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Influence of Cr doping on the phase composition of Cr,Ca: YAG ceramics by solid state reaction sintering
Author(s) -
Chaika Mykhailo,
Paszkowicz Wojciech,
Strek Wiesław,
Hreniak Dariusz,
Tomala Robert,
Safronova Nadiya,
Doroshenko Andriy,
Parkhomenko Sergiy,
Dluzewski Piotr,
Kozłowski Mirosław,
Vovk Oleh
Publication year - 2019
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.16024
Subject(s) - sintering , materials science , ceramic , transparent ceramics , doping , phase (matter) , analytical chemistry (journal) , perovskite (structure) , solid state , mineralogy , absorption (acoustics) , chemical engineering , metallurgy , crystallography , chemistry , composite material , organic chemistry , optoelectronics , engineering
In the present work, the influence of Cr and Ca co‐additives on the phase formation under conditions emulated the real sintering process of Cr 4+ : YAG ceramics is studied. The XRD analysis of the treated samples revealed the difference in formation rates of intermediate phases between the samples with and without the Cr 2 O 3 additive. The formation of intermediate phases in the solid‐state reaction between Y 2 O 3 and Al 2 O 3 is observed to shift toward higher temperatures (ie, toward the stage of fast shrinkage) if the mixture of Cr 2 O 3 and CaO is added. The reason for such shift is the appearance of new intermediate, which contains Cr 4+ ions in perovskite structure, as has been established by optical absorption and luminescent investigations. It is found that the Cr,Ca: YAG ceramics prepared by vacuum solid state reaction sintering at 1750°C, 10 hours possesses better optical transparency than Ca: YAG ceramics prepared under the same conditions.