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Devitrification and Phase Separation of Zinc Borosilicate Glasses in the Presence of MgO, P 2 O 5 , and ZrO 2
Author(s) -
Soleimanzade Mehdi,
Eftekhari Yekta Bijan,
Marghussian Vahak
Publication year - 2014
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.12049
Subject(s) - devitrification , borosilicate glass , materials science , crystallization , phase (matter) , zinc , analytical chemistry (journal) , mineralogy , chemical engineering , nuclear chemistry , metallurgy , chromatography , chemistry , organic chemistry , engineering
A base glass composition which undergoes phase separation was chosen in the system Na 2 O‐ZnO‐B 2 O 3 ‐SiO 2 . Spontaneous and reheat‐treatment opal glasses were synthesized by addition of different amounts of oxides such as P 2 O 5 and ZrO 2 . To clarify devitrification, visible spectroscopy was performed for all samples. Reheat‐treated samples showed Tyndall effect in low temperatures, while they were completely opacified after soaking in 800°C for 3 h. P 2 O 5 ‐or ZrO 2 ‐containing samples opacified spontaneously. The mechanism of opacification in glasses containing the MgO and ZrO 2 was partial crystallization, while in the mechanism of P 2 O 5 ‐bearing one was liquid–liquid phase separation.