TY - JOUR
T1 - Low-loss microwave dielectrics in the Mg2(Ti 0.95Sn0.05)O4-(Ca0.8Sr 0.2)TiO3 ceramic system
AU - Chen, Jhih Yong
AU - Jiang, Chang Yang
AU - Huang, Cheng Liang
N1 - Funding Information:
This work was supported by the National Science Council of Taiwan under grant NSC 97-2262-E-006-013-MY3 .
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2010/7/23
Y1 - 2010/7/23
N2 - The microwave dielectric properties of the (1 - x)Mg2(Ti 0.95Sn0.05)O4-x(Ca0.8Sr 0.2)TiO3 ceramic system prepared by mixed oxide route have been investigated. The crystal structures and the microstructures of the ceramics were characterized by means of X-ray and SEM. The microwave dielectric properties are strongly related to the density and matrix of the specimen. Combination of Mg2(Ti0.95Sn0.05)O4 (spinel-structured) and (Ca0.8Sr0.2)TiO3 (perovskite-structured) forms a two-phase system and leads to a near-zero τf. With increasing x, the microwave Q × f decreased and εr increased. A new microwave dielectric material 0.91Mg 2(Ti0.95Sn0.05)O4-0.09(Ca 0.8Sr0.2)TiO3, possessing excellent microwave dielectric properties with a dielectric constant (εr) of 18.32, a Q × f of 109,200 GHz (where f = 9.5 GHz, is the resonant frequency) and a τf value ∼-0.5 ppm/°C at 1270 °C for 4 h, is proposed as a suitable candidate material for microwave applications requiring low dielectric loss.
AB - The microwave dielectric properties of the (1 - x)Mg2(Ti 0.95Sn0.05)O4-x(Ca0.8Sr 0.2)TiO3 ceramic system prepared by mixed oxide route have been investigated. The crystal structures and the microstructures of the ceramics were characterized by means of X-ray and SEM. The microwave dielectric properties are strongly related to the density and matrix of the specimen. Combination of Mg2(Ti0.95Sn0.05)O4 (spinel-structured) and (Ca0.8Sr0.2)TiO3 (perovskite-structured) forms a two-phase system and leads to a near-zero τf. With increasing x, the microwave Q × f decreased and εr increased. A new microwave dielectric material 0.91Mg 2(Ti0.95Sn0.05)O4-0.09(Ca 0.8Sr0.2)TiO3, possessing excellent microwave dielectric properties with a dielectric constant (εr) of 18.32, a Q × f of 109,200 GHz (where f = 9.5 GHz, is the resonant frequency) and a τf value ∼-0.5 ppm/°C at 1270 °C for 4 h, is proposed as a suitable candidate material for microwave applications requiring low dielectric loss.
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U2 - 10.1016/j.jallcom.2009.12.177
DO - 10.1016/j.jallcom.2009.12.177
M3 - Article
AN - SCOPUS:77955175496
SN - 0925-8388
VL - 502
SP - 324
EP - 328
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 2
ER -