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標題: Effects of B2O3 addition on the microwave dielectric properties of Ba2Ti9O20 ceramics
作者: Lee, Y.C.
Lee, W.H.
Shieu, F.S.
關鍵字: Ba2Ti9O20;dielectric constant;quality factor;temperature coefficient;of resonant frequency;resonator
Project: Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers
期刊/報告no:: Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers, Volume 42, Issue 3, Page(s) 1311-1314.
Microwave characteristics of Ba2Ti9O20 ceramics added with different amounts of B2O3 and sintered at high temperatures ranging from 900 to 960degreesC for 2 h are investigated. It is found that the firing temperature required to densify the Ba2Ti9O20 ceramics is lowered by increasing the B2O3 content. The density and dielectric constants of the B2O3-added ceramics also increase with B2O3 addition. The results of X-ray diffraction (XRD) indicate the presence of five crystalline phases, Ba2Ti9O20, BaZr(BO3)(2), BaZrO3, BaTi4O9, and Zn-3(BO3)(2), in the sintered ceramics, depending upon the amount of B2O3 added. Optimum dielectric properties, i.e., Q = 1477 (Q x f = 10784), epsilon(r) = 28.3, and tau(f) = -8.2, are obtained for the Ba2Ti9O20 ceramics with 3 wt% B2O3 addition and sintering in air at 940degreesC for 2 h.
ISSN: 0021-4922
DOI: 10.1143/jjap.42.1311
Appears in Collections:工學院

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