Fig 1.
Index of refraction (a) and Extinction coefficient (b) of SrTiO3 and DyScO3 substrates.
Fig 2.
Θ-2Θ x-ray diffraction patterns in the KNNO films on (a,b) SrTiO3(001) and (c,d) DyScO3(011) substrates.
Diffractions from the substrates and films are marked by s and f, correspondingly. Panels (b,d) show scans around (002) diffractions.
Fig 3.
Schematic pesentation of (a) tetragonal and (b) pseudo-cubic unit cells in the cube-on-cube-type epitaxial KNNO films on (a) STO and (b) DSO substrates.
Table 1.
Summary of structural and optical properties in ceramics and thin-film KNNO.
Fig 4.
(a) Extinction coefficient k and (b) refractive index n of KNNO films.
Fig 5.
Absorption coefficient α as a function of photon energy E in the KNNO films.
Fig 6.
Tauc plots for (a) indirect and (b) direct optical transitions in the KNNO films.