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Oxygen Nonstoichiometry and Defects in Mn‐Doped Gd 2 Ti 2 O 7+x
Author(s) -
Porat Ofer,
Tuller Harry L.
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08079.x
Subject(s) - oxygen , partial pressure , doping , crystallographic defect , inorganic chemistry , titration , ion , analytical chemistry (journal) , materials science , chemistry , crystallography , organic chemistry , chromatography , optoelectronics
The oxygen nonstoichiometry in Mn‐doped Gd 2 Ti 2 O 7 , Gd 2 (Ti 0.975 Mn 0.025 ) 2 O 7+x , was measured electrochemically, as a function of temperature and oxygen partial pressure, with the aid of an oxygen titration cell. The analysis of the data shows that the defect equilibrium can be described by considering the dominant point defects to be neutral oxygen interstitials, doubly charged oxygen vacancies, and trivalent and quadrivalent Mn ions substituted in the Ti sites. The enthalpies for the formation of neutral oxygen interstitials and trivalent Mn are determined.