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

被引：14

作者：

Yun, B. K. ^{[1
]}

Koo, Y. S. ^{[1
]}

Jung, J. H. ^{[1
]}

Song, M. ^{[2
,3
]}

Yoon, S. ^{[2
,3
]}

机构：

[1] Inha Univ, Dept Phys, Inchon 402751, South Korea

[2] Ewha Womans Univ, Div Neurosci, Seoul 120750, South Korea

[3] Ewha Womans Univ, Dept Phys, Seoul 120750, South Korea

来源：

PHYSICA B-CONDENSED MATTER | 2010年 / 405卷 / 23期

关键词：

KNbO3 and KTaO3 nanocrystals; Hydrothermal method; Phonons; Phase transitions; HYDROTHERMAL SYNTHESIS; SUPERCRITICAL WATER; POTASSIUM NIOBATE; NANOSTRUCTURES; NANOWIRES; TEMPERATURE; PARTICLES; GROWTH; FERROELECTRICITY; SCATTERING;

D O I：

10.1016/j.physb.2010.09.022

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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.

引用

页码：4866 / 4870

页数：5

共 28 条

[21] Size dependence of nanostructures: Impact of bond order deficiency [J].