| Autor: |
Yang Ding, Jian Xu, Prewitt, Charles T., Hemley, Russell J., Ho-kwang Mao, Cowan, John A., Jianzhong Zhang, Jiang Qian, Vogel, Sven C., Lokshin, Konstantin, Yusheng Zhao |
| Předmět: |
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| Zdroj: |
Applied Physics Letters; 1/31/2005, Vol. 86 Issue 5, p052505, 3p, 3 Graphs |
| Abstrakt: |
Neutron diffraction measurements have been performed on polycrystalline Fe1-xO (wüstite) up to 20.3 GPa using a large-volume moissanite anvil cell at room temperature to examine the existence of long-range magnetic ordering in the high-pressure rhombohedral phase of the material. This investigation is crucial for understanding the nature of high-pressure phase transitions in Fe1-xO. Low temperature ambient pressure neutron diffraction measurements on the same sample were also conducted at 190, 180, and 85 K to compare with the high-pressure results. Magnetic peaks are expected to be observed under pressure similar to those at 180 K at ambient pressure. However, no magnetic peaks were evident in the high-pressure diffraction patterns (to 20.3 GPa at 300 K). The absence of magnetic peaks indicates the absence of long-range magnetic order in Fe1-xO under these conditions. This result indicates the need to reconsider the interpretation of high-pressure Mössbauer studies and the mechanism of the high-pressure phase transitions in Fe1-xO. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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