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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.118  No.1384 (December) (2010)  >  pp.1135-1139

Journal of the Ceramic Society of Japan
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Tailoring microwave dielectric properties of BaTi4O9 ceramics by addition of Sm2O3

Xianli HUANG1)2), Ying SONG2), Fuping WANG1)2) and E ZHANG3)
1) Department of Applied Chemistry, Nanjing University of Aeronautics and Astronautics
2) Department of Applied Chemistry, Harbin Institute of Technology
3) Department of Mathematics, Harbin Vocational College of Science and Technology

  BaTi4O9 ceramics with Sm2O3 addition were prepared in a form of xSm2O3+BaTi4O9 (x = 1, 3, 5, 7 mol %) and the microstructures and microwave dielectric properties of the ceramic samples were characterized. SEM shows when x greater than 3 mol %, BaSm2Ti4O12 crystallized in a fiber shape along the crystalline boundary. With the increase of Sm2O3 addition, the dielectric constant increases from 36.65 to 39.8, while the quality factor decreases from 28000 to 19000, τf from +20.2 to +10.1 ppm/°C. Results of curve fitting of FIRS show extrinsic dielectric loss could account for the increase of dielectric loss, which should be attributed to the substantial increase of Ti3+ and Ti2+.

Dielectric ceramics, Dielectric loss, Lattice vibration, Titanate

Received: April 30, 2010
Accepted: June 17, 2010 , Published online: December 01, 2010
Copyright (c) 2010 The Ceramic Society of Japan



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