Synthesis and structural characterization of CsAg5Se3 and RbAg3Te2

The syntheses and structure determinations of CsAg5 Se-3 (I) and RbAg3Te2 (II) are reported. Both compounds were prepared by using supercritical ethylenediamine at 300 degreesC for 6 days reacting alkali polychalcogenides with silver. For the compound I; tetragonal space group P4(2)/mnm, a = 14.083(2)Angstrom, c = 4.410(2)Angstrom, V = 874.5(4)Angstrom (3), Z = 4, D = 6.905 Mg/m(3), MoK alpha radiation, lambda = 0.71073, mu = 27.493 mm(-1), F(000) = 1568, R = 0.022, Rw = 0.026 for 472 independent reflection. For compound II; monoclinic space group C2/m, a = 17.546(2)Angstrom, b = 4.617(2)Angstrom, c = 9.165(2)Angstrom, beta = 113.04(2)degrees V = 683.31(12)Angstrom (3), Z = 2, D = 6.457 Mg/m(3), MoK alpha radiation, lambda = 0.71073, mu = 23.825 mm(-1), F(000) = 1128, R = 0.019, Rw = 0.027 for 690 independent reflection.