Journal
PHYSICA B-CONDENSED MATTER
Volume 405, Issue 23, Pages 4866-4870Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2010.09.022
Keywords
KNbO3 and KTaO3 nanocrystals; Hydrothermal method; Phonons; Phase transitions
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Funding
- Korean Government (MOEHRD [KRF-2008-313-C00253, 2009-0073752]
- National Research Foundation of Korea [2009-0073752] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 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. (C) 2010 Elsevier B.V. All rights reserved.
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