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Studies of ferroelectric and magnetic phase transitions in Pb(Fe0.5Nb0.5)1-xCexO3 multiferroic ceramics
Ferroelectrics ( IF 0.8 ) Pub Date : 2020-10-07 , DOI: 10.1080/00150193.2020.1791609
S. I. Raevskaya, V. V. Titov, I. P. Raevski, S. P. Kubrin, C.-C. Chou, S. I. Shevtsova, M. A. Malitskaya, I. N. Zakharchenko

Abstract Multiferroic Pb(Fe0.5Nb0.5)1-xCexO3 (x = 0.025, 0.05, 0.075, 0.10) ceramic compositions were prepared by solid state synthesis and usual sintering. XRD studies have shown a formation of the perovskite structure in all the compositions studied. However a small amount of pyrochlore phase was detected in Ce-doped compositions with x ≥ 0.075. Scanning electron microscopy studies and elemental analysis have shown that at the boundaries of the large grains of nearly pure PbFe0.5Nb0.5O3 there exist a lot of small submicron grains enriched by Ce. Concentration dependencies of the unit-cell parameter and temperatures of ferroelectric and magnetic phase transitions also imply that solubility of Ce in PFN does not exceed ≈ 2 at.%.

中文翻译:

Pb(Fe0.5Nb0.5)1-xCexO3多铁性陶瓷中铁电和磁相变的研究

摘要 通过固态合成和常规烧结制备了多铁性 Pb(Fe0.5Nb0.5)1-xCexO3 (x = 0.025, 0.05, 0.075, 0.10) 陶瓷组合物。XRD 研究表明在所有研究的组合物中都形成了钙钛矿结构。然而,在 x ≥ 0.075 的 Ce 掺杂组合物中检测到少量烧绿石相。扫描电镜研究和元素分析表明,在接近纯 PbFe0.5Nb0.5O3 的大晶粒边界处,存在大量富含 Ce 的小亚微米晶粒。晶胞参数的浓度依赖性以及铁电和磁性相变的温度也意味着 Ce 在 PFN 中的溶解度不超过 ≈ 2 at.%。
更新日期:2020-10-07
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