Structural and dielectric properties of barium strontium titanate (Ba(1-X)SrxTiO3) ceramics

Abstract

Abstract

Structural and dielectric properties of barium strontium titanate (Ba_(1-x)Sr_xTiO₃) ceramics with x= 0.25, 0.5 and 0.75 were investigated. The Ba_(1-x)Sr_xTiO₃ ceramics were synthesised by solid state reaction method. Microstructure, surface morphology and dielectric properties of the synthesised ceramics were examined using XRD, SEM and Impedance Spectroscopy respectively. XRD results revealed that all samples contained BaTiO₃ as primary phase with tetragonal perovskite crystal structure. The crystallite size slightly increased with the increasing of Sr contents. SEM micrographs showed that the microstructure become denser when Sr contents increased. Impedance spectroscopy showed dielectric constant for all samples were decreased with increasing temperature up to 200^oC.

 Abstrak

sifat-sifat struktur dan dielektrik barium strontium titanate (Ba (1-x) Sr_xTiO₃) seramik dengan x = 0.25, 0.5 dan 0.75 telah disiasat. The Ba (1-x) seramik Sr_xTiO₃ telah disintesis melalui kaedah tindak balas keadaan pepejal. Mikrostruktur, permukaan morfologi dan dielektrik sifat-sifat seramik disintesis telah diperiksa menggunakan masing-masing XRD, SEM dan Impedance Spektroskopi. keputusan XRD mendedahkan bahawa semua sampel yang terkandung BaTiO₃ sebagai fasa utama dengan tetragonal struktur perovskit kristal. Saiz crystallite sedikit meningkat dengan peningkatan kandungan Sr. SEM mikrograf menunjukkan mikrostruktur menjadi lebih padat apabila isi kandungan Sr meningkat. Galangan spektroskopi menunjukkan pemalar dielektrik untuk semua sampel telah menurun dengan peningkatan suhu sehingga 200^oC.