CRYSTALLIZATION EFFECT AFTER PRELIMINARY HEAT-TREATMENT IN MGO-AL2O3-SIO2 QUENCHED GLASS

Authors
ALEKSEENKO VI VOLKOVA GK KONSTANTINOVA TE POPOVA IB
Citation
Vi. Alekseenko et al., CRYSTALLIZATION EFFECT AFTER PRELIMINARY HEAT-TREATMENT IN MGO-AL2O3-SIO2 QUENCHED GLASS, Physica status solidi. a, Applied research, 144(2), 1994, pp. 271-275
Citations number
16
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica status solidi. a, Applied research → ACNP
ISSN journal
00318965
Volume
144
Issue
2
Year of publication
1994
Pages
271 - 275
Database
ISI
SICI code
0031-8965(1994)144:2<271:CEAPHI>2.0.ZU;2-1
Abstract
The effect of preliminary heat treatment (PT) of a quenched glass in t he vitrification temperature range on the course of subsequent non-cat alyzed crystallization is studied using the X-ray and pycnometer densi ty measurements for glassy stoichiometric cordierite powder. An increa se of crystallized mu-cordierite quantity after PT is found. It is est ablished that this effect is caused by the approximate to 20% lowering of the activation energy of mu-phase formation due to the structural relaxation process taking place in quenched glass during PT. A qualita tive model to explain the effect observed as a result of an interactio n between defects in the initial quenched glass is proposed.