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
       
(a) Real part of dielectric function ε 1( ω ); (b) imaginary part of dielectric function ε 2( ω ); (c) refractive index n ( ω ); (d) extinction coefficient k ( ω ); (e) energy loss function and (f) reflectivity of LN at (0 and 16 GPa) for the R 3 c phase, and (30 and 40 GPa) for the Pnma phase, respectively.