Electron paramagnetic resonance investigation of K3H(SO4)2 proton conductor doped with Cr5+ ion Original Research Article

The proton arrangement around SO4 units in K3H(SO4)2 (KHS) was studied in detail by X-band CW EPR spectra of CrO43− paramagnetic centre incorporated into KHS during the crystal growth process. The EPR data prove the theoretical model of coherent motion of protons and SO4 units at the fast-proton conducting phase proposed by Ito and Kamimura.