BaMg（1-x）/3）ZrxNb2（1-x）/3）]O3微波介质陶瓷的红外光谱

利用传统固相陶瓷烧结工艺在1520℃下制备BaMg（1-x）/3ZrxNb2（1-x）/3]O3（BMZN,x=0,0.10,0.15）微波介质陶瓷.通过远红外光谱（FIR）来分析研究B位Zr4＋取代对BMN陶瓷晶体结构和介电性能的影响.研究发现,随着Zr4＋取代的增加,红外光谱上在370 cm-1附近的振动模发生分裂而出现新的极化模式;410 cm-1附近的振动模消失;230,290和510 cm-1附近的振动模的频率向高波数偏移且强度明显降低.这些红外振动模的变化表明随着Ba Zr O3的增加,陶瓷的晶体结构发生转变,由六方晶系逐步转变为立方晶系.分析了陶瓷介电性能与红外模式的内在联系.

Far-infrared reflection study of BaMg（1-x）/3）ZrxNb2（1-x）/3）]O3 microwave dielectric ceramics

BaMg（1-x）/3）ZrxNb2（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.