Department of Physics, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi 221005, India.
Phys Chem Chem Phys. 2018 Jul 11;20(27):18800-18810. doi: 10.1039/c8cp01971a.
A piezoelectric material KNbO3 has been co-substituted with the magnetic ions Sm3+ and Fe3+ in order to explore the relation between piezoelectricity and magnetism. The samples K1-xSmxNb1-xFexO3 [x = 0.0-0.1] were synthesized using a solid state reaction route, after estimating the structural stability with the substitution. Structural studies were employed using XRD with Rietveld refinement and Raman analysis suggesting Amm2 symmetry. Also, the transition temperature was observed to change with the increase in Sm and Fe content. This transition temperature was also confirmed through high temperature XRD and high temperature Raman results. The dielectric and piezoelectric properties were found to be in correlation with the intensity of Raman modes for substituted samples, indicating better ferroelectricity at x = 0.05. A correlation between piezoelectric and magnetic properties was established in terms of the coercive field and exchange energy.
为了探究压电性与磁性之间的关系，一种名为 KNbO3 的压电材料被 Sm3+ 和 Fe3+ 两种磁性离子共取代。使用固相反应法合成了 K1-xSmxNb1-xFexO3 [x = 0.0-0.1] 样品，通过取代来估算结构稳定性。利用 XRD 与 Rietveld 精修和拉曼分析研究了结构，结果表明具有 Amm2 对称性。同时，观察到相变温度随 Sm 和 Fe 含量的增加而变化。该相变温度也通过高温 XRD 和高温拉曼结果得到了证实。介电和压电性能与取代样品的拉曼模式强度相关，表明在 x = 0.05 时具有更好的铁电性。根据矫顽场和交换能建立了压电和磁性能之间的相关性。
