键词：A. Powders ; solid state reaction ; C. Dielectric properties ; D. BaTiO3 and titanates
• 刊名：Ceramics International
• 出版年：May, 2014
• 年：2014
• 卷：40
• 期：4
• 页码：5209-5216
• 全文大小：1311 K

文摘

The holmium substituted Ba_1鈭?x/2Ho_xZr_0.025Ti_0.975O₃ (x=0.01, 0.02, 0.025, 0.05) compositions were synthesized by the solid state reaction technique. The synthesized specimens were characterized for their structural and electrical properties using X-ray diffractometer, scanning electron microscopy, impedance analyzer and loop tracer. Phase analysis shows the formation of secondary phase Ho₂Ti₂O₇ for Ho鈮?.5 mol% substitution. The microstructural investigation shows that the holmium substitution significantly reduces the grain size. The substitution of holmium increases the Curie temperature for x鈮?.02 whereas Curie temperature decreases for x鈮?.025. The maximum dielectric constant at transition temperature is observed for x=0.02. The solubility limit is 2 mol% and for x鈮?.025 some of the holmium atoms enter B-sites and forms the secondary phase. An increase is observed in the coercive field of the specimens with the increasing holmium content.