3d, 4d and 5d Elements, Alloys and Compounds by J.J.M. Franse, R. Gersdorf (auth.), H.P.J. Wijn (eds.)

By J.J.M. Franse, R. Gersdorf (auth.), H.P.J. Wijn (eds.)

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Extra resources for 3d, 4d and 5d Elements, Alloys and Compounds

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It was found to be similar to the room-temperature values, indicating that there is no gross change in the localized part of the spin density at this temperature [67 C 11. 3 E, 47% “) 81(l)% 53% 19(l)% Ref. 10 Ref. 71M2 71M2 71M2 ‘) The use of this crystal field model has been criticized and it is suggested that the regions of negative polarization are caused by a spin dependence of the radial part of the d electron wave function [71 D 11. ‘) Band calculations have found a variety of 4s polarization values.

5 kOe. Spin-echo and modulated continuous wave (cw) NMR techniques are used to study these materials. The Miissbauer effect measuresthe magnetic hyperline fields and electric quadrupole fields from the Zeeman splittings of the ground and excited states of the nuclear transitions. These splittings are obtained by varying the relative velocity of the source and absorber [62P l] and are given in the practical unit [mms-‘1. Miissbauer effect measurementscan not be made on Co. 4keV y-ray, is a possible but poor ME nucleus, “Fe an excellent one.

For spherical symmetry this would be 60% T,, and 40% E, ‘) A Fourier inversion of the data is in agreementwith the model consisting of a nearly spherical distribution of spin density composed of a positive spin-polarized, 3d’ 4s2 free-atom like, contribution plus a constant negative contribution. Table 2. Average magnetic moment per atom, P, for Fe in the paramagnetic state as obtained from polarized neutron scattering [83 B 23. 3(l) The characteristic neutron interaction time of theseexperiments, w lo- I3 s, is expected to be slightly longer or comparable to the localmoment spin-flipping time (sometimes referred to as the transverse spin fluctuation time [78 M2, 7911, 79 M2]).

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