Effects of thickness on structures and electrical properties of Mn-doped K0.5Na0.5NbO3 films

• Published in: Journal of alloys and compounds Vol. 582; pp. 759 - 763
• Main Authors: Wang, Lingyan, Ren, Wei, Shi, Peng, Wu, Xiaoqing, Yao, Xi
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 2014; Elsevier
• Subjects: Coercive electric-field; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Deposition; Dielectric constant; Dielectric properties of solids and liquids; Dielectric thin films; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Ferroelectric materials; Ferroelectricity; Ferroelectricity and antiferroelectricity; Manganese; Mn-doped KNN films; Permittivity (dielectric function); Physics; Remnant polarization; Silicon substrates; Surface layer; Texture; Thickness dependence; Remnant polarization; Coercive electric-field; Dielectric constant; Mn-doped KNN films; Thickness dependence; Potassium Sodium Niobates Mixed; Chemical bath deposition; Manganese additions; Perovskites; Leakage currents; Texture; Thin films; Thickness; Ferroelectricity; Electric field effects; Coercive force; Lead free ceramics; Microstructure; Permittivity
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.08.094

•Structures of K0.5Na0.5NbO3 (KNN) films hardly change with the thickness.•The dielectric constants of films did not monotonously increase with the thickness.•The ferroelectric properties of films improved by increasing the thickness. Lead-free ferroelectric Mn-doped K0.5Na0.5NbO3 (KNN) films with different thicknesses were deposited on Pt(111)Ti/SiO2/Si (100) substrates by a modified chemical solution deposition method. Single perovskite phase with (100)-texture was obtained in all films, whereas with the increase in thickness, the texture and morphologies were not dramatically changed. Dielectric and ferroelectric properties of KNN films were analyzed as a function of the thickness. It is found that the intrinsic and extrinsic contributions to the dielectric constant of KNN films are both increased. However, the dielectric constant of KNN films did not monotonously increase with the thickness increased. Eliminated the effect of leakage current of KNN film with the thickness of 0.65μm, the coercive electric fields lowered and the remnant polarization of KNN films improved with increasing the thickness, indicating the improved ferroelectric properties of KNN films by increasing the thickness.