Abstract
The microstructure and microwave dielectric characteristics of (Ba0.98Sr0.02)3.75Nd9.5Ti18−x(Zn1/3Nb2/3)xO54 ceramics solid solutions (0 ≤ x ≤ 2.5) were investigated in this study. X-ray diffraction indicated that only BaNd2Ti4O12 existed in the sintered samples when x value was lower than 2.0, but subsequently a new phase generated with increasing of x value. The dielectric constant (er) of the samples increased slightly from 83.4 to 85.2 before falling down and quality factor value (Q × f) declined radically from 10,873 to 1321 GHz at optimum sintering temperature of 1450 °C, as x value increased from 0.0 to 2.5. And the temperature coefficient of resonant frequency (τf) could be adjusted to a minimum value and then rebounded because of the second phase NdNbTiO6 which also sharply deteriorated the quality factor of the samples. At last, the excellent microwave dielectric properties of the samples with values of er = 85.2, Q × f = 5989 GHz, τf = +14.9 ppm/°C were obtained as x was 1.0 sintered at 1450 °C for 3 h in air.
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