Peculiarities of component interaction in {Gd, Er}-V-Sn Ternary systems at 870 K and crystal structure of RV_6Sn_6 stannides

摘要

The phase equilibria in the Gd-V-Sn and Er-V-Sn ternary systems were studied at 870 K by means of X-ray and metallographic analyses in the whole concentration range. Both Gd-V-Sn and Er-V-Sn systems are characterized by formation of one ternary compound at investigated temperature, with stoichiometry RV_6Sn_6 (SmMn_6Sn_6-type, space group P6lmmm, a = 0.55322(3)nm, c= 0.91949(7) nm for Gd, a = 0.55191(2) nm, c = 0.91869(8) nm for Er). Solubility of the third component in the binary compounds was not observed. Compounds with the SmMn_6Sn_6-type were also found with Dy, Ho, Tm, and Lu, while YV_6Sn_6 compound crystallizes in HfFe_6Ge_6 structure type. All investigated compounds are the first ternary stannides with rare earth elements and vanadium.