Hyperfine-field distribution inFe3Si1−xAlxalloys and a theoretical interpretation

In ${\mathrm{Fe}}_3{\mathrm{Si}}_{1-x}{\mathrm{Al}}_x$ alloys with small $x$ the Si and Al nuclear magnetic resonances are 31.5 and 16.1 MHz, respectively. The concentration dependences of the frequencies of these resonances are linear, the Si resonance shifting to lower frequencies, the Al resonance to higher frequencies. Both the magnitudes and concentration dependences of the Si and Al internal fields are in agreement with the predictions of a simple model which Jena and Geldart, following the approach of Daniel and Friedel, have found successful in calculating the fields of $\mathrm{sp}$ elements in Heusler alloys. A positive sign is predicted for the Si internal field, and a negative sign for the Al field. Magnetization and lattice-parameter data required for the comparison of experiment and theory are also reported.