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Positron Annihilation in Off‐Stoichiometric and Ta‐Doped Zn 2 TiO 4
Author(s) -
Guagliardo Paul R.,
Vance Eric R.,
Lumpkin Gregory R.,
Blackford Mark G.,
Sudarshan Kathi,
Davis Joel,
Samarin Sergey,
Williams James F.
Publication year - 2013
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/jace.12454
Subject(s) - tetragonal crystal system , doping , positron annihilation , positron annihilation spectroscopy , materials science , stoichiometry , octahedron , phase (matter) , crystallography , spectroscopy , annihilation , ion , analytical chemistry (journal) , positron , chemistry , physics , optoelectronics , crystal structure , electron , chromatography , quantum mechanics , organic chemistry
While Zn vacancies are regarded as the charge compensators in Ti ‐rich Zn 2 TiO 4 , no evidence of cation vacancies in essentially single‐phase samples containing up to 13 wt% excess TiO 2 was evident from positron annihilation lifetime spectroscopy (PALS). Nor was there strong evidence of cation vacancies in Ta ‐doped samples targeted to contain either tetrahedral or octahedral vacancies, although there was a small increase in the lifetime as the doping level increased and the structure changed from cubic to tetragonal.