EPR study of Cr3+ center in fast-proton conductor K3H(SO4)2

We have studied a K(3)H(SO(4))(2) (KHS) crystal doped with Cr(3+) ions by X-band continuous-wave electron paramagnetic resonance spectroscopy. The spin Hamiltonian parameters, direction cosines and coordination of the Cr(3+) impurity in the crystal matrices were determined at room temperature. The line width Delta H (pp) versus temperature and an external direct current electric field was measured. The line width anomaly of Cr(3+) is compared with our earlier results for KHS:Mn(2+) indicating the molecular mechanisms responsible for both anomalies in the 25-460 K temperature range.