Zn_2TiO_4晶体的原位变温拉曼研究

In-situ Temperature Dependent Raman Spectra Study of Zn_2TiO_4 Crystal

研究了Zn_2TiO_4晶体在不同温度(-166℃~544℃的温度范围)下的拉曼光谱,分析了Zn_2TiO_4晶体拉曼光谱随温度变化的规律.研究表明,Zn_2TiO_4晶体的拉曼谱峰位不同程度的向低波数频移,半峰宽逐渐变宽,相对强度发生改变,位于200~600 cm-1之间的拉曼振动模式由于共振相对强度增强,拉曼峰强占据了主导地位.此外,基于多面体的近似,通过变温拉曼谱研究了Zn_2TiO_4晶体的热膨胀系数.

In-situ Raman spectra of Zn2TiO4 crystal have been investigated for temperatures ranging from-166 ℃ to 544 ℃.The temperature dependence of Raman bands of spinel Zn2TiO4 crystal have been analyzed.With the temperature increasi g,the frequencies become lower and the linewidth is wider.The relative intensity have changed.Bands in 200~600 cm-1 become stronger and dominate,due to their resonance vibration.Additionally,based on polyhedral approach,thermal expansion constant has also been discussed from temperature-dependent shift of Raman spectra.