Hydrothermal synthesis of epitaxial NaxK(1-x)NbO3 solid solution films

作者：Handoko Albertus D; Goh Gregory K L^*

来源：Thin Solid Films, 2011, 519(15): 5156-5160.

DOI：10.1016/j.tsf.2011.01.078

• Lead free
• Biezoelectrics
• Hydrothermal
• Solution growth
• Epitaxy
• Sodium potassium niobate

NaxK1-xNbO3-based solid solutions are one of the leading lead-free piezoelectric materials that exhibit comparable piezoelectric properties to actuator grade lead-zirconium-titanate (PZT). Here we report the growth of single phase, epitaxial NaxK1-xNbO3 (NKN) films hydrothermally grown over single crystal Nb: SrTiO3 substrates in a simple KOH and NaOH mixture with Nb2O5 as a precursor powder. The epitaxial NKN film remains single phase up to 13.3% NaOH relative concentration (compared to the total hydroxyl ion), above which a second layer of Na-rich NKN phase grows on top of the original NKN layer. It is discovered that by controlling the reaction time and applying mild post-growth treatment, the unwanted Na-rich phase growth can be suppressed, therefore enabling epitaxial growth of single phase NKN at compositions closer to the morphotropic phase boundary.

• 出版日期2011-5-31
• 单位南阳理工学院