Possible Transition in D-Valine and L-Valine Single Crystal Samples

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.