Lattice vibrational analysis of mantle minerals and related materials using Raman spectroscopy

铁酸钙型MgAl_2O_4和CaAl_2O_4被认为是深部地幔组分。基于高压拉曼光谱测量得到的晶格振动信息，利用晶格振动模型计算确定了它们的热容和晶格振动熵。利用相同的计算方法，重新确定了地幔中500 ~ 660 km深度最丰富的尖晶石型Mg_2SiO_4的高温热容。

The calcium ferrite-type MgAl_2O_4 and CaAl_2O_4 are expected as deep mantle constituent. Their heat capacities and lattice vibrational entropies were determined using the lattice vibrational model calculation based on the information of lattice vibrations, which were obtained from high-pressure Raman spectroscopic measurements. The high-temperature heat capacity of the spinel-type Mg_2SiO_4, which is the most abundant mineral in the depth range of 500-660 km in the mantle, was also re-determined using the same calculation method.