Structural and dielectric properties of Bi-doped barium strontium titanate nanopowders synthesized by sol–gel method

Nano-crystalline barium strontium titanate, Ba0.5Sr0.5TiO3, (BST) powders were synthesized by sol–gel method, and the effects of Bi-doped on the microstructure and dielectric properties of BST powders were investigated. At first, the stable BST sols with optimum molar ratio were prepared and then di...

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Bibliographic Details
Published in:	Journal of materials research and technology Vol. 6; no. 2; pp. 108 - 115
Main Authors:	Sadeghzadeh Attar, Abbas, Salehi Sichani, Ehsan, Sharafi, Shahriar
Format:	Journal Article
Language:	English
Published:	Elsevier Editora Ltda 01-04-2017 Elsevier
Subjects:	Barium strontium titanate Bi-doped Dielectric properties Sol–gel process Sol–gel process Bi-doped Dielectric properties Barium strontium titanate
Online Access:	Get full text
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Summary:	Nano-crystalline barium strontium titanate, Ba0.5Sr0.5TiO3, (BST) powders were synthesized by sol–gel method, and the effects of Bi-doped on the microstructure and dielectric properties of BST powders were investigated. At first, the stable BST sols with optimum molar ratio were prepared and then different precents of bismuth were doped in precursor solutions. The samples, after drying and calcination at 850°C for 2h, were characterized by TG-DTA, FTIR, XRD, FESEM and LCR meter equipments. The results showed that the crystallite size and lattice parameter changed by increasing doped Bi content of BST. Also, with increasing Bi content from 2 to 4mol%, average particle size of BSTB decreased from 40 to 35nm. The dielectric constant for all samples increased with increasing calcination temperatures and then decreased after Curie temperature. An increase in the dielectric constant was observed up to a maximum of 1040 at a temperature of 80°C for BSTB2 and 910 at 70°C for BSTB4, approximately. The maximum value of dielectric constant and dielectric loss of the Bi-doped BST ceramics decreased with increasing Bi content.
ISSN:	2238-7854
DOI:	10.1016/j.jmrt.2016.05.001