(Bi1/2Na1/2)TiO3 (BNT) is one of the candidates for lead-free piezoelectric ceramics. Recently, we found that the depolarization temperature Td of BNT could be increased by approximately 40 °C–80 °C with a quenching treatment after the sintering. To elucidate the mechanism, high-energy synchrotron X-ray powder diffraction data were collected in SPring-8 to analyze their crystal structures in detail. In the case of a quenched BNT-based sample, Bi ions displaced more to the off-center position of the A-site in a perovskite structure with a more ordered structure. The increase in rhombohedral distortion then affects the Td elevation in the quenched sample.

中文翻译：

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淬火(Bi _1/2 Na _1/2 )TiO ₃基陶瓷去极化温度与晶格畸变的相关性

(Bi1/2Na1/2)TiO3 (BNT) 是无铅压电陶瓷的候选材料之一。最近，我们发现在烧结后进行淬火处理，BNT 的去极化温度 Td 可以提高大约 40°C-80°C。为了阐明机理，在SPring-8中收集了高能同步加速器X射线粉末衍射数据，以详细分析它们的晶体结构。在淬火的基于 BNT 的样品的情况下，Bi 离子更多地位移到钙钛矿结构中 A 位的偏心位置，具有更有序的结构。菱形畸变的增加会影响淬火样品中的 Td 升高。