| 硫酸锂钾的室温相和低温相的锂离子位置 |
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| 引用本文： | 孟庆安,曹琪娟.硫酸锂钾的室温相和低温相的锂离子位置[J].物理学报,1983,32(4):525-529. |
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| 作者姓名： | 孟庆安 曹琪娟 |
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| 作者单位： | 中国科学院物理研究所 |
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| 摘 要： | 核磁共振实验表明,LiKSO4在Tc=195K发生结构相变。本文报道了温度低于Tc时,Li位电场梯度张量的温度依赖关系。结合理想离子晶体模型,讨论了该晶体的结构,指出室温相Li的位置并不像Bradley所推测的,在(2/3,1/3,0.849)的位置,而应在(2/3,1/3,0.706)的位置;195K的相变是由于Li离子的位移造成;低温相的空间群可能为R3。
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| 收稿时间： | 7/9/1982 12:00:00 AM |
THE Li SITES IN THE RT AND LOW TEMPERATURE PHASES OF LiKSO4 CRYSTALS |
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| Meng Qing-an and Cao Qi-juan.THE Li SITES IN THE RT AND LOW TEMPERATURE PHASES OF LiKSO4 CRYSTALS[J].Acta Physica Sinica,1983,32(4):525-529. |
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| Authors: | Meng Qing-an and Cao Qi-juan |
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| Abstract: | A structural phase transition in crystal LiKSO4 at Tc = 195 K was confirmed by NMR experiment previously. In this article, the temperature dependence of the electric field gradient tensor at lithium site in the range of 110-300 K is reported, and combined with a simplified ion crystal model the crystal structure is discussed. It is shown that even in the room temperature phase, the lithium position should be at (2/3, 1/3, 0.706) instead of the position at (2/3, 1/3, 0.849) suggested previously by Bradley. The phase transition is attributed to the displacement of lithium ions. The space group of the low temperature phase may be R3. |
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