镧系收缩对立方Ln_2O_3Raman振动频率的影响

镧系收缩对立方Ｌｎ２Ｏ３Ｒａｍａｎ振动频率的影响薛理辉铁丽云孙育斌邓志刚林益（武汉工业大学材料研究与测试中心武汉４３００７０）ＴｈｅＤｅｐｅｎｄｅｎｃｅｏｆＲａｍａｎＶｉｂｒａｔｉｏｎａｌＦｒｅｑｕｅｎｃｉｅｓｆｏｒＣｕｂｉｃＴｙｐｅＬｎ２Ｏ３ｏｎｔ...

The Dependence of Raman Vibrational Frequencies for Cubic Type Ln 2O 3 on the Lanthanide Contraction

Abstract Raman spectra for the sesquioxides of the rare earths Gd 2O 3, Dy 2O 3, Ho 2O 3,Y 2O 3,Er 2O 3,Tm 2O 3,Yb 2O 3,Lu 2O 3, which have the cubic type (bixbyite) structure, have been measured. The spectra for these type C compounds give a well defined characteristic band in the region between 358 to 392 cm -1 , 468 to 500 cm -1 and 565 to 610 cm -1 . The frequencies are directly related to metal oxygen distances. The strongest band in the Raman spectrum shift almost linearly to lower frequencies with increasing metal ionic radii, clearly shows the effect of the lanthanide contraction. The mass of the metal atom slightly affect the frequency position. The abnormal Raman spectrum of Yb 2O 3 have been discussed.