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Possible Transition in D-Valine and L-Valine Single Crystal Samples |
| YANG Hongshun;LOU Fengming;WANG Wenqing1;SHENG Xiangrong1;ZHUANG Zhizhong;SHI Lei2;CHEN Zhaojia
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| Department of Physics, University of Science and Technology of China, Hefei 230026
1Department of Technical Physics, Peking University, Beijing 100871
2The Center of Structure & Element Analysis, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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YANG Hongshun, LOU Fengming, WANG Wenqing et al 1995 Chin. Phys. Lett. 12 297-300 |
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Abstract The specific heats and temperature dependence of the x-ray powder diffractions for the D-valine and the L-valine single crystal samples have been studied. It is found that there is a specific heat jump at 272.0K for the D-dine samples but no jump at the same temperature for the L-dine sample. The lambda like transition means that the co-operative effect is involved in this transition. There is no crystal structure transition in the temperature range of 123-293K for the D-dine sample. The transition of the D-valine sample might be the possible D-L transition which is proposed by Abdus Salam.
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| Keywords:
65.40.Em
65.40.Hq
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Published: 01 May 1995
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