Investigation of Some Structural and Mechanical Properties of Ba<sub>0.5</sub>Ca<sub>x</sub>Sr<sub>0.5-x</sub>TiO<sub>3</sub>Ceramics
Investigation of Some Structural and Mechanical Properties of Ba<sub>0.5</sub>Ca<sub>x</sub>Sr<sub>0.5-x</sub>TiO<sub>3</sub>Ceramics作者机构：Physics Department Faculty of Science Minufiya University Shibin El Kom Egypt
出 版 物：《Crystal Structure Theory and Applications》 (晶体结构理论与应用（英文）)
年 卷 期：2013年第2卷第3期
页 面：132-138页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：BST Ceramics BCST Ceramics Phase Transition Ultrasonic Attenuation SEM
摘 要：Ba0.5CaxSr0.5-xTiO3 (BCST) ceramics, where x = 0, 0.1, 0.2, 0.3 and 0.4, were prepared by the conventional solid state reaction technique. X-ray diffraction (XRD) analysis confirmed the formation of BST perovskite phase structure besides some calcium oxide peaks for samples with high Ca content, x. Scanning electron microscopy (SEM) results confirmed the XRD results, i.e., as x increased, the average grain size decreased. Energy dispersive X-ray (EDX) analysis verified the increase of the amount of Ca element with increasing of its content. Mechanical properties such as ultrasonic attenuation, longitudinal wave velocity, and longitudinal elastic modulus were studied by an ultrasonic pulse echo technique at 2 MHz frequency. Investigations of ceramic microstructures and mechanical properties showed their dependence on composition. Increasing of Ca content resulted in a decrease in bulk density and ultrasonic attenuation and an increase in porosity, velocity, and modulus. High temperature ultrasonic studies showed, in addition to Curie phase transition, three or more relaxation peaks and its origin was investigated.
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