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Nonstoichiometric defects in YAG and YAP
Author(s) -
Kvapil Jiří,
Kvapil Jos.,
Perner B.,
Mánek B.,
Blažek K.,
Hendrich Z.
Publication year - 1985
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170200410
Subject(s) - annealing (glass) , impurity , atmosphere (unit) , materials science , analytical chemistry (journal) , chemistry , mineralogy , metallurgy , physics , organic chemistry , meteorology
Abstract Spectroscopic properties of undoped YAG and YAP grown under reducing protective atmosphere were compared. Blue (with F centre) or brown (with 0 − centre) varieties both of the materials were prepared in the dependence of the Al 2 O 3 :Y 2 O 3 ratio in the melt. Colour intensity depends on the H 2 O:H 2 ratio in the protective atmosphere and on the sign of electrical potential above the melt level. The coloration may be easily removed by an annealing at > 1200–1400 °C. All the irregularities of the colourations or their remowing by annealing may be attributed to the presence of impurities.