Pre-treated and treated hydrothermal preparation of NaVP2O7•H2O crystalline material and its characterization

NaVP(2)o(7)-H(2)o crystalline material was synthesized by a hydrothermal technique at moderate P-T condition. The resultant material was characterized by SEM, powder XRD, DTA, FTIR and magnetic susceptibility studies. Powder X-ray studies revealed that the NaVP(2)o(7)center dot H2O compound has crystallized in monoclinic system with cell parameters a=22.1737, b=8.0520, c=11.4670 angstrom, beta=103.751, V=1988.66 angstrom(3). Repetitive hydrothermal treatment of the material yielded improved size and quality of crystals. Magnetically this material is paramagnetic; however the u(eff) decreased as the size of the crystals increased. (c) 2005 Elsevier B.V. All rights reserved.