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Crystallization of Li 2 O · Al 2 O 3 · 6SiO 2 Glasses Containing Niobium Pentoxide as Nucleating Dopant
Author(s) -
Hsu JenYan,
Speyer Robert F.
Publication year - 1991
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.1151-2916.1991.tb06893.x
Subject(s) - crystallization , devitrification , materials science , niobium pentoxide , monoclinic crystal system , niobium , orthorhombic crystal system , pentoxide , tetragonal crystal system , crystallography , dopant , nucleation , mineralogy , analytical chemistry (journal) , crystal structure , chemical engineering , chemistry , metallurgy , vanadium , doping , optoelectronics , organic chemistry , engineering , chromatography
Niobium pentoxide (T form, orthorhombic system) was utilized to promote devitrification in Li 2 O · Al 2 O 3 · 6SiO 2 glasses. Two or more mole percentage of this nucleating dopant enhanced crystallization in these glasses. Glasses containing 4.0 and 8.0 mol% T‐Nb 2 O 5 exhibited a high tendency to form dispersed TT‐Nb 2 O 5 (monoclinic system) precipitates during the glass quenching process. The crystallization process in glasses containing 2.0 or 4.0 mol% T‐Nb 2 O 5 occurred as microphase separation, followed by the formation of dispersed TT‐Nb 2 O 5 crystalline precipitates (760°C), followed by β‐quartz solid‐solution ( ss ) formation (850° to 900°C) heterogeneously nucleated from the precipitates. β‐quartz( ss ) transformed to β‐spodumene( ss ), along with a polymorphic transition from the TT‐Nb 2 O 5 to M‐Nb 2 O 5 (tetragonal system) crystalline phase.