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^‡

(a) Pyrophyllite block of R-9; (b) urea residue of R-9 at 20 min; (c) pyrophyllite block of R-2; (d) urea residue of R-2 at 40 min. The pressure and temperature are 0.5 GPa and 480 K, respectively.