Low temperature sintering of BaO-Sm2O3-4TiO2 ceramics

• Published in: Journal of the European Ceramic Society Vol. 27; no. 2-3; pp. 1053 - 1058
• Main Authors: CHO, Kyung-Hoon, LIM, Jong-Bong, NAHM, Sahn, KIM, Hyo-Tae, KIM, Jong-Hee, PAIK, Jong-Hoo, LEE, Hwack-Joo
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Oxford Elsevier 2007
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Electrotechnical and electronic ceramics; Exact sciences and technology; Technical ceramics; Samarium oxides; Scanning electron microscopy; Ternary system; Electrical properties; Dielectric properties; Experimental study; X ray diffraction; Oxide ceramics; Barium oxide; Sintering; Barium Samarium Titanium Oxides Mixed; Manufacturing; Microstructure; Titanium oxide; Low temperature; Electroceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2006.05.061

BaSm2Ti4O12 was prepared by solid state synthesis and calcined at 1100 C. The sintered material was then re-milled with additions of B2O3 and CuO as sintering aids, pressed into discs and sintered at 875-1000 C. The specimens were characterised by microstructural studies, and by measurements of density, dielectric properties at microwave frequencies, and the temperature coefficient of resonant frequency over the temperature range 25-80 C. The addition of B2O3 reduced the sintering temperature from approximately 1350 C to 1000 C, and a further reduction to 875 C was achieved by the addition of CuO. The material with an addition of 10.0 mol% B2O3 and 20.0 mol% CuO, sintered at 875 C for 2 h, exhibited good microwave dielectric properties, with a relative permittivity of 61.47, a quality factor of 4256 GHz and a temperature coefficient of resonant frequency of -9.25 ppm/C. 16 refs.