Abstract
Not only the optical properties, but the microwave dielectric properties of Yttrium aluminium garnet (Y3Al5O12, YAG) ceramics prepared by co-precipitation method combined with spark-plasma sintering (SPS) were investigated by means of adjusting the factors of LiF additive, Nd dopant, and SPS process parameters. Results showed that the in-line transmittance of YAG ceramic with LiF sintered at 1360°C was 81.8% in the infrared range. With increased sintering temperature, the quality factor (Q×f) and dielectric constant (εr) values of the pure YAG ceramics increased to the maximum and then decreased. The optimal microwave dielectric properties (Q×f=89,810GHz, εr=10.63 and τf=−51.4ppm/°C) are achieved for transparent YAG ceramics sintered at 1360°C. The Q×f values of Nd:YAG ceramics were lower than those of the pure YAG ceramics. The optimal microwave dielectric properties of 2at.%Nd:YAG ceramic cylinder can be obtained with the Q×f of 64,026GHz, εr of 10.2 and τf of −64.8ppm/°C.
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