By Richard L. Cohen (Eds.)
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Additional info for Applications of Mössbauer Spectroscopy
1 -4 . PD J pQrqriKWtic Hi •12 in v I 0 1 1 4 1 1 β Pmak. 1 ! 12 VELOCITY (mm/sec) Fig. 6. Mössbauer spectra of Vicalloy at room temperature in different phases—(a) rolled after quenching from ~ 9 5 0 ° C ; (b) after heat treatment for permanent magnet properties. The main changes observed in the heat-treated state (b) as compared with as-quenched (a) are the occurrence of a paramagnetic absorption peak, a higher interval field, and a narrowing 5 7 of the absorption lines. The source was C o in palladium.
This spectrum was interpreted as the superposition of three six-line spectra associated with iron atoms with zero, one, or two nn or nnn molybdenum atoms. The decomposition of the alloy u p o n heat treatment may be understood by reference to the equilibrium phase diagram. At 910°C, the alloy is homogeneous, single phase, but upon quenching and subsequent annealing at lower temperatures, 48 L. H. 00 (MM/SEC) F i g . 4. Mössbauer spectrum of F e - 6 at. % M o alloy quenched from 1050°C. ) a precipitate of composition F e 2 M o or F e 3 M o 2 is expected, depending on aging temperature, with a matrix depleted of molybdenum.
The simplest example of such a miscibility gap is shown in Fig. 3. 0 (c) F i g . 3. Schematic temperature-composition phase diagram showing miscibility gap (solid line) and chemical spinodal (dashed line). The cross-hatched region is characterized by nucleation and growth, while the decomposition below the dashed line is via the spinodal mechanism. the equilibrium solid solubility, while the dashed line, the locus of zeroes of the second derivative of chemical free energy with composition, is the spinodal.