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Primary Crystallization Behavior of ZrO 2 –Y 2 O 3 Powders: In Situ Hot‐Stage XRD Technique
Author(s) -
Ghosh Abhijit,
Upadhyaya Dharni D.,
Prasad Ram
Publication year - 2002
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.1151-2916.2002.tb00471.x
Subject(s) - crystallization , activation energy , materials science , arrhenius equation , cubic zirconia , amorphous solid , yttria stabilized zirconia , isothermal process , chemical engineering , phase (matter) , mineralogy , analytical chemistry (journal) , thermodynamics , crystallography , composite material , chemistry , chromatography , organic chemistry , ceramic , physics , engineering
A major component of the driving force for crystallization of hydrous zirconia–yttria powders comes from their noncrystallinity. Subsequent to dehydration of coprecipitated gels, the amorphous‐to‐crystalline phase transformation is the regime of primary crystallization. For the present study of 3.0‐, 5.0‐, and 9.0‐mol%‐yttria‐stabilized zirconia, the powders were produced as fine aggregates of ∼300 nm median diameter. The activation energy in all three cases was determined by the hot‐stage X‐ray diffraction technique where the powders were heated isothermally in the temperature range of 500°–600°C. The Avrami equation was used to calculate the rate constant value and the Arrhenius relationship was utilized to determine the value of the activation energy for primary crystallization.