Synthesis, structure and total conductivity of A-site doped LaTiO sub(3- delta ) perovskites

Oxygen defecient perovskites LaTiO sub(3- delta ) and La sub(0.8)A sub(0.2)TiO sub(3- delta ) (A = Ba, Sr, Ca) were synthesized by sol-gel method. The effect of divalent dopants on microstructure is investigated in detail using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The oxid...

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Published inJournal of alloys and compounds Vol. 626; pp. 245 - 251
Main Authors Bradha, M, Hussain, S, Chakravarty, Sujay, Amarendra, G, Ashok, Anuradha
Format Journal Article
LanguageEnglish
Published 25.03.2015
Subjects
Alloys
Diffraction
Doping
Perovskites
Scanning electron microscopy
Sol gel process
Strontium
X-ray photoelectron spectroscopy
X-rays
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Summary:Oxygen defecient perovskites LaTiO sub(3- delta ) and La sub(0.8)A sub(0.2)TiO sub(3- delta ) (A = Ba, Sr, Ca) were synthesized by sol-gel method. The effect of divalent dopants on microstructure is investigated in detail using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The oxidation states of La super(3+) and Ti super(3+) ions have been deduced using X-ray Photoelectron Spectroscopy (XPS). Impedance spectroscopy was used to analyze the total conductivity, an increase in conductivity was observed after doping in the A-site with divalent cations Ba, Ca and Sr. Among the investigated perovskites La sub(0.8)Ca sub(0.2)TiO sub(3- delta ) exhibited the maximum conductivity of 1.22 x 10 super(-2) S/cm in air atmosphere at 650 [degrees]C.
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ISSN:0925-8388
DOI:10.1016/j.jallcom.2014.12.033