کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1525502 | 995356 | 2010 | 4 صفحه PDF | دانلود رایگان |

The microwave dielectric properties of the (1 − x)(Mg0.95Co0.05)2TiO4–xCa0.8Sm0.4/3TiO3 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, respectively. The microwave dielectric properties are strongly related to the density and the matrix of the specimen. Combining (Mg0.95Co0.05)2TiO4 (spinel structure) and Ca0.8Sm0.4/3TiO3 (perovskite structure) forms a two-phase system and leads to a near-zero τf. With increasing x, the Q × f of the specimen decreased, whereas its ɛr increased due to a compositional variation. A new microwave dielectric 0.8(Mg0.95Co0.05)2TiO4–0.2Ca0.8Sm0.4/3TiO3, possessing excellent microwave dielectric properties with a dielectric constant (ɛr) of 20.84, a Q × f of 112,600 GHz (where f = 9.1 GHz, is the resonant frequency) and a τf value ∼0.8 ppm K−1 at 1573 K/4 h, is proposed as a candidate material for GPS patch antennas and 3G passive components.
Journal: Materials Chemistry and Physics - Volume 120, Issue 1, 15 March 2010, Pages 217–220