Chauhan Vidhi, Wang Bi-Xia, Ye Zuo-Guang
Department of Chemistry and 4D Labs, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.
Materials (Basel). 2023 Jun 2;16(11):4144. doi: 10.3390/ma16114144.
Lead hafnate (PbHfO) has attracted a lot of renewed interest due to its potential as antiferroelectric (AFE) material for energy storage. However, its room temperature (RT) energy-storage performance has not been well established and no reports on the energy-storage feature of its high-temperature intermediate phase (IM) are available. In this work, high-quality PbHfO ceramics were prepared via the solid-state synthesis route. Based on high-temperature X-ray diffraction data, the IM of PbHfO was found to be orthorhombic, Imma space group, with antiparallel alignment of Pb ions along the [001] directions. The polarization-electric field (P-E) relation of PbHfO is displayed at RT as well as in the temperature range of the IM. A typical AFE loop revealed an optimal recoverable energy-storage density () of 2.7 J/cm, which is 286% higher than the reported data with an efficiency (η) of 65% at 235 kV/cm at RT. A relatively high value of 0.7 J/cm was found at 190 °C with an η of 89% at 65 kV/cm. These results demonstrate that PbHfO is a prototypical AFE from RT up to 200 °C, making it a suitable material for energy-storage applications in a wide temperature range.
铪酸铅（PbHfO）因其作为储能反铁电（AFE）材料的潜力而重新引起了人们的广泛关注。然而，其室温（RT）储能性能尚未得到充分确立，且关于其高温中间相（IM）储能特性的报道也未见。在本工作中，通过固态合成路线制备了高质量的PbHfO陶瓷。基于高温X射线衍射数据，发现PbHfO的IM为正交晶系，空间群为Imma，Pb离子沿[001]方向反平行排列。展示了PbHfO在室温以及IM温度范围内的极化-电场（P-E）关系。一个典型的AFE回线显示出最佳可恢复储能密度（）为2.7 J/cm³，这比报道的数据高286%，在室温下235 kV/cm时效率（η）为65%。在190℃时发现相对较高的储能密度值为0.7 J/cm³，在65 kV/cm时η为89%。这些结果表明，PbHfO从室温到200℃都是典型的AFE，使其成为在宽温度范围内适用于储能应用的材料。
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