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The RbI-SmI2 , binary system was studied with DTA and X-ray powder diffraction. Its phase diagram shows that it has a congruently melting compound,RbSm2I5 , with a melting point 524℃; an incongru-ently melting compound, Rb2SmI4 , with an inconsruently point 467℃ and two compounds, RbSmI3, and Rb3SmI5, being decomposed at 433℃ and 460℃, respectively. The measured structure of RbSm2I5 shows that it is isomorphous with NH4 Pb2 Cl5 space group P21/c, a=10 . 063(3)A, b=9.003(3)A. c =14 . 242(5)A°,β=90.23(3)°;z = 4, MVx= 1 94 . 3cm3/mol;D=5.255g/cm3 and Do =5. 334g/cm3 (25. 0℃).The structural, investigation ofRbSmI3 shows that it belongs to the orthorhombic system with a = 15.914(6)A, b=8.898(3)A c =12.193(5)A; Z=8, MVx =130.0cm3/mol, Dx =4 . 743g/cm3,Do = 4.597g/cm3(25.0℃).
The RbI-SmI2, binary system was studied with DTA and X-ray powder diffraction. Its phase diagram shows that it has a congruently melting compound, RbSm2I5, with a melting point of 524 ° C .; an incongru-ently melting compound, Rb2SmI4, with an The measured structure of RbSm2I5 shows that it is isomorphous with NH4Pb2Cl5 space group P21 / c, a = 10. 063 (for example, RbSmI3, Rb3SmI5, RbSmI3, and Rb3SmI5 are currently decomposed at 433 ° C and 460 ° C 3) A, b = 9.003 (3) A. c = 14.242 A °, β = 90.23 (3) °; z = 4, MVx = 1 94.3 cm 3 / mol; D = 5.255 g / cm 3 The structural, investigation ofRbSmI3 shows that it belongs to the orthorhombic system with a = 15.914 (6) A, b = 8.898 (3) A c = 12.193 (5) A; Z = 8, MVx = 130.0 cm3 / mol, Dx = 4.743 g / cm3, Do = 4.597 g / cm3 (25.0 ° C).