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Distinct temperature behavior of the local structure of (1‐x)PbTiO3‐xBiNi0.5Ti0.5O3 at the morphotropic phase boundary
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-04-26 , DOI: 10.1002/jrs.5885 Irina Margaritescu 1 , Kaustuv Datta 1 , Jun Chen 2 , Boriana Mihailova 1
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-04-26 , DOI: 10.1002/jrs.5885 Irina Margaritescu 1 , Kaustuv Datta 1 , Jun Chen 2 , Boriana Mihailova 1
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Temperature‐dependent Raman spectroscopy was used to study the composition‐ and temperature‐driven structural transformations in the (1‐x)PbTiO3‐xBiNi0.5Ti0.5O3 solid solution, exhibiting a morphotropic phase boundary (MPB) at xMPB∼0.55 and a relatively high Curie temperature (TC∼680 K at xMPB). The analyses were carried out on ceramic samples, covering a wide temperature range across TC (100–1100 K) and several compositions across xMPB (0–0.70). The results reveal the presence of local ferroic distortions in the paraelectric phase of all compounds and strong composition‐induced enhancement of the order‐disorder phenomena across the para‐to‐ferroelelctric phase transition. The MPB compound is distinct by the absence of any temperature dependence of the wavenumber of the lowest‐energy A‐cation vibrational mode as well as by an equal dynamical weight of BO6 octahedral distortions and tilts below TC. The former indicates that at the MPB, the local‐scale structural polarity associated with the A site is purely composition‐driven, while the latter reveals competing local‐scale polar and antiferodistortive orders related to the B‐site sublattice in the ferroelectric state, which do not vanish but become energetically indistinguishable in the paraelectric state.
中文翻译：
（1-x）PbTiO3-xBiNi0.5Ti0.5O3的局部同相边界上的不同温度行为
温度依赖性拉曼光谱被用来研究在（1-的与组成和温度驱动结构变换X）的PbTiO 3 - X BINI 0.5的Ti 0.5 ø 3固溶体，在表现出型相界（MPB）X MPB〜 0.55和相对高的居里温度（Ť ç ~680处的K X MPB）。对陶瓷样品进行了分析，涵盖了T C（100–1100 K）的宽温度范围和x MPB的几种成分（0–0.70）。结果表明，所有化合物的顺电相中都存在局部铁性畸变，并且在顺铁电相变过程中强烈诱导了成分诱导的无序现象的增强。MPB化合物的独特之处在于，它与最低能量的A-阳离子振动模式的波数不存在任何温度相关性，并且具有等于BO 6八面体形变和小于T C的倾斜的同等动态权重。前者表明在MPB中，与A位点相关的局部尺度的结构极性是纯粹由成分驱动的，而后者则揭示了与铁电态中B位子晶格有关的局部尺度的极性和反铁电体竞争顺序。不会消失，但在顺电状态下在能量上无法区分。
更新日期：2020-04-26
中文翻译：
（1-x）PbTiO3-xBiNi0.5Ti0.5O3的局部同相边界上的不同温度行为
温度依赖性拉曼光谱被用来研究在（1-的与组成和温度驱动结构变换X）的PbTiO 3 - X BINI 0.5的Ti 0.5 ø 3固溶体，在表现出型相界（MPB）X MPB〜 0.55和相对高的居里温度（Ť ç ~680处的K X MPB）。对陶瓷样品进行了分析，涵盖了T C（100–1100 K）的宽温度范围和x MPB的几种成分（0–0.70）。结果表明，所有化合物的顺电相中都存在局部铁性畸变，并且在顺铁电相变过程中强烈诱导了成分诱导的无序现象的增强。MPB化合物的独特之处在于，它与最低能量的A-阳离子振动模式的波数不存在任何温度相关性，并且具有等于BO 6八面体形变和小于T C的倾斜的同等动态权重。前者表明在MPB中，与A位点相关的局部尺度的结构极性是纯粹由成分驱动的，而后者则揭示了与铁电态中B位子晶格有关的局部尺度的极性和反铁电体竞争顺序。不会消失，但在顺电状态下在能量上无法区分。
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