Crystal structure and EPR of the RbNd(WO4)2 single crystal

Crystal structure and EPR spectra in a RbNd(WO4)(2) single crystal have been studied. RbNd(WO4)2 crystallizes in the monoclinic structure with the unit cell parameters: a = 10.792(2) angstrom, b = 10.673(2) angstrom. c = 7.6703(15) angstrom, beta = 130.51(3)degrees. Using the X-ray diffraction measurements, the fractional atomic coordinates, displacement parameters and interatomic distances have been determined. The EPR spectra are described in terms of the main g-tensor values: g(z) = 3.291 +/- 0.005: g, = 0.726 +/- 0.005 g, = 1.533 +/- 0.005. Both the magnetic dipole-dipole and isotropic exchange interactions have been calculated. The exchange interactions are shown to exceed the magnetic dipole-dipole interactions and to have an opposite sign. These results suggest an appeareance of an antiferromagnetic ordering in RbNd(WO4)(2) at low temperatures. (c) 2005 Elsevier B.V. All rights reserved.