材料科学与工程学报2017，Vol.35Issue(5)：704-707,4.DOI:10.14136/j.cnki.issn 1673-2812.2017.05.004
MLnBO4陶瓷中K2NiF4型层状钙钛矿结构的稳定性
Stability of K2NiF4-Type Layered Perovskite Structure in MLnBO4 Ceramics
摘要
Abstract
MLnBO4(M=Ba,Sr,Ca;Ln=La,Nd,Sm,Y;B=(Zn0.5Ti0.5),(Mg0.5Ti0.5)) ceramic powders were prepared by solid state reaction method,and the phase constitution of the products was analyzed by XRD (X-ray diffraction).Combining with the results for B=Ga and Al from the literatures,the stability of K2NiF4-type layered perovskite structure in MLnBO4 ceramics was discussed.For certain M2+ and B3+ ions,K2NiF4-type structure became unstable with the deviation of tolerance factor of perovskite layer (t) from 1.For some differentM2+ and B3+ ions,however,no direct relationship could be observed between them.On the other hand,when considering the ion radii differences of M2+ 、Ln3+ and B3+,it was observed that K2NiF4-type structure only existed in an area that was centered at r(M2+)/r(Ln3+) =1.1 and r(Ln3+)/r(B3+) =2.Therefore,it is much more reliable to estimate the stability of K2NiF4-type layered perovskite structure in MLnBO4 ceramics by comparing the ion radii of M2+,Ln3+ and B3+ rather than by the tolerance factor of perovskite layer.These findings are important for the design and development of relevant materials.关键词
MLnBO4/K2 NiF4/层状钙钛矿/结构稳定性Key words
MLnBO4/K2NiF4/layered perovskite/structure stability分类
通用工业技术引用本文复制引用
朱俊瑶,李雷,任光荣..MLnBO4陶瓷中K2NiF4型层状钙钛矿结构的稳定性[J].材料科学与工程学报,2017,35(5):704-707,4.基金项目
国家重大基础研究计划资助项目(2015CB654601),浙江省公益技术应用研究计划资助项目(2016C31006) （2015CB654601）
