Synthesis of homogeneous (Na1-xKx)NbO3 nanorods using hydrothermal and post-heat treatment processes

Title
Synthesis of homogeneous (Na1-xKx)NbO3 nanorods using hydrothermal and post-heat treatment processes
Authors
HaiBo XuMi-Ri JoungJin-Seong KimSahn Nahm강민규강종윤윤석진
Keywords
Piezoelectric nanogenerator; (Na8xK8-8x)Nb6O19ㆍnH2O phase; Lead-free piezoelectric materials; Hydrothermal processes
Issue Date
2012-11
Publisher
Chemical engineering journal
Citation
VOL 211-212, 16-21
Abstract
To synthesize (Na1&#8722;xKx)NbO3 nanorods, the Nb2O5-added (1 &#8722; y)NaOH&#8211;yKOH specimens with 0.0 ≤ y ≤ 0.9 were heated at 160 °C and subsequently annealed at 500 °C. Homogeneous Na-rich (Na1&#8722;xKx)NbO3 nanorods were only synthesized for the specimen with y = 0.15. However, NaNbO3 nanorods were formed for specimens with y < 0.15, and K-rich (Na1&#8722;xKx)NbO3 nanoplates were obtained for specimens with y > 0.2. The (Na8xK8&#8722;8x)Nb6O19&#8901;nH2O transient phase was formed in the specimen with y = 0.15 heated at 160 °C for 8.0&#8211;12.0 h, and this phase transformed into the Na-rich (Na1&#8722;xKx)NbO3 nanorods after annealing at 500 °C. Therefore, the formation of a homogeneous (Na8xK8&#8722;8x)Nb6O19&#8901;nH2O phase at a low temperature is very important for the synthesis of the (Na1&#8722;xKx)NbO3 nanorods. The (Na8xK8&#8722;8x)Nb6O19&#8901;nH2O phase was considerably influenced by the heating temperature, and the processing time. The Na-rich (Na1&#8722;xKx)NbO3 nanorods have rectangular shape with various sizes, and the growth direction of these nanorods is [0 0 1].
URI
http://pubs.kist.re.kr/handle/201004/44343
ISSN
13858947
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