Synthesis, growth mechanism and optical properties of (K,Na)NbO3 nanostructures

Zhao Wang; Haoshuang Gu; Yongming Hu; Kun Yang; Mingzhe Hu; Di Zhou; Jianguo Guan

doi:10.1039/C000169D

Synthesis, growth mechanism and optical properties of (K,Na)NbO₃nanostructures

Zhao Wang,^a Haoshuang Gu,*^a Yongming Hu,^a Kun Yang,^a Mingzhe Hu,^a Di Zhou^a and Jianguo Guan*^b

* Corresponding authors

^a Faculty of Physics and Electronic technology, State Key Laboratory of Ferro- & Piezoelectric Materials and Device of Hubei Province, Hubei University, Wuhan, Hubei, P.R. China
E-mail: guhsh583@yahoo.com.cn

^b State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei, P.R. China
E-mail: guanjg@whut.edu.cn

Abstract

(K_1−xNa_x)NbO₃ (KNN) nanomaterials with various morphologies, including nanorods, step-like structures etc. were synthesized through a hydrothermal route. For KNN nanomaterials, the phase structures changed from orthorhombic to monoclinic as the x value increased from 0.27 to 0.66. Oriented attachment and aggregation are the major formation mechanism of the nanorods and the step-like structures, respectively. The compositional change in KNN induced a series of shifts of the Raman bands, of which the mechanisms are briefly discussed. A UV/vis absorption study shows that, for K_0.50Na_0.50NbO₃ nanorods, two interband transitions from O_2p electron states to empty Nb_4d electron states and two intraband transitions in relation to Nb⁵⁺ cations are revealed, and the band gap is about 3.09 eV.

Article information

https://doi.org/10.1039/C000169D

Article type

Paper

Submitted

06 Jan 2010

Accepted

16 Apr 2010

First published

15 Jun 2010

Download Citation

CrystEngComm, 2010,12, 3157-3162

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Synthesis, growth mechanism and optical properties of (K,Na)NbO₃ nanostructures

Z. Wang, H. Gu, Y. Hu, K. Yang, M. Hu, D. Zhou and J. Guan, CrystEngComm, 2010, 12, 3157 DOI: 10.1039/C000169D

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