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Colour centres in barium hexaaluminate (Phase I). Study by electron paramagnetic resonance, optical absorption, and thermally stimulated luminescence
Author(s) -
Gourier D.,
Gbehi T.,
Visocekas R.,
Thery J.,
Vivien D.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221520204
Subject(s) - luminescence , electron paramagnetic resonance , barium , absorption (acoustics) , materials science , thermal stability , paramagnetism , photochemistry , phase (matter) , irradiation , resonance (particle physics) , optoelectronics , nuclear magnetic resonance , chemistry , atomic physics , condensed matter physics , physics , organic chemistry , nuclear physics , metallurgy , composite material
Abstract Colour centres produced by X‐ray irradiation of barium hexaaluminate (phase I) with β‐alumina structure are studied by electron paramagnetic resonance, optical absorption, and thermally stimulated luminescence. It is shown that in addition to the F + centres characteristic of β‐alumina phases, this compound presents other colour centres such as F, O − , and possibly V‐type centres. The stability of these defects is investigated by means of thermal bleaching experiments and thermally stimulated luminescence. An alternative model to the generally accepted one is proposed, for the F + centres, together with a mechanism of defect formation.