Electron Paramagnetic Resonance of ${\mathrm{Gd}}^{3+}$ in Zircon Structures. II. YV${\mathrm{O}}_4$, YP${\mathrm{O}}_4$, YAs${\mathrm{O}}_4$

The EPR spectrum of ${\mathrm{Gd}}^{3+}$ in the three zircon hosts YV${\mathrm{O}}_4$, YP${\mathrm{O}}_4$, and YAs${\mathrm{O}}_4$ has been analyzed and shown to fit a tetragonal spin Hamiltonian. Crystal-field parameters are given. The technique for determining the absolute sign of the axial parameters is shown.