The electrocaloric effect of Ba1-xLaxTi0.9Sn0.1O3 ceramics with excellent temperature stability near room temperature
The electrocaloric effect of Ba1-xLaxTi0.9Sn0.1O3 ceramics with excellent temperature stability near room temperature
复制标题
近室温下具有优异温度稳定性的Ba1-xLaxTi0.9Sn0.1O3陶瓷的电热效应
DOI：
10.1016/j.ceramint.2022.02.250
复制
发表时间：
2022
影响因子：
5.2
通讯作者：
Yongping Pu
中科院分区：
文献类型：
--
作者：
Ning Xu;Qi Liu;Zixing Sun;Jiahui Ma;Yuxin Luo;Yongping Pu
采用传统固相反应法制备了ba1 - xlaxti0.9 sn0.1 o3 （x= 0,0.006, 0.007, 0.008）陶瓷。详细分析了La3+对材料相、介电性能、铁电性能和电热效应的影响。细化结果表明，在室温下，所有陶瓷都是多相共存的，包括立方相、四方相和正交相。随着La3+的增加，极性相减少，非极性相增加，这是绝热温度变化减小的主要原因（ΔT）。介电性能和铁电性能分析表明，La3+的引入增强了材料的扩散相变。这也意味着极性纳米区（pnr）可能会形成。从而提高了ba1 - xlaxti0.9 sn0.1 o3陶瓷在常温附近宽温度范围内的温度稳定性。同时，pnr为改进ECE提供了额外的熵。在60 kV/cm条件下，得到higherΔT= 0.88 K，在298 K - 378 K温度范围内具有良好的温度稳定性。La3+的掺杂还提高了电热强度的电场阈值（ΔTmax/ΔE），稳定了theΔTmax/ΔEunder较高的电场，有利于提高较高电场下的ECE，为促进ECE的实际应用提供了另一种可能的解决方案。
The Ba1-xLaxTi0.9Sn0.1O3ceramics (x= 0, 0.006, 0.007, 0.008) were prepared by the traditional solid-state reaction method. The influence of La3+on the phase, dielectric properties, ferroelectric properties, and electrocaloric effect (ECE) was analyzed in detail. The results of refinement show that all ceramics are multiphase coexistence at room temperature, including the cubic phase, the tetragonal phase, and the orthogonal phase. With the increase of La3+, the polar phases decrease but the non-polar phase increases, which is the main reason for the decline in adiabatic temperature change (ΔT). The analysis of dielectric properties and ferroelectric properties demonstrate that the diffuse phase transition is strengthened by introducing La3+. It also means that polar nanoregions (PNRs) might be formed. Therefore, the temperature stability of the Ba1-xLaxTi0.9Sn0.1O3ceramics in a wide temperature range near room temperature is improved. Simultaneously, the PNRs provide additional entropy to improve ECE. A higherΔT= 0.88 K is obtained under 60 kV/cm forx= 0.007, which also possesses excellent temperature stability in the temperature range of 298 K–378 K. The doping of La3+also improves the electric field threshold of the electrocaloric strength (ΔTmax/ΔE) and stabilizes theΔTmax/ΔEunder a higher electric field, which is conducive to improving ECE under a higher electric field and providing another possible solution for promoting the practical application of ECE.