Examination of selectivity of templates for the textured potassium sodium niobate ceramics

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Vol. 22; no. 3; pp. 383 - 389
• Main Authors: Choi, Si-Young, Jeon, Jae-Ho
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2011
• Subjects: Barium titanates; Ceramics; Coherence; Corrosion resistance; Crystallography; Lead-free materials; Perovskite; Piezoelectricity; Potassium niobates; Powder technology; Strontium titanates; Template grain growth; Template grain growth; Piezoelectricity; Perovskite; Lead-free materials
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2010.06.002

To achieve the surface-orientation-controlled microstructure of K 0.5Na 0.5NbO 3, not only the template must exhibit the high anisotropy like a plate-shape but the reactive stability as well as the crystallographic coherency between the template and the K 0.5Na 0.5NbO 3 must be carefully considered. In this work, we focused on what kinds of ceramics are suitable for the fabrication of the surface-orientation-controlled K 0.5Na 0.5NbO 3. First of all, BaTiO 3, SrTiO 3, Ba(Zr 0.1Ti 0.9)O 3, KNbO 3, NaNbO 3, KTaO 3 and NaTaO 3 were chosen as the candidates in the regard of the crystallographic coherency. To verify the chemical stability between candidate ceramics and K 0.5Na 0.5NbO 3, the prepared candidate ceramic bulks were embedded by the K 0.5Na 0.5NbO 3 powder, they were annealed at 1100 °C, and then the interface regions between candidate ceramics and K 0.5Na 0.5NbO 3 were investigated using Secondary Electron Microscopy (SEM) equipped with Energy Dispersive Spectrometer (EDS). From these experimental results, BaTiO 3, SrTiO 3, Ba(Zr 0.1Ti 0.9)O 3, KNbO 3 and NaTaO 3 were found to be not appropriate for the templates for the tailoring of K 0.5Na 0.5NbO 3, while the NaNbO 3 and KTaO 3 showed a good crystallographic coherency and a chemical stability with K 0.5Na 0.5NbO 3.