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研究了YbI_2-NaI,YbI_2-KI 体系相图,分别在536℃、504℃得到固液异组成化合物NaYbI_5、KYbI_3。YbI_2-NaI、YbI_2-KI两体系低共熔点分别为517℃、455℃,其低共熔体组成的摩尔百分数分别为54％(NaI)、64％(KI)。NaYb_2I_5的晶体结构(为TlPb_2CI_5型单斜晶系)与KSm_2I_5同晶,空间群P2_(1/C),晶胞参数a_0=10.005(3)A,b_0=8.912(2)A,c_0=14.276(7)A,β=90.9°,Z=4,Dx=5.237g·cm~(-3),MV=191.66cm~3/mol;KYbI_3的晶体结构属GdFeO_3型,正交晶系,空间群Pbnm,晶胞参数 a_0=8.363(2)A,b_0=8.510(2)A,c_0=11.697(2)A,Z=4,Dx=4.73g·cm~(-3),MV=125.33cm~3/mol。
The phase diagrams of YbI_2-NaI and YbI_2-KI systems were studied. NaYbI_5 and KYbI_3 were obtained at 536 ℃ and 504 ℃, respectively. The eutectic points of YbI_2-NaI and YbI_2-KI systems were 517 ℃ and 455 ℃, respectively. The mole percentages of the two systems were 54% (NaI) and 64% (KI), respectively. The crystal structure of NaYb_2I_5 is the same as that of KSm_2I_5, the space group P2_ (1 / C), the unit cell parameters a_0 = 10.005 (3) A, b_0 = 8.912 (2) A and c_0 = 14.276 (TlPb_2CI_5 monoclinic system) 7) A, β = 90.9 °, Z = 4, Dx = 5.237g · cm -3, MV = 191.66cm -3 / mol. The crystal structure of KYbI_3 belongs to the GdFeO_3 type, orthorhombic and space group Pbnm , Cell parameters a_0 = 8.363 (2) A, b_0 = 8.510 (2) A, c_0 = 11.697 (2) A, Z = 4, Dx = 4.73 g · cm -3, MV = 125.33 cm -3 / mol.