Influence of A-site Cation on Structure and Dielectric Properties in A2DyBiO6 (A = Mg, Ca, Sr, Ba) Double Perovskites

Simona Feraru; Adrian I. Borhan; Petrisor Samoila; Gigel G. Nedelcu; Alexandra R. Iordan; Mircea N. Palamaru

doi:10.1071/CH13300

RESEARCH ARTICLE

Influence of A-site Cation on Structure and Dielectric Properties in A₂DyBiO₆ (A = Mg, Ca, Sr, Ba) Double Perovskites

Simona Feraru ^A , Adrian I. Borhan ^A , Petrisor Samoila ^B , Gigel G. Nedelcu ^C , Alexandra R. Iordan ^A and Mircea N. Palamaru ^A ^D

+ Author Affiliations

- Author Affiliations

^A Faculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Iasi, 700506, Romania.

^B Petru Poni Institute of Macromolecular Chemistry, Iasi, 700487, Romania.

^C Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, 700506, Romania.

^D Corresponding author. Email: palamaru@uaic.ro

Australian Journal of Chemistry 67(2) 250-255 https://doi.org/10.1071/CH13300
Submitted: 14 June 2013 Accepted: 18 September 2013 Published: 17 October 2013

Abstract

Double perovskite metal oxides with formula A₂DyBiO₆ (A = Mg, Ca, Sr, Ba) were synthesised by a sol–gel auto-combustion method, using citric acid as the combustion agent. The effects of A-site cation on the structure, morphology, and dielectric properties were examined. The synthesis was monitored using Fourier transform infrared spectroscopy (FTIR) to indicate the absence of organic phase. X-ray diffraction (XRD) analysis showed that the compounds have three different perovskite structures. Structural characterisation of the samples was evaluated using XRD patterns. Scanning electron microscopy showed that all samples are formed by agglomerated particles. Dielectric properties were evaluated using dielectric permittivity and dielectric losses. Cole–Cole plots show a single semicircle for all materials, indicating that the double perovskites obtained are composed of well conducting grain boundaries and poorly conducting grains.

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