Wendari Tio Putra, Arief Syukri, Mufti Nandang, Blake Graeme R, Baas Jacob, Suendo Veinardi, Prasetyo Anton, Insani Andon, Zulhadjri Zulhadjri
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Andalas, Kampus Limau Manis, Padang 25163, Indonesia.
Center of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia.
Inorg Chem. 2022 Jun 13;61(23):8644-8652. doi: 10.1021/acs.inorgchem.1c03624. Epub 2022 May 27.
Aurivillius phase BiLaNbMnO, derived from ferroelectric PbBiNbO by simultaneous substitution of the -site and -site cations, was synthesized using a molten-salt method. Here, we discuss the structure-property relationships in detail. X-ray and neutron diffraction show that BiLaNbMnO adopts an 2 orthorhombic crystal structure. Rietveld refinement analysis, supported by Raman spectroscopy, indicates that the Bi ions occupy the bismuth oxide blocks, La ions occupy the perovskite -site, and Nb/Mn ions occupy the perovskite -site. Ferroelectric ordering takes place at 535 K, which coexists with local ferromagnetic order below 65 K. The cation disorder on the -site results in relaxor-ferroelectric behavior, and the short-range ferromagnetic order can be attributed to Mn/Mn double-exchange. Magnetodielectric coupling measured at 5 K and 100 kHz in a field of 5 T suggests the existence of intrinsic spin-lattice coupling with a magnetodielectric coefficient of 0.20%. These findings will provide significant impetus for further research into potential devices based on the magnetodielectric effect in Aurivillius materials.
通过同时取代A位和B位阳离子，从铁电体PbBiNbO衍生而来的奥里维利乌斯相BiLaNbMnO，采用熔盐法合成。在此，我们详细讨论其结构-性能关系。X射线和中子衍射表明BiLaNbMnO采用正交晶系晶体结构。在拉曼光谱的支持下，里特韦尔德精修分析表明，Bi离子占据氧化铋块，La离子占据钙钛矿A位，Nb/Mn离子占据钙钛矿B位。铁电有序在535 K发生，在65 K以下与局域铁磁有序共存。A位上的阳离子无序导致弛豫铁电行为，短程铁磁有序可归因于Mn/Mn双交换。在5 K和100 kHz、5 T磁场下测量的磁电耦合表明存在本征自旋-晶格耦合，磁电系数为0.20%。这些发现将为基于奥里维利乌斯材料磁电效应的潜在器件的进一步研究提供重要动力。
