摘要
我们准备了(1x ) 用一个常规二拍子的圆舞的 CaTiO <sub>3</sub>-xLaAlO<sub>3</sub>(0 x 1 ) 微波电介质陶艺固态反应方法，和陶艺的调查微波电介质性质以 A/B-site 离子参数。例如离子的 polarizability， A 地点契约原子价，并且离子的扰乱爱奥尼亚参数被连接到微波电介质性质。作为 LaAlO <sub>3</sub> 内容 x 在(1x ) CaTiO <sub>3</sub>-xLaAlO<sub>3</sub> 陶艺从 0.3 ～ 0.7 增加了，绝缘的常数逐渐地减少了，它被归因于 polarizability 偏差的减少和扰乱的阳离子的抑制。当因为 A 地点阳离子契约原子价的增加， LaAlO <sub>3</sub> 的内容增加了，反响的频率的温度系数减少了。优秀因素价值(Q 潳 ? 敧 ?
We prepared (1-x)CaTiO3-xLaAlO3 (0 ≤x≤ 1) microwave dielectric ceramics using a conventional two-step solid-state reaction method,and investigated microwave dielectric properties of the ceramics in terms of A/B-site ionic-parameters.Ionic-parameters such as ionic polarizability,A-site bond valence,and ionic rattling were linked to the microwave dielectric properties.As the LaAlO3 content x in the (1-x)CaTiO3-xLaAlO3 ceramics increased from 0.3 to 0.7,the dielectric constant gradually decreased,which was attributed to the decrease of polarizability deviation and suppression of the cation rattling.The temperature coefficient of the resonant frequency decreased as the content of LaAlO3 increased because of the increase of A-site cation bond valence.The quality factor value (Q × f) increased as LaAlO3 content increased because of the enhancement of the order degree of B-site cation.A significant deterioration of the temperature coefficient of the resonant frequency and Q ×fvalue was observed at the composition x =0.5.These decreases were attributed to a phase transition from orthorhombic crystal (for x ≤ 0.5) to rhombohedral crystal (for x ＞ 0.5).
