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Possible role of hydroxyl group on local structure and phase transition of KNbO3 and KTaO3 nanocrystals

Title
Possible role of hydroxyl group on local structure and phase transition of KNbO3 and KTaO3 nanocrystals
Authors
Yun B.K.Koo Y.S.Jung J.H.Song M.Yoon S.
Ewha Authors
윤석현
SCOPUS Author ID
윤석현scopus
Issue Date
2010
Journal Title
Physica B: Condensed Matter
ISSN
0921-4526JCR Link
Citation
vol. 405, no. 23, pp. 4866 - 4870
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We investigate the structural and phase transition characteristics of hydrothermally grown KNbO3 and KTaO3 nanocrystals. Field emission scanning electron microscope and transmission electron microscope measurements clearly show that the KNbO3 crystal has a nanorod shape while the KTaO3 crystal has a nanocube shape. Fourier transform infrared spectroscopy measurement reveals the existence of a hydroxyl group in both nanocrystals. The hydroxyl group seems to be related to the enlarged lattice constants, the lowered structural phase transition temperatures, the broad phonon width and the increased number of Raman-active phonon modes in KNbO3 and KTaO3 nanocrystals. © 2010 Elsevier B.V. All rights reserved.
DOI
10.1016/j.physb.2010.09.022
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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