Crystallization Kinetics and Dielectric Properties of Fresnoite BaO-TiO2-SiO2Glass-Ceramics

Autor:	T.R. Shrout, Badri Rangarajan, Michael T. Lanagan
Rok vydání:	2009
Předmět:	Materials science Analytical chemistry Nucleation Mineralogy Activation energy Dielectric law.invention Crystallization kinetics Dielectric contrast Volume (thermodynamics) law visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Crystallization
Zdroj:	Journal of the American Ceramic Society. 92:2642-2647
ISSN:	1551-2916 0002-7820
Popis:	Nucleation and crystallization kinetics of fresnoite (Ba2TiSi2O8) crystals in BaO–TiO2–SiO2 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 (ɛr∼15) and the resulting glass–ceramic (ɛr∼18) was minimal.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3f6673a1c5a08b1f496d038756da020b https://doi.org/10.1111/j.1551-2916.2009.03255.x Zobrazit plný text záznamu Plný text ve formátu PDF