Oxygen-loss in A-site deficient Sr0.85La0.10TiO 3 perovskite

Ipek Akin, Ming Li, Zhilun Lu, Derek C. Sinclair*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The electrical properties of Sr1-3xLa2xTiO 3 ceramics (x = 0.05, LST) change dramatically with sintering temperature and atmosphere. Ceramics sintered at 1200 °C in both O 2 and N2 exhibit near intrinsic band-type conduction with bulk conductivity ∼10-7 S cm-1 at 500 °C and activation energy for conduction, Ea of ∼1.6-1.8 eV. LST ceramics sintered at 1450 °C in O2 exhibit much higher bulk conductivity (>10-4 S cm-1 at -50 °C) with an Ea ∼ 0.16 eV. For LST ceramics sintered at 1450 °C in N2, the bulk conductivity was too high to be measured by impedance spectroscopy even at 10 K. In addition, electrical heterogeneity is observed in LST pellets sintered at 1450 °C under both O2 and N2 where pellet outer surfaces are more resistive than the inner regions of the ceramic. The defect chemistry of Sr0.85La0.10TiO3 perovskite is discussed based on chemical doping and oxygen-loss mechanisms and we highlight the importance of A-site vacancies on the oxygen-loss mechanism in La-doped ST-based ceramics.

Original languageEnglish
Pages (from-to)32549-32554
Number of pages6
JournalRSC Advances
Volume4
Issue number61
DOIs
Publication statusPublished - 2014

Funding

FundersFunder number
Engineering and Physical Sciences Research CouncilEP/G005001/1

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