Abstract
The microstructures and the microwave dielectric properties of 0.7(SryCa1−y)TiO3–0.3(SmxNd1−x)AlO3 (7SCT–3SNA) ceramics system prepared by conventional solid-state route were investigated. X-ray powder diffraction results showed solid solutions with the perovskite structure were completely formed within the entire observation x range, and the unit cell volume of 0.7CaTiO3–0.3(SmxNd1−x)AlO3 (7CT–3SNA) ceramics decreased with increasing x value. The substitution of Nd3+ by Sm3+ could enhance the densification of 7CT–3SNA ceramics, and consequently improve the dielectric properties of the ceramics. When x = 0.75, specimens exhibited excellent microwave dielectric properties with er ~ 44.52, Q × f value ~40,110 and τf value ~−1 ppm/°C. For further improving the microwave dielectric properties of the samples, Ca2+ in 0.7CaTiO3–0.3(SmxNd1−x)AlO3 were partially substituted by Sr2+. The results showed that the replacement of Ca2+ by Sr2+ effectively enhanced the densification of specimens. By optimizing the composition, the ceramics with y = 0.01 in 0.7(SryCa1−y)TiO3–0.3(Sm0.75Nd0.25)AlO3 (7SCT–3SNA) showed high relative density and dense and uniform microstructures as well as well-developed grain growth with superior microwave dielectric properties: er ~ 45.38, Q × f value ~41,730 and τf value ~−0.2 ppm/°C.
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