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Kinetic Study of Amorphous Yttria‐Alumina Fibers Using Differential Thermal Analysis
Author(s) -
Reyes Ena A. Aguilar,
Drew Robin A. L.
Publication year - 2003
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.1151-2916.2003.tb03275.x
Subject(s) - differential thermal analysis , crystallization , materials science , amorphous solid , thermal analysis , yttria stabilized zirconia , activation energy , rod , ceramic , phase (matter) , thermal , analytical chemistry (journal) , mineralogy , chemical engineering , thermodynamics , composite material , crystallography , chemistry , optics , diffraction , cubic zirconia , chromatography , alternative medicine , pathology , engineering , medicine , physics , organic chemistry
Differential thermal analysis (DTA) was used to study the crystallization phenomena in Y 2 O 3 ‐Al 2 O 3 fibers formed via a melt extraction process. Such fibers are X‐ray amorphous and optically transparent regardless of composition in the as‐extracted state but can be crystallized to produce various equilibrium phases that depend on the original composition of the ceramic rods used in the extraction process. The activation energy values were calculated using Kissinger and Augis‐Bennett equations by measuring the variation of the peak temperature in the differential thermal patterns with heating rate. X‐ray diffractometry analysis was used to determine the phase formation in the fibers crystallized after the DTA scan.