抄録
ESR spectra of Cr3+ ions doped in RbH3(SeO3)2 were analysed in the paraelectric phase. The principal values and their direction cosines of D tensor were determined with D=−2800 gauss and E=−830 gauss. From the analysis of the D tensor, the doped site of Cr3+ ion and the vacant sites of H+ ions were determined. It has been also confirmed from the temperature dependences of ESR line shapes that for RbH3(SeO3)2 containing 0.1 mol% of Cr2(SO4)3·15H2O, an incommensurate phase is really existing above Tc.
