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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Phase Transition in Bi-Layered Oxides with Five Perovskite Layers
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Phase Transition in Bi-Layered Oxides with Five Perovskite Layers

机译：具有五个钙钛矿层的双层氧化物的相变

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摘要

The dielectric behavior of the Bi-layered perovskite oxides Sr_2Bi_4Ti_5O_(18) and Pb_2Bi_4Ti_5O_(18) with five perovskite-like units (m = 5) was studied. A new anomaly was found at T_1 = 428 K for Sr_2Bi_4Ti_5O_(18) and 480 K for Pb_2Bi_4Ti_5O_(18), in addition to the previously reported phase transition at T_c. The dielectric constant does not show the Curie-Weiss behavior in both Sr_2Bi_4Ti_5O_(18) and Pb_2Bi_4Ti_5O_(18) crystals: the anomaly around T_c is diffuse and broad, whereas those at T_1 are clearly shoulderlike. These two isomorphous layered-oxide ferroelectrics undergo a new intermediate phase transition at T_1. The transition temperatures show a linear dependence on the ionic radii of A-site ions in these layered perovskites.
机译：研究了具有五个钙钛矿样单元（m = 5）的双层钙钛矿氧化物Sr_2Bi_4Ti_5O_（18）和Pb_2Bi_4Ti_5O_（18）的介电行为。除了先前报道的在T_c的相变之外，在S_1_2Bi_4Ti_5O_（18）的T_1 = 428 K和对于Pb_2Bi_4Ti_5O_（18）的480 K发现了新的异常。在Sr_2Bi_4Ti_5O_（18）和Pb_2Bi_4Ti_5O_（18）晶体中，介电常数均未显示居里-魏斯行为：T_c周围的异常弥散且宽广，而T_1周围的异常明显像肩。这两个同构层状氧化物铁电体在T_1处经历了新的中间相变。转变温度对这些层状钙钛矿中A位置离子的离子半径呈线性关系。

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