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

Simona Feraru,A I Borhan,P Samoila,G G Nedelcu,Alexandra Raluca Iordan,M N Palamaru

AUSTRALIAN JOURNAL OF CHEMISTRY（2014）

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摘要

Double perovskite metal oxides with formula A(2)DyBiO(6) (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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kinetics,enzymes,biosensors,crystallography,inorganic chemistry,polymer chemistry,biological chemistry,catalysis,peptide,sensors,macromolecules,quantum chemistry,spectroscopy,nanotechnology,reaction mechanisms,physical chemistry,supramolecular chemistry,green chemistry,analytical chemistry,mass spectrometry,surface chemistry,educational,ionic liquids,computational chemistry,density functional theory,combinatorial,photochemistry,organic chemistry,pharmaceutical chemistry,biocatalysis,colloids,self assembly,structure,combinatorial chemistry,interfaces,electrochemistry,proteins,crystal structures,medicinal chemistry,ab initio calculations,amino acids

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