Bussmann-Holder Annette, Kim Tae Hyun, Lee Byoung Wan, Ko Jae-Hyeon, Majchrowski Andrzej, Soszyński Andrzej, Roleder Krystian
Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany.
J Phys Condens Matter. 2015 Mar 18;27(10):105901. doi: 10.1088/0953-8984/27/10/105901. Epub 2015 Feb 24.
PbHfO(3) is investigated theoretically and experimentally with respect to possible precursor effects starting in the paraelectric phase far above the cubic to tetragonal phase transition temperature. The theoretical modeling within the polarizability model predicts a giant softness of the system with spatially large polar and antiferrodistortive domain formation which compete with each other. These predictions are substantiated by the experiments, where the softness and the precursor effects are confirmed by birefringence, dielectric permittivity measurements and elastic properties by Brillouin scattering. The intermediate phase is found to have the polar nature confirmed by P-E hysteresis loop measurements, which is another manifestation of the competition between interrelated instabilities, namely a polar one and an antiferroelectric one.
针对从远高于立方相向四方相转变温度的顺电相开始的可能前驱体效应，对PbHfO(3)进行了理论和实验研究。极化率模型内的理论建模预测，该系统具有巨大的柔软性，会形成空间上较大的极性和反铁电畸变畴，且它们相互竞争。这些预测得到了实验的证实，实验中通过双折射、介电常数测量以及布里渊散射测量弹性性质，证实了柔软性和前驱体效应。通过P-E滞后回线测量发现中间相具有极性性质，这是相关不稳定性（即极性不稳定性和反铁电不稳定性）之间竞争的另一种表现。
