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ChemInform Abstract: Oxygen Nonstoichiometry and Defects in Mn-Doped Gd2Ti2O7+x.

✍ Scribed by O. PORAT; H. L. TULLER

Publisher
John Wiley and Sons
Year
2010
Weight
27 KB
Volume
28
Category
Article
ISSN
0931-7597

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✦ Synopsis

Oxygen Nonstoichiometry and Defects in Mn-Doped Gd2Ti2O7+x.

-The nonstoichiometry is measured as a function of temp. (700-1000 . degree.C) and O2 partial pressure (10-5 ≀ p(O2) ≀ 1 atm) using a solid-state electrochemical method. The results show that the defect equilibrium is attributable to neutral oxygen interstitials, doubly charged oxygen vacancies, and Mn3+ and Mn4+ substitutions at Ti sites as dominant point defects. The enthalpies for the formation of neutral oxygen interstitials and Mn3+ are determined. -(

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