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Thermal and crystallization behavior of SiO 2 ‐PbF 2 glass system in the presence of ErF 3 and Al 2 O 3
Author(s) -
Torab Ahmadi Pooya,
Eftekhari Yekta Bijan,
Mohammadi Hesameddin,
GolestaniFard Farhad
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.16186
Subject(s) - crystallization , nucleation , materials science , crystallite , thermal stability , microstructure , mineralogy , dissolution , chemical engineering , doping , phase (matter) , fluoride , analytical chemistry (journal) , metallurgy , thermodynamics , chemistry , inorganic chemistry , physics , optoelectronics , organic chemistry , chromatography , engineering
Oxyfluoride glass‐ceramics have been introduced as one of the best bulk hosts for upconversion process of rare‐earth ions. However, less attention to the technological topics in the process of glass crystallization has hindered the development of them in industrial scale applications. In this research, SiO 2 –PbF 2 glasses were investigated to clarify the ambiguous role of rare‐earth ions and alumina content in the microstructure and crystallization behavior. Results indicated that Er 3+ addition caused a liquid‐liquid phase separation via nucleation and growth mechanism, which led to single phase crystallization of β‐PbF 2 :Er 3+ solid solution. Moreover, Er 3+ had a significant effect on the crystallite size, size distribution, and PbF 2 crystallization temperature. On the other hand, increasing Al 2 O 3 content enhanced the transparency and thermal stability of glass samples, whereas it reduced the amount of fluorine loss and increased the dissolution of Er 3+ in fluoride crystalline structure. These results address some of the most controversial issues about crystallization behavior of rare‐earth‐doped oxyfluoride glasses.