Abstract

Solid state technique is employed to prepare La doped BNT-BFO perovskite ceramics. The sample has cubic structure and lattice strain = 0.00127 calculated by Williamson–Hall method. The frequency bands corresponding to Bi-O, Ti-O, O-, NaO, LaO and FeO stretching confirm that Fe⁺², La⁺² ions completely incorporate the Ti⁺⁴ ions in the B site of the perovskite. The SEM micrograph shows distinct grains and well defined grain boundaries. The dielectric study reveals grains play dominant role compare to grain boundaries. The Nyquist plots were modeled with designed circuit (CQR)(CR) and confirm that sample has semiconducting nature and supported by Cole–Cole plots.

摘要

采用固态技术制备掺La的BNT-BFO钙钛矿陶瓷。该样品具有立方结构，通过Williamson-Hall方法计算的晶格应变= 0.00127。对应于Bi-O，Ti-O，O-，NaO，LaO和FeO拉伸的频段证实，Fe ⁺²，La ⁺²离子完全将Ti ⁺⁴离子掺入钙钛矿的B位。SEM显微照片显示出明显的晶粒和界限分明的晶粒边界。介电研究表明，与晶界相比，晶粒起着主导作用。奈奎斯特图用设计电路（CQR）（CR）建模，并确认样品具有半导体性质，并受科尔-科尔图支持。