Characteristics of urea under high pressure and high temperature
Fang Shuai, Ma Hong-An, Guo Long-Suo, Chen Liang-Chao, Wang Yao, Ding Lu-Yao, Cai Zheng-Hao, Wang Jian, Jia Xiao-Peng
       

Raman spectra at different temperatures under 0.5 GPa.