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Ceramics based on Sr0.8La0.067Ti0.8Nb0.2O3−δ have been prepared by the mixed oxide route. The La1/3NbO3 component generates ∼13.4% A-site vacancies; this was fixed for all samples. Powders were sintered under air and reducing conditions at 1450 to 1700 K; products were of high density (>90% theoretical). Processing under reducing conditions led to the formation of a Ti1−xNbxO2−y second phase, core–shell structures and oxygen deficiency. X-ray diffraction (XRD) confirmed a simple cubic structure with space group Pmm. Transmission electron microscopy revealed a high density of dislocations while analytical scanning transmission electron microscopy at atomic resolution demonstrated a uniform distribution of La, Nb and vacancies in the lattice. X-ray photoemission spectroscopy and thermogravimetry showed the oxygen deficiency (δ value) to be ∼0.08 in reduced samples with enhanced carrier …
Royal Society of Chemistry
Publication date: 
1 Jan 2016

Deepanshu Srivastava, Colin Norman, Feridoon Azough, Marion C Schäfer, Emmanuel Guilmeau, Demie Kepaptsoglou, Quentin M Ramasse, Giuseppe Nicotra, Robert Freer

Biblio References: 
Volume: 18 Issue: 38 Pages: 26475-26486
Physical Chemistry Chemical Physics