Electronic and optical properties of lithium niobate under high pressure: A first-principles study*
Sang Dan-Dana), Wang Qing-Lin†b), Han Chong‡a), Chen Kai, Pan Yue-Wu
       
Calculated valence charge density distribution for (a) R 3 c phase at 0 GPa and (b) Pnma phase at 40 GPa in a plane which contains Nb, O, and Li atoms.