Dielectric relaxation and electronic spectroscopy of double potassium yttrium tetraoxophosphate(V) K3Y(PO4)2 doped by neodymium and europium ions

► Dielectric relaxation in potassium yttrium tetraoxophosphate(V) doped by 1% and 5% of Eu3+ and Nd3+ ions was investigated. ► Activated and non-activated processes were found. ► Activation energies for thermally activated processes were calculated. ► For other processes n and m coefficients were pointed out. ► Optical properties were investigated.