Premium
Binary Titania‐Silica Glasses Containing 10 to 20 Wt% TiO 2
Author(s) -
SCHULTZ PETER C.
Publication year - 1976
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.1151-2916.1976.tb10936.x
Subject(s) - anatase , materials science , thermal expansion , crystallization , metastability , rutile , devitrification , mineralogy , annealing (glass) , analytical chemistry (journal) , refractive index , opacity , phase (matter) , glass transition , atmospheric temperature range , chemical engineering , thermodynamics , chemistry , composite material , optics , polymer , chromatography , organic chemistry , physics , optoelectronics , photocatalysis , engineering , catalysis
A series of glasses in the TiO 2 ‐SiO 2 system was prepared by the flame hydrolysis boule process. Clear glasses containing as much as 16.5 wt% TiO 2 were obtained. More TiO 2 caused opacity due to phase separation and anatase/rutile crystallization during glass boule formation. Glasses in the 12 to ∼17 wt% TiO 2 range were metastable and showed structural rearrangements on heat treatment at temperatures as low as 750CEC (∼200° below the annealing point). These changes were accompanied by large changes in thermal expansion. Thermal treatment can be designed to produce almost any desired expansion between α ‐200+700 =−5 × 10 ‐7 /°C and +10 × 10 ‐7 /°C. Zero expansion between 0 and 550°C was obtained. Evidence that these changes are due to phase separation and anatase formation is presented. Viscosity data in the glass transition range, refractive index, and density are also presented.