Abstract :
[en] The structural, dielectric, dynamical, elastic, piezoelectric and nonlinear
optical (second-order susceptibility and Pockels tensors) properties of Bi2WO6 in
its P21ab ferroelectric ground state are determined using density functional theory.
The calculation of infrared and Raman spectra on single crystal allowed us to
clarify the assignment of experimental phonon modes, considering the good agreement
between the calculated and the experimental Raman spectra obtained on polycrystal.
The calculation of the elastic constants con rms the elastic stability of the crystal
and allow us to estimate the Young and shear moduli of polycrystalline samples.
The piezoelectric constants have signi cant intrinsic values comparable to those of
prototypical ABO3 ferroelectrics. The electro-optic response is strongly dominated by
the ionic contribution of transverse optic modes, yielding sizable Pockels coe cients
around 9 pm/V along the polar direction.
Scopus citations®
without self-citations
42