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Effect of Cation Arrangement on the Magnetic Properties of Lithium Ferrites (LiFeO2) Prepared by Hydrothermal Reaction and Post-annealing Method |
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| Authors: | Mitsuharu Tabuchi Satoshi Tsutsui Christian Masquelier Ryoji Kanno Kazuaki Ado Ichiro Matsubara Saburo Nasu Hiroyuki Kageyama |
| Institution: | aOsaka National Research Institute, 1-8-31 Midorigaoka, Ikeda, Osaka, 563, Japan;bOsaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka, 560, Japan;cLaboratoire de Chimie des Solides, Université Paris XI Orsay, Batiment 414, 91405, Orsay Cedex, France;dKobe University, Rokkoudai-cho, Nada, Kobe, Hyogo, 657, Japan |
| Abstract: | The magnetic properties of several LiFeO2polymorphs (different cation arrangements in a cubic close-packed oxygen structure) have been examined by magnetic susceptibility measurements and Mössbauer spectroscopy. Samples with relatively low ferromagnetic impurity levels have been obtained by hydrothermal reaction of FeCl3·6H2O or FeOOH with LiOH·H2O and subsequent annealing in air.α-NaFeO2with no detectable ferromagnetic impurity has been obtained by hydrothermal reaction ofα-FeOOH and NaOH. Whileα-NaFeO2revealed only one anomaly at 11 K (Néel point) in the magnetic susceptibility–temperature curves, each LiFeO2sample shows two anomalies (40–50 and 90–280 K). Mössbauer data confirm that iron is present in the high-spin 3+ state according to the values of the internal field at 4.2 K and isomer shifts at 300 K. The relationship between the cation arrangements and the Néel temperature is discussed for LiFeO2. |
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