Far Infrared Reflection Spectra of Ba(Zn,Ta)O ₃ ‐BaZrO ₃ Dielectric Resonator Material

Abstract

The dielectric ceramic materiala Ba(Zn 1/3 Ta 2/3 )O 3 –BaZrO 3 has extremely low dielectric loss at microwave frequencies. To investigate the lattice vibrations of Ba(Zn,Ta)O 3 and Ba(Zr, Zn, Ta)O 3 solid solutions, far infrared reflection spectra were measured from 50 to 4000 cm −1 using a Fourier transform infrared spectrometer. These data were analyzed according to the classical dispersion theory. The spectra of Ba(Zn,Ta)O 3 are well fitted by using the 14 resonant modes, and the spectra of Ba(Zr, Zn, Ta)O 3 solid solution are fitted by assuming the normal distribution on resonant frequencies. The damping constant of these materials is discussed, and the values of tan δ calculated from the dispersion parameters agree with the measured values.