Downward self-polarization of lead-free (K<sub>0.5sub>Na<sub>0.5sub>)(Mn<sub>0.005sub>Nb<sub>0.995sub>)O<sub>3sub> ferroelectric thin films on Nb:SrTiO<sub>3sub> substrate
刊名:physica status solidi (RRL) - Rapid Research Letters
出版年:2017
出版时间:January 2017
年:2017
卷:11
期:1
全文大小:406K
ISSN:1862-6270
文摘
Spontaneously appearing macroscopic polarization (self-polarization) in ferroelectrics without an electrode or an external electric field would enable the freedom to design many ferroelectric heterostructures and devices. The (K<sub>0.5sub>Na<sub>0.5sub>)(Mn<sub>0.005sub>Nb<sub>0.995sub>)O<sub>3sub> (KNMN) thin film was grown on Nb:SrTiO<sub>3sub> single-crystal substrate and the resultant self-polarization behavior due to strain relaxation was investigated. The lattice mismatch and difference in TEC between the KNMN thin film and the Nb:SrTiO<sub>3sub> substrate creates a compressive strain. The compressive strain gradient may be the main cause for the observed downward self-polarization. The downward self-polarization of the KNMN thin film can be explained by the strong inhomogeneous compressive strain caused by strain relaxation. (