Title :
The effect of template morphologies on microstructure and properties of textured K0.5Na0.5NbO3 ceramics by RTGG method
Author :
Cao, Minghe ; Li, Fan ; Lv, Mengpu ; Hao, Hua ; Yu, Zhiyong ; Yao, Zhonghua ; Liu, Hanxing
Author_Institution :
State Key Lab. of Adv. Technol. for Mater. Synthesis & Process., WHUT, Wuhan, China
Abstract :
Lead free textured K0.5Na0.5NbO3 piezoelectric ceramics have been prepared by reactive-templated grain growth method by using NaNbO3 with different morphologies as templates. The NaNbO3 template particles with different edge length (10-20 μm) and thickness (0.5-2.5 μm) was synthesized through controlling Bi1.5Nax-1.5NbxO3x+3 precursor´s layer numbers x from 2 to 6 by two-step molten salt methods. The crystalline phases and microstructure of textured K0.5Na0.5NbO3 were characterized by X-ray diffraction and scanning electron microscopy, respectively. It shows that all the K0.5Na0.5NbO3 ceramics are orthorhombic perovskite structure with {0 0 1} orientation. By using the template particles with a ratio of edge length to thickness (l/h) =~10, the textured ceramics with optimized piezoelectric properties was prepared. The results indicate that the enhanced properties of textured ceramics are concerned with the template morphology.
Keywords :
X-ray diffraction; crystal microstructure; grain growth; piezoceramics; potassium compounds; scanning electron microscopy; sodium compounds; texture; K0.5Na0.5NbO3; RTGG method; SEM; X-ray diffraction; XRD; crystalline phases; edge length; lead free textured piezoelectric ceramics; microstructure; optimized piezoelectric properties; orthorhombic perovskite structure; precursor layer numbers; reactive-templated grain growth method; scanning electron microscopy; size 0.5 mum to 2.5 mum; size 10 mum to 20 mum; sodium niobate template particles; template morphologies; two-step molten salt methods; {001} orientation; Ceramics; Lead; Morphology; System-on-a-chip; Temperature dependence; Temperature measurement; X-ray diffraction; K0.5Na0.5NbO3 ceramics; RTGG; Template morphology; Textured ceramics;
Conference_Titel :
Applications of Ferroelectrics (ISAF/PFM), 2011 International Symposium on and 2011 International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4577-1162-6
Electronic_ISBN :
978-1-4577-1161-9
DOI :
10.1109/ISAF.2011.6014142
