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Erschienen in:
01.11.2013
Phase structures and microwave dielectric properties of xCaTiO3–(1 − x)Sm0.9Nd0.1AlO3 ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 11/2013
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Abstract
The xCaTiO3–(1 − x)Sm0.9Nd0.1AlO3 (0.25 ≤ x ≤ 0.85) microwave dielectric ceramics were prepared by conventional solid state reaction method. The phase structures were characterized by X-ray diffraction, scanning electron microscope and Raman spectra. Solid solutions with the orthorhombic perovskite structure with octahedral tilting were formed from the x range of 0.25 to 0.85. Microwave dielectric properties of xCaTiO3–(1 − x)Sm0.9Nd0.1AlO3 ceramics were investigated systematically. The optimum property of the ceramics was obtained for x = 0.65 sintered at 1,415 °C for 3 h: relative permittivity εr = 39.70, Q × f = 50,012 GHz, τ
f
= −6.8 ppm/°C. xCaTiO3–(1 − x)Sm0.9Nd0.1AlO3 ceramics provide a new promising material for application in the microwave technology with relative permittivity lying within the range from 39 to 44, high quality factor and near-zero τ
f
.