采用固相反应技术制备了x分别为0.05、0.08和0.11的(Ta₂O₅)_1-x(TiO₂)_x陶瓷;在室温至600℃范围内,测量了这些陶瓷样品的拉曼光谱随温度的变化.随着温度的升高,拉曼光谱中位于35～38cm-1的最低频移的声子模发生软化,并随之发生结构相变.拉曼光谱和实验结果都表明:组分x分别为0.05、0.08和0.11的(Ta2O5)1-x(TiO₂)x陶瓷分别在360、450和540℃发生了由三斜至单斜相的结构相变.上述结论得到了(Ta₂O₅)0.92(TiO₂)0.08单晶热膨胀系数测量数据的支持.

(Ta₂O₅)_1-x(TiO₂)_x ceramics for x = 0 05, 0 08, and 0 11 were prepared by the conventional solid state reaction technique Raman spectra of these ceramic samples was measured in the range 20 - 600℃ Raman spectra exhibited a softening of the lowest frequency phonon mode with increasing temperature followed by a phase transition A structural transition from triclinic to monoclinic phase was observed in the ceramics at about 360, 450, and 540℃ for compositions x = 0 05, 0 08, and 0 11, respectively This conclusion is support by the thermal expansion measurement of a (Ta₂O₅) 0 92 (TiO₂) 0 08 single crystal