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Effect of hydroxyl group on global and local structures of hydrothermally grown KNbO3 nanorods

Title
Effect of hydroxyl group on global and local structures of hydrothermally grown KNbO3 nanorods
Authors
Yun B.K.Koo Y.S.Jung J.H.Song M.Yoon S.
Ewha Authors
윤석현
SCOPUS Author ID
윤석현scopus
Issue Date
2011
Journal Title
Materials Chemistry and Physics
ISSN
0254-0584JCR Link
Citation
Materials Chemistry and Physics vol. 129, no. 3, pp. 1071 - 1074
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We report the annealing temperature dependence of global and local structures of hydrothermally grown KNbO3 nanorods. With increasing annealing temperature, the amount of hydroxyl groups in the KNbO3 nanorods decreased and finally disappeared at about 800 °C. Morphology of the nanorods seemed not to change significantly, however, X-ray intensity ratio between (0 2 2) and (2 0 0) planes, i.e., I0 2 2/I2 0 0, increased with decreasing lattice hydroxyl group contents. This result could be attributed to the fact that the hydroxyl groups were desorbed more effectively along the [0 1 1] direction than in other directions due to the elongated nanorod along the [0 1 1] direction. The frequencies of external and bending modes, besides stretching mode, showed red-shift with decreasing lattice hydroxyl group contents. This result implied that the lattice hydroxyl groups existed as interstitial defects near K ions. © 2011 Elsevier B.V. All rights reserved.
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DOI
10.1016/j.matchemphys.2011.05.059
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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