Abstract
Far-infrared reflectivity spectra for Ba(Mg 1/3,Ta 2/3)O 3 and Ba([Mg 1− x Zn x ] 1/3,Ta 2/3)O 3 ceramics were measured and eigen frequencies and damping constants of lattice vibration were calculated. In this paper, decrease of Qf value by Zn substitution was analyzed using the vibration parameters. These ceramics were prepared by conventional solid phase reaction using high purity reagents. The observed reflectivity spectra were fitted by 16 IR active modes predicted by factor group analysis in order to estimate the vibration eigen frequencies and damping constants. A slight change of reflectivity appeared in the low frequency region, and it was found that there was certain correlation between the changes of dielectric loss and damping constants in lattice vibration in 4th and 5th modes. The decrease of Qf value might be caused by the correlation in this system.
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