Abstract
Sr1−x Nd x TiO3 (x = 0.08–0.14) ceramics were prepared by conventional solid-state methods. The analysis of crystal structure suggested Sr1−x Nd x TiO3 ceramics appeared to form tetragonal perovskite structure. The relationship between charge compensation mechanism, microstructure feature and microwave dielectric properties were investigated. Trivalent Nd3+ substituting Sr2+ could effectively decrease oxygen vacancies. This reduction and relative density were critical to improve Q × f values of Sr1−x Nd x TiO3 ceramics. For e r values, incorporation of Nd could restrain the rattling of Ti4+ cations and led to the reduction of dielectric constant. The τ f values were strongly influenced by tilting of oxygen octahedral. The τ f values decreased from 883 to 650 ppm/°C with x increasing from 0.08 to 0.14. A better microwave dielectric property was achieved for composition Sr0.92Nd0.08TiO3 at 1460 °C: e r = 160, Q × f = 6602 GHz, τ f = 883 ppm/°C.
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