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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Insights into the dielectric and luminescent properties of Na _(0.5)Pr_(0.003)Bi_(0.497-x)La_xTiO _3 synthesized by the Pechini method
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Insights into the dielectric and luminescent properties of Na _(0.5)Pr_(0.003)Bi_(0.497-x)La_xTiO _3 synthesized by the Pechini method

机译：Pechini方法合成的Na _（0.5）Pr_（0.003）Bi_（0.497-x）La_xTiO _3的介电和发光性质的见解

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摘要

Lead-free ferroelectric ceramics based on the Na_(0.5)Bi _(0.5)TiO_3 system, in solid solution with Pr~(3+) and La~(3+), are synthesized by the Pechini method at low temperature. The powders calcined at 700 °C are found to be below 200 nm in mean crystal size. The dielectric properties reveal a diffuse phase transition. In Na _(0.5)Bi_(0.5)TiO)3 ceramics the rhombohedral to tetragonal transition temperature (TR-T) appears near 190 °C, and the Curie temperature (T_C) at 280 °C. These transitions are shifted when Pr~(3+) and La~(3+) cations are introduced into the lattice. The ferroelectric properties are also affected, causing the remnant polarization and coercive field to diminish with the increase in La~(3+) content. In addition, the piezoelectric properties decrease in the same way with La~(3+) concentration. Finally, the red luminescence of Pr ~(3+) is improved when lanthanum concentration is increased.
机译：采用Pechini法在低温下合成了基于Na_（0.5）Bi _（0.5）TiO_3体系的无铅铁电陶瓷，其固溶体为Pr〜（3+）和La〜（3+）。发现在700℃下煅烧的粉末的平均晶体尺寸低于200nm。介电性能显示出扩散相变。在Na_（0.5）Bi_（0.5）TiO）3陶瓷中，菱形向四边形的转变温度（TR-T）出现在190°C附近，居里温度（T_C）在280°C。当Pr〜（3+）和La〜（3+）阳离子引入晶格时，这些跃迁发生位移。铁电性能也受到影响，导致残余极化和矫顽场随着La〜（3+）含量的增加而减小。另外，压电性能与La〜（3+）浓度相同。最后，当镧浓度增加时，Pr〜（3+）的红色发光得到改善。

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