Paper Title:
Synthesis of Novel Chromium Oxide Using Hydrothermal Method and Analysis of its Magnetism and Structure
| Periodical | Solid State Phenomena (Volume 170) |
|---|---|
| Main Theme | Solid Compounds of Transition Elements |
| Edited by | J.-L. Bobet, B. Chevalier and D. Fruchart |
| Pages | 29-32 |
| DOI | 10.4028/www.scientific.net/SSP.170.29 |
| Citation | Shintaro Ogawa et al., 2011, Solid State Phenomena, 170, 29 |
| Online since | April, 2011 |
| Authors | Shintaro Ogawa, Koji Okuta, Hirohiko Sato |
| Keywords | Cr Oxide, Frustration, Heat Treatment, Layered Compound, Spin Glass, Triangular Lattice |
| Price | US$ 28,- |
View full size
Abstract
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.
