Berenov A, Le Goupil F, Alford N
Department of Materials, Imperial College London, London, SW7 2AZ, UK.
Sci Rep. 2016 Jun 21;6:28055. doi: 10.1038/srep28055.
A series of Ba1-x-ySrxCayTiO3 compounds were prepared with varying average ionic radii and cation disorder on A-site. All samples showed typical ferroelectric behavior. A simple empirical equation correlated Curie temperature, TC, with the values of ionic radii of A-site cations. This correlation was related to the distortion of TiO6 octahedra observed during neutron diffraction studies. The equation was used for the selection of compounds with predetermined values of TC. The effects of A-site ionic radii on the temperatures of phase transitions in Ba1-x-ySrxCayTiO3 were discussed.
制备了一系列具有不同平均离子半径和A位阳离子无序度的Ba1-x-ySrxCayTiO3化合物。所有样品均表现出典型的铁电行为。一个简单的经验方程将居里温度TC与A位阳离子的离子半径值相关联。这种相关性与中子衍射研究中观察到的TiO6八面体的畸变有关。该方程用于选择具有预定TC值的化合物。讨论了A位离子半径对Ba1-x-ySrxCayTiO3相变温度的影响。
