Crystallization behavior and dielectric properties of BaO–ZnO–SrO–CaO–Nd2O3–TiO2–B2O3–SiO2 glass–ceramics

Autor:	Li-Then Mei, Chi-Shiung Hsi, Fu-Su Yen, Wen-Chang Liao, Hsing I. Hsiang
Rok vydání:	2010
Předmět:	Materials science Mechanical Engineering Metals and Alloys Sintering Mineralogy Dielectric Porous glass law.invention Mechanics of Materials law Phase (matter) visual_art Materials Chemistry visual_art.visual_art_medium Ceramic Composite material Crystallization Glass transition Shrinkage
Zdroj:	Journal of Alloys and Compounds. 502:387-391
ISSN:	0925-8388
DOI:	10.1016/j.jallcom.2010.04.176
Popis:	The effects of heating rate on the crystallization and sintering behaviors of glass–ceramics (BaO–ZnO–SrO–CaO–Nd2O3–TiO2–B2O3–SiO2) were investigated in this study. The results showed that the onset of glass shrinkage occurred at around the glass transition temperature. The first crystalline phase, Nd2Ti4O11 was observed at around 775–800 °C. Fully densified glass can be obtained via glass viscous flow before the occurrence of the second crystalline phase, Nd0.66TiO3. With increasing heating rate, the glass transition temperature and crystallization temperature both shift to higher temperature. Sintering at a higher heating rate can retard the Nd0.667TiO3 crystallization of the glass, and thus improves the sintering densification via glass viscous flow during the firing process. The Ba–Zn–Sr–Ca–Nd–Ti–B–Si glass–ceramics sintered at 900 °C with a heating rate of 20 °C/min exhibited a high dielectric constant of 25 and a quality factor of about 1460, which provided a promising candidate for LTCC applications.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::84ea16a3329320bf0928a36dda8a3208 https://doi.org/10.1016/j.jallcom.2010.04.176 Zobrazit plný text záznamu Full Text from ScienceDirect