ELECTRON-PARAMAGNETIC-RESONANCE OF SOME LANTHANIDE IONS IN YTTRIUM AND LUTETIUM VANADATE

The electron paramagnetic resonance (EPR) parameters have been determi ned for the trivalent ions neodymium, erbium and ytterbium, at low abu ndance in lutetium vanadate. Crystal field splittings produce ground s tates which are Kramers doublets, and measurements were made of the g- values both parallel and perpendicular to the tetragonal axis; they ar e compared with previous measurements in yttrium vanadate. Two of the crystal field splitting parameters of the trivalent gadolinium ion (S = 7/2) in LuVO4 show noticeable difference from those in YVO4.