Low-temperature synthesis of KTa0.55Nb0.45O3 powders and thin films via metal-organic solution

Abstract

Potassium tantalite niobate powders and thin films were synthesized via metal-organic solution. The synthesized powders and thin films have a tetragonal phase with the perovskite structure. The powders show a cubic shape with sizes in the range of 120–230 nm. The emission spectrum of powders shows emissions peaked at 413, 451 and 468 nm, related to the electron-hole recombination of localized exciton Ta4+–O1− and Nb4+–O1− in a regular octahedron (TaO6 and NbO6). The polarization-electric field hysteresis loop of thin films is rectangular. The current–voltage characteristic of thin films shows a feature of linear to nonlinear transition, which is related to the space-charge-controlled mode of electrical conduction in solids.