Evidence for significant structural differences between the ferromagnetic metallic glasses ${\mathrm{Fe}}_{1-x}{\mathrm{P}}_x$ and ${\mathrm{Fe}}_{1-x}{\mathrm{B}}_x$, $x\approx 0.18$

The qualitatively different line amplitude patterns in the Mössbauer Zeeman spectra for iron-boron and iron-phosphorus ferromagnetic glasses are quantitatively analyzed for the examples ${\mathrm{Fe}}_{82}$ ${\mathrm{B}}_{18}$ and ${\mathrm{Fe}}_{83}$ ${\mathrm{P}}_{17}$ in terms of correlations between isomer shift, hyperfine field, and quadrupole energy. The commonly accepted notion that these materials are all, on a local scale, basically distorted and stoichiometrically perturbed forms of the closely related tetragonal crystalline ${\mathrm{Fe}}_3$B and ${\mathrm{Fe}}_3$P structures is refuted.