Anion deficiency in strontium titanate

ABSTRACT STUDIES of the anion deficient phases of titanium and vanadium perovskites showed that the perovskite SrTiO3−x has a wide range of composition extending from _x_ = 0 to _x_ = 0.5

(ref. 1). The nonstoichiometry was inferred from the monophasic behaviour of the solid within this compositional range as obtained by means of powder X-ray diffraction. The same cubic

structure was found for both Sr Ti O2.5 and Sr Ti O3. Perovskites have been widely studied recently in view of the very interesting and useful properties of these oxides2. The physiochemical

properties of Sr Ti O3 include semiconductivity3,4 and superconductivity5 as well as peculiar phase transitions6. Of particular interest in this, and other7, systems is the presence of

point defects and their influence on those properties. It seems that, at small degrees of reduction, doubly ionised oxygen vacancies are the main defects present on Sr Ti O3−x (ref. 8).

Although in that case, the oxygen vacancies, being at small numbers, are probably distributed at random, the presence of so many empty oxygen positions as the stoichiometry of SrTiO2.5

implies—one in every six oxygens missing—automatically suggests the possibility of ordering. This possibility seems to be realised under the synthesis conditions that we have used and we

report here some of the results so far obtained in the system SrO–Ti2O3–TiO2. Access through your institution Buy or subscribe This is a preview of subscription content, access via your

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* Learn about institutional subscriptions * Read our FAQs * Contact customer support SIMILAR CONTENT BEING VIEWED BY OTHERS THE ELECTRONIC PROPERTIES OF SRTIO3-Δ WITH OXYGEN VACANCIES OR

SUBSTITUTIONS Article Open access 02 December 2021 A COMPREHENSIVE EXAMINATION OF THE LOCAL- AND LONG-RANGE STRUCTURE OF SB6O13 PYROCHLORE OXIDE Article Open access 12 October 2020 EFFECT OF

V2O5 B-SITE SUBSTITUTION ON THE MICROSTRUCTURE, RAMAN SPECTRUM, AND DIELECTRIC PROPERTIES OF SRBI2TA2O9 CERAMICS Article Open access 05 November 2020 REFERENCES * Kestigian, M., Dickinson,

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INFORMATION AUTHORS AND AFFILIATIONS * Departamento de Química Inorgánica. Facultad de Ciencias Quimicas, Universidad Complutense, Ciudad Universitaria, Madrid, 3, Spain M. A. ALARIO FRANCO

 & M. VALLET REGÍ Authors * M. A. ALARIO FRANCO View author publications You can also search for this author inPubMed Google Scholar * M. VALLET REGÍ View author publications You can

also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE FRANCO, M., REGÍ, M. Anion deficiency in strontium

titanate. _Nature_ 270, 706–708 (1977). https://doi.org/10.1038/270706a0 Download citation * Received: 26 September 1977 * Accepted: 26 September 1977 * Published: 01 December 1977 * Issue

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