Kajewski Dariusz, Jankowska-Sumara Irena, Ko Jae-Hyeon, Lee Jeong Woo, Naqvi Syed Furqan Ul Hassan, Sitko Rafał, Majchrowski Andrzej, Roleder Krystian
Institute of Physics, University of Silesia, ul. 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
Institute of Physics, Pedagogical University, ul. Podchorążych 2, 30-084 Kraków, Poland.
Materials (Basel). 2022 Jun 8;15(12):4077. doi: 10.3390/ma15124077.
Lead zirconate PbZrO has been the subject of research interest for several dozen years. Recently, even its antiferroelectric properties have started to be questioned, and many researchers still deal with the so-called intermediate phase below Curie temperature (T), whose existence is not fully understood. It turns out that PbZrO doped with Nb exhibits below T phases with complex domain structures. One of them undergoes self-organization taking place at a constant temperature, and transforms, after several minutes, into a lower phase. This isothermal transition was investigated through dielectric, pyroelectric current and Raman scattering measurements. Discontinuities accompanied it in the permittivity and pyroelectric current. The obtained Raman spectra proved that those discontinuities are strictly linked with the isothermal transition between two intermediate phases. The ordering process in lead sublattice stimulated by thermal fluctuations is discussed as a driving force for this peculiar phenomenon.
锆酸铅（PbZrO）几十年来一直是研究热点。最近，甚至其反铁电特性也开始受到质疑，许多研究人员仍在研究居里温度（T）以下的所谓中间相，其存在尚未完全明了。结果表明，掺杂铌的PbZrO在T以下呈现出具有复杂畴结构的相。其中之一在恒定温度下发生自组织，并在几分钟后转变为更低的相。通过介电、热电流和拉曼散射测量研究了这种等温转变。介电常数和热电流出现了不连续性。所得拉曼光谱证明，这些不连续性与两个中间相之间的等温转变密切相关。讨论了由热涨落激发的铅亚晶格中的有序过程，将其作为这一特殊现象的驱动力。
