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 difference charge density maps through the Nb and O atoms at 30 GPa (a) and 40 GPa (b) for Pnma phase. The purple, red, and cyan balls denote the Li, O, and Nb atoms, respectively.