β—BaB_2O_4晶体高压相变的拉曼光谱研究  

Raman Spectra Study of the Pressure-induced Phase Transition in β—BaB_2O_4 Crystal

作　　者：林远坤[1] 蓝国祥[1] 王华馥[1] 

机构地区：[1]南开大学物理系,天津300071

出　　处：《Chinese Journal of Chemical Physics》1993年第3期257-261,共5页化学物理学报（英文）

基　　金：国家自然科学基金

摘　　要：用金刚石对顶砧装置,在0-28kbar压力范围,对β—BaB_2O_4晶体进行了高压拉曼光谱研究。根据高压拉曼光谱数据,对外振动谱区谱线进行了认定。在10kbar附近,发现β—BaB_2O_4晶体发生了压力导致的结构相变。将10kbar以上122cm^(-1)谱线发生的劈裂,归因于晶体结构对称性的降低。High-pressure Raman study of the β—BaB_2O_4 crystal has been carried out from 0 to 28 kbar with a gasketed diamond anvil cell. The external vibrational modes have been assigned according to the high-pressure Raman spectra. The Raman study reveals the occurrence of pressure-induced phase transition near 10 kbar. 122 cm^(-1) peak splitted into two components at pressure above 10 kbar, this is attributed to the lower symmetry of the crystal structure.

关 键 词：偏硼酸钡 晶体 高压相变 散射谱 

分 类 号：O734[理学—晶体学]