Synthesis of Novel Chromium Oxide Using Hydrothermal Method and Analysis of its Magnetism and Structure
We have discovered a novel compound Na0.12CrO2Ge0.18Ox•yH2O using a hydrothermal method. Its powder X-ray diffraction reveals a monoclinic unit cell with lattice parameters: a = 7.260 Å, b = 2.950 Å, c = 5.117 Å and β = 103.7°. A Rietveld analysis shows that this compound has a layered structure based on CrO2 sheets consisting of edge-shared CrO6 octahedra. Such a layered structure is commonly seen in many hexagonal Cr oxides such as NaCrO2. A heat treatment at 100 °C modifies the crystal structure without destruction of a layered structure based on Cr triangular-lattice, because H2O molecules among the CrO2 sheets are removed at high temperature. Magnetization measurements reveal a spin-glass behavior below Tg = 3 K.
J.-L. Bobet, B. Chevalier and D. Fruchart
S. Ogawa et al., "Synthesis of Novel Chromium Oxide Using Hydrothermal Method and Analysis of its Magnetism and Structure", Solid State Phenomena, Vol. 170, pp. 29-32, 2011