Study on Ultrasonic Anomaly with Nonstoichiometry of Sintered Magnetite near Verwey Transition Temperature
| Autor: | Hiroaki Kamioka, Nobuo Kashiwagura, Shiun Sakai |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Condensed matter physics Attenuation Transition temperature General Engineering General Physics and Astronomy Sintering Mineralogy Atmospheric temperature range Shear (sheet metal) Charge ordering chemistry.chemical_compound chemistry Elastic modulus Magnetite |
| Zdroj: | Japanese Journal of Applied Physics. 41:3176-3180 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.1143/jjap.41.3176 |
| Popis: | Compressional and shear wave velocities and attenuation in magnetite, which was sintered in N2 gas atmosphere, were accurately measured to investigate the Verwey transition by the pulse transmission method using a dual acoustic path across the temperature range between 78 K and 300 K. The temperature dependence of the compressional and shear wave velocities of the sintered magnetite exhibited a depression at ~ 85 K. The low transition temperature corresponds to a large nonstoichiometry very close to the oxidation limit of magnetite. Using the measured ultrasonic data, the elastic properties of sintered magnetite are discussed. |
| Databáze: | OpenAIRE |
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