Determination of A.C. Conductivity of Nano-Composite Perovskite Ba<sub>(1- x - y)</sub>Sr<sub>(x)</sub>TiFe<sub>(y)</sub>O<sub>3</sub>Prepared by the Sol-Gel Technique

• 作者: A. B. Abou Hamad F. G. El Desouky I. K. Battisha M. A. Salem M. Q. Israr M. Willander O. Nur
• 来源期刊: 结晶过程及技术期刊(英文)
• 学科: 化学
• 关键词: Sol-Gel Dielectric Permittivity A.C. CONDUCTIVITY NANO-COMPOSITE BaSrTiO3 (BST) TEM XRD and SEM
• 年，卷（期）: jjgcjjsqkyw_2012,（1）
• 页码范围: 1-11
• 页数: 11页
• 分类号: O6

摘要

Nano-composite, perovskite Ba(1- x - y)Sr(x)TiFe(y)O3, denoted as (BSTFe) in powder form was derived via sol-gel (SG) method followed by sintering at fixed temperature 750℃ for one hour. The chemical composition, morphology and structure of the powder samples were investigated by using X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM). The XRD characterization indicates formation of a cubic crystalline phase in the pure BST. A well defined perovskite phase with nano-crystallite sizes equal to about 34 nm was achieved from XRD for B10ST3F sample, while TEM study confirmed the obtained XRD results giving the following crystallite size value about 33.75 nm for the same sample. The dielectric A.C. conductivity was evaluated as a function of temperature and frequency ranging from 42 Hz up to 1 MHz.