Single crystal EPR study of Mn(II) doped MgRb 2 (SO 4 ) 2 ·6H 2 O: A case of interstitial site

Single crystal electron paramagnetic resonance studies on magnesium rubidium sulphate hexahydrate doped with Mn(II) impurity, in the form of 0.1% of manganous chloride, are carried out at room temperature. The angular variation spectra of the crystal in the three orthogonal planes show that the paramagnetic impurity Mn(II) has entered the host lattice interstitially. The spin Hamiltonian parameters calculated are: g xx = 1.974, g yy = 1.928, g zz = 1.980; A xx = 9.28, A yy = 8.58, A zz = 9.87 mT and D xx = ‐18.71, D yy = ‐5.59, D zz = 24.30 mT. The room temperature and liquid nitrogen temperature study for polycrystalline sample indicate no phase transition. The percentage covalency of Mn–O bond has been estimated to be 11. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)