Tailoring microwave dielectric properties of BaTi4O9 ceramics by addition of Sm2O3

Xianli HUANG; Ying SONG; Fuping WANG; E ZHANG

doi:10.2109/jcersj2.118.1135

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Tailoring microwave dielectric properties of BaTi₄O₉ ceramics by addition of Sm₂O₃

Xianli HUANG, Ying SONG, Fuping WANG, E ZHANG

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Keywords: Dielectric ceramics, Dielectric loss, Lattice vibration, Titanate

JOURNAL FREE ACCESS

2010 Volume 118 Issue 1384 Pages 1135-1139

DOI https://doi.org/10.2109/jcersj2.118.1135

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Abstract

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, τ_f 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⁺.

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