STRUCTURAL-CHANGES IN AMORPHOUS FE80-XRXB20 (R = Y, SM, PR) ALLOYS

The radio-frequency (rf) collapse of the magnetic hyperfine structure in the Mossbauer spectra is employed to study changes in the short-ran ge order in amorphous metals via the electric quadrupole hyperfine int eraction. The structural changes in amorphous Fe80-xRxB20 (where R = Y , Sm, Pr) alloys were studied in detail as a function of x. It was fou nd that such substitutions induce considerable changes in the short-ra nge order. A low concentration of substituting atoms (x < 4) causes a large distortion of the nearest surroundings of Y, Sm and Pr atoms. La rger contents (x > 4) lead to collective changes in the structure.