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At last, our MgO–CaO–TiO 2 based ceramics with Mg:Ti = 0.955 sintered at 1,310 ☌ for 4 h showed good microwave dielectric properties: ε r = 21.1, Q × f = 79,915 GHz and τ f = 1.2 ppm/☌. Meanwhile, the temperature coefficient of resonant frequency (τ f) value first varied from −3.8 to 1.2 ppm/☌ and then maintained unchanged. As increasing the ratio of Mg:Ti, the dielectric constant (ε r) displayed down trend from 21.2 to 20.6, and the Q × f value first increased from 76,300 to 80,000 GHz, thereafter, it declined to 75,000 GHz.
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The microstructure showed the dark MgTiO 3 grains and the bright grains with three elements Mg, Ca and Ti in the triangle grain boundary. Only two phases MgTiO 3 and CaTiO 3 appeared in the sample with Mg:Ti = 0.955, and MgTi 2O 5 and Mg 2TiO 4 appeared in the sample with Mg:Ti ratio lower and higher than 0.955 respectively. Raleigh, Joined June 2012 18Following 12.
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