掺杂晶体(NH_4)_(1-x)K_xNO_3、(NH_4)_(1-x)Na_xNO_3振动模的临界行为  

The Critical Behaviours of the Vibrational Modes of Doped (NH 4) 1-x K xNO 3 and (NH 4) 1-x Na xNO 3 Crystals: the Raman Intensity Study

作　　者：王焕茹[1] 吴国祯[1] 

机构地区：[1]清华大学物理系

出　　处：《光散射学报》1997年第2期103-105,共3页The Journal of Light Scattering

摘　　要：掺杂晶体（ＮＨ４）１－ｘＫｘＮＯ３、（ＮＨ４）１－ｘＮａｘＮＯ３振动模的临界行为王焕茹吴国祯（清华大学物理系北京１０００８４）ＴｈｅＣｒｉｔｉｃａｌＢｅｈａｖｉｏｕｒｓｏｆｔｈｅＶｉｂｒａｔｉｏｎａｌＭｏｄｅｓｏｆＤｏｐｅｄ（ＮＨ４）１－ｘＫｘＮＯ...Abstract The Raman intensities of the vibrational modes of doped (K +,Na +) NH 4NO 3 during phase transitions are shown behaving as power functions of |T T c| β. The exponent, β, is mode dependent and bears much critical information of the transitions. Among the modes, the totally symmetric v 1 mode of the nitrate ion possesses the unique behaviour as a function of the degree of doping. It is also the v 1 mode which possesses the delicate potency to differentiate the different dopings with K + and Na +. It is shown that the exponents are very sensitive to the degrees of doping for very dilute doping. The physical interpretation is given in terms of the average distance between the doped ions.

关 键 词：晶体 掺杂 振动模 拉曼峰强 临界行为 

分 类 号：O734.1[理学—晶体学]