FE-57 MOSSBAUER STUDY OF TERNARY ALLOY SYSTEMS FE(SB1-XTEX)(2) FOR -LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1.0 AT 4.2 K

We report on low-temperature (4.2 K) Fe-57 Mossbauer studies of the te rnary alloy system Fe(Sb1-xTex)(2) for 0.5 less than or equal to x les s than or equal to 1.0. The Mossbauer spectra are electric-quadrupole doublets for all the specimens, indicating a non-magnetic character. T he quadrupole splitting decreases with the increase in tellurium conce ntration. FeTe2 has also been studied in external magnetic fields up t o 6 T. These experiments show that the electric-field gradient in this alloy is negative and has an asymmetry parameter of eta approximate t o 0.7.