Abstract
Ba[Mg(1- x )/3Zr x Nb2(1- x )/3]O3 (BMZN, x =0, 0.10, 0.15) microwave dielectric ceramics were synthesized at 1520℃ using the conventional solid-state sintering technique. Effect of Zr4+ substitution on crystal structures and dielectric properties of the BMZN ceramics was studied by far-infrared spectroscopy (FIR). The results show that with increasing Zr4+ concentration the IR active modes near 370 cm-1 split and new phonon modes appear; the IR active modes near 410 cm-1 disappear; the frequencies of the IR active modes near 230, 290 and 540 cm-1 shift towards high frequency and the intensities of these modes decrease. Studies about the FIR spectra show that with increasing Zr4+ concentration the crystal structures of the BMZN ceramics transformed from hexagonal to cubic structure. The correlations between dielectric properties and IR modes were established with vibration modes as the media.
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