Premium
Formation of TiO 2 Nanocrystallites in the TiO 2 – ZnO – B 2 O 3 – Al 2 O 3 Glass‐Ceramics
Author(s) -
Masai Hirokazu,
Hirakawa Keisuke,
Yoshida Kazuki,
Miyazaki Takamichi,
Takahashi Yoshihiro,
Ihara Rie,
Fujiwara Takumi
Publication year - 2012
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/j.1551-2916.2012.05397.x
Subject(s) - crystallite , crystallization , crystallinity , materials science , anatase , rutile , mineralogy , chemical engineering , nanocrystalline material , nanocrystal , crystallography , photocatalysis , nanotechnology , chemistry , metallurgy , composite material , biochemistry , engineering , catalysis
We have examined the structure and the crystallization behavior of the 13 TiO 2 – x ZnO –17 Al 2 O 3 –(70− x ) B 2 O 3 ( TZAB ) glass. Coordination number of B 2 O 3 and Al 2 O 3 is changed by substitution of B 2 O 3 – ZnO, whereas coordination states of TiO 2 and ZnO are not affected by the substitution. With increasing amount of ZnO , network forming AlO 4 increases instead of network modifying AlO 5 and AlO 6 . In the case of B 2 O 3 , BO 4 unit is preferentially formed with increasing amount of ZnO . The glass‐ceramics show selective crystallization of TiO 2 , and the precipitated phase of TiO 2 depends on the amount of ZnO . Dendritic‐like aggregates of anatase crystallites were precipitated in the glass‐ceramic containing lower amount of ZnO , whereas isolated granules of rutile crystallites were precipitated in the glass‐ceramic containing higher amount of ZnO . We have demonstrated that the transparency of the glass‐ceramic strongly depends on the crystallinity of precipitated crystallites. The crystallization behavior indicates that both main network and the interstitial components were affected by the substitution.