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Crystallization Kinetics and Dielectric Properties of Fresnoite BaO–TiO 2 –SiO 2 Glass–Ceramics
Author(s) -
Rangarajan Badri,
Shrout Tom,
Lanagan Michael
Publication year - 2009
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.1551-2916.2009.03255.x
Subject(s) - crystallization , nucleation , materials science , activation energy , dielectric , kinetics , mineralogy , ceramic , glass ceramic , analytical chemistry (journal) , chemical engineering , thermodynamics , composite material , chemistry , physics , optoelectronics , quantum mechanics , engineering , chromatography
Nucleation and crystallization kinetics of fresnoite (Ba 2 TiSi 2 O 8 ) crystals in BaO–TiO 2 –SiO 2 glasses have been explored for dielectric applications. The volume fractions crystallized at different temperatures and times were tracked by XRD analysis. The activation energy of crystallization was estimated from DTA results to be about 528 kJ/mol, which is consistent with the value obtained by XRD results. The Avrami parameter values calculated at different temperatures from DTA results were found to be between 3.2 and 3.9, indicating that the growth is three dimensional and the mechanism of growth is interface‐controlled. Additionally, because of compositional similarities, the dielectric contrast between the glass (ɛ r ∼15) and the resulting glass–ceramic (ɛ r ∼18) was minimal.