| DYNAMIC PROCESS OF VALENCE CHANGE OF EUROPIUM ION IN EUROPIUM DIFLUORIDE AT HIGH TEMPERATURE |
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| 作者姓名： | 石春山 叶泽人 韩平 王鸿燕 |
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| 作者单位： | Changchun Institute of Applied Chemistry，Academia Sinica，Changchun Institute of Applied Chemistry，Academia Sinica，Changchun Institute of Applied Chemistry，Academia Sinica，Changchun Institute of Applied Chemistry，Academia Sinica |
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| 基金项目： | Project supported by the National Natural Science Foundation of China. |
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| 摘 要： | The dynamic process of the ionic valence changing from Eu~(2+) to Eu~(3+) in EuF_2 at high temperature has been investigated by ESCA, high,temperature X-ray diffraction, high temperature spectrum, high temperature magnetic Isusceptibility and Mssbauer spectrum. It has been shown that the formed Eu~(3+) exists in different compounds when EuF_2 is heated to high temperature in different atmospheres. In air, Eu~(3+) exists in the form of hexagonal EuOF, in nitrogen, in the form of orthogonal EuF_3 and non-hexagon EuOF. This is because decomposition or disproportionation of EuF_2 is different with different atmospheres. The magnetic susceptibility measurement showed quantitatively that the change rate from Eu~(2+) to Eu~(3+) is about 95% in air, and about 75% in nitrogen when it is heated to 900℃. A small amount of Eu~(2+) coexists with Eu~(3+) in the final product.
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DYNAMIC PROCESS OF VALENCE CHANGE OF EUROPIUM ION IN EUROPIUM DIFLUORIDE AT HIGH TEMPERATURE |
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| SHI CHUN-SHAN YE ZE-REN HAN PING AND WANG HONG-YAN.DYNAMIC PROCESS OF VALENCE CHANGE OF EUROPIUM ION IN EUROPIUM DIFLUORIDE AT HIGH TEMPERATURE[J].Science in China(Chemistry),1989(6). |
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| Authors: | SHI CHUN-SHAN YE ZE-REN HAN PING AND WANG HONG-YAN |
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| Abstract: | |
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| Keywords: | europium difluoride high temperature X-ray diffraction high temperature susceptibility Mssbauer spectrum |
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