Sm-Ru-Ge system at 1070 K

Phase equilibria in the Sm-Ru-Ge system were investigated by X-ray powder diffraction and the isothermal section at 1070 K was obtained. We confirmed the compounds CeGa2Al2-type SmRu2Ge2 [a = 0.4229(1) nm, c = 0.9933(2) nm, space group I4mmm, No. 139], Y3Co4Ge13-type Sm3Ru4Ge13 [a = 0.9016(1) nm, space group Pm3n, No. 223], La3NiGa2-type Sm3Ru2Ge2 [a = 0.5620(1) nm, b = 0.7808(1) run, c = 1.3567(2) nm, space group Pbcm, No. 57], U2Co3Si5-type Sm2Ru3Ge5 [a = 0.9878(6) nm, b = 1.2437(8) nm, c = 0.5791(4) nm, space group Ibam, No. 72] and Zr2CoSi2-type Sm2RuGe2 [a = 1.0948(3) nm, b = 1.0839(3) nm, c = 0.4302(1) nm, gamma = 123.23(2)degrees, space group B2/m, No. 12-1]. We found the following new compounds: TiNiSi-type SmRuGe [a = 0.7165(1) nm, b = 0.4476(1) nm, c = 0.7152(1) nm, space group Pnma, No. 62], CeRh1-xGe2+x-type Sm2RuGe5-x [a=0.4061(2) nm, b=0.4179(2) nm, c=1.6226(7) nm, space group Pmmn, No. 59-2], Cr5B3-type Sm5Ru2Ge [a=0.7736(4) nm, c=1.3426(8) nm, space group I4/mcm, No. 140] and Tb3Co2Ge4-type Sm3Ru2Ge4 [a = 1.0899(9) nm, b = 0.8139(8), c = 0.4319(3) nm, gamma = 109.29(7)degrees, space group B2/m, No. 12-1]. The melting temperature for Sm2Ru3Ge5 [T-m=1760(10) K], Sm3Ru4Ge13 [T-m = 1600(10) K], Sm3Ru2Ge2 [T-m = 1560(10) K] and Sm2RuGe2 [T-m = 1750(10) K] were measured. (C) 2003 Elsevier B.V. All rights reserved.