Magnetic resonance study of the crystal symmetry of praseodymium bromate nonahydrate

Abstract
Electron spin resonance measurements on Nd ions in Pr(BrO3)39H2O (PrBR) have been carried out at 4.2 K to examine the symmetry of the rare‐earth sites. The results are not compatible with recent diffraction studies which identified the crystal as hexagonal with D3h rare‐earth site symmetry. The spectra show a large number of inequivalent sites with probably only reflection symmetry, repeating every 60° in the plane perpendicular to the long axis of the crystal. These results appear to be consistent with the twinned pseudohexagonal C122v structure also proposed for this compound.