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

B. K. Yun; Y. S. Koo; J. H. Jung; M. Song; S. Yoon

doi:10.1016/j.physb.2010.09.022

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

B. K. Yun, Y. S. Koo, J. H. Jung, M. Song, S. Yoon

Department of Physics

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

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.

Original language	English
Pages (from-to)	4866-4870
Number of pages	5
Journal	Physica B: Condensed Matter
Volume	405
Issue number	23
DOIs	https://doi.org/10.1016/j.physb.2010.09.022
State	Published - 1 Dec 2010

Keywords

Hydrothermal method
KNbO and KTaO nanocrystals
Phase transitions
Phonons

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10.1016/j.physb.2010.09.022

Cite this

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title = "Possible role of hydroxyl group on local structure and phase transition of KNbO3 and KTaO3 nanocrystals",

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.",

keywords = "Hydrothermal method, KNbO and KTaO nanocrystals, Phase transitions, Phonons",

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T1 - Possible role of hydroxyl group on local structure and phase transition of KNbO3 and KTaO3 nanocrystals

AU - Yun, B. K.

AU - Koo, Y. S.

AU - Jung, J. H.

AU - Song, M.

AU - Yoon, S.

PY - 2010/12/1

Y1 - 2010/12/1

N2 - 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.

AB - 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.

KW - Hydrothermal method

KW - KNbO and KTaO nanocrystals

KW - Phase transitions

KW - Phonons

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