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Positron Annihilation Lifetime Study of Vacancies in Nb‐Doped Rutile
Author(s) -
Vance Eric R.,
Hadley Joseph H.,
Hsu Frank H.
Publication year - 2008
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.1551-2916.2008.02679.x
Subject(s) - rutile , doping , positron annihilation , materials science , annihilation , positron , sintering , analytical chemistry (journal) , atomic physics , condensed matter physics , nuclear physics , metallurgy , chemistry , electron , physics , optoelectronics , organic chemistry , chromatography
Nb‐doped rutile produced by sintering at 1400°C in an air atmosphere led to a monotonic increase of the shortest τ 1 lifetime of the major spectral component from 0.17 to 0.25 ns in the 22 Na positron annihilation lifetime spectrum as the Nb doping level was progressively increased to 0.12 formula units, at which stage TiNb 2 O 7 was observed as a second phase. The charge compensators for Nb 5+ substituting for Ti 4+ are indicated as cation vacancies on the basis of the increase of τ 1 .