Temperature-related changes in the structure of YSAG:Yb garnet solid solutions with high Sc3+ concentration. Issue 15 (December 2019)

• Record Type: Journal Article
• Authors: Nikova, M.S.; Tarala, V.A.; Vakalov, D.S.; Kuleshov, D.S.; Kravtsov, A.A.; Kuznetsov, S.V.; Chikulina, I.S.; Malyavin, F.F.; Tarala, L.V.; Evtushenko, E.A.; Lapin, V.A.; Pankov, M.A.
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 15(2019)
• Page Start: 4946
• Page End: 4956
• Publication Date: 2019-12
• Subjects: Garnet -- Optical ceramics -- Oxide solid solutions -- Scandium -- Solubility limits; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.07.041
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The paper presents the results of the Sc 3+ solubility limits estimation in dodecahedral and octahedral garnet sites for 1100–1700 °C temperature range. The region of existence of solid solutions with the garnet structure in the Y2 O3 -Al2 O3 -Sc2 O3 and Yb2 O3 -Al2 O3 -Sc2 O3 systems narrows with increasing synthesis temperature. The Sc 3+ solubility in the dodecahedral site of the YbSAG and YSAG garnets decreases with increasing temperature, and at 1700 °C it is about 64 at. %. In the octahedral site of YbSAG garnet, the Sc 3+ solubility decreases from 89.5 to 66.5 at. % with increasing temperature, and in the YSAG system it is about 97.5 at.%. The overall Sc 3+ solubility with the simultaneous introduction into both garnet sites is lower than with doping on one of the sites and also decreases with increasing temperature. The thermal stability of the compositions belonging to single-phase regions was confirmed by vacuum sintering up to 1850 °C.