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Positron Annihilation Lifetime Spectroscopy of Air‐Fired Ca (1− x ) (La) x TiO 3 Perovskites
Author(s) -
Hadley J. H.,
Hsu F. H.,
Vance E. R.,
Begg B. D.
Publication year - 2005
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.1551-2916.2004.00045.x
Subject(s) - stoichiometry , perovskite (structure) , crystallite , analytical chemistry (journal) , materials science , positron annihilation , annihilation , charge carrier , spectroscopy , positron , chemistry , crystallography , physics , metallurgy , nuclear physics , electron , optoelectronics , chromatography , quantum mechanics
In polycrystalline air‐fired perovskites of Ca (1− x ) (La) x TiO 3 stoichiometry ( x =0.00–0.15), the positron annihilation lifetime increased monotonically with x , and showed an ∼40% increase of the lifetime at x ∼0.1, at which value the lifetime increase saturated. These data, together with measured perovskite stoichiometry, indicate that equal numbers of Ca and Ti vacancies were the prime charge compensators. Thermal gravimetric data are consistent with charge compensation occurring via the cation vacancies in the air‐fired samples and Ti 3+ in equivalent samples prepared under reducing conditions.