Phase evolution in low-dimensional niobium oxide synthesized by a topochemical method

Lihong Li; Jinxia Deng; Ranbo Yu; Jun Chen; Xiaowei Wang; Xianran Xing

doi:10.1021/ic902165r

Phase evolution in low-dimensional niobium oxide synthesized by a topochemical method

Inorg Chem. 2010 Feb 15;49(4):1397-403. doi: 10.1021/ic902165r.

Authors

Lihong Li¹, Jinxia Deng, Ranbo Yu, Jun Chen, Xiaowei Wang, Xianran Xing

Affiliation

¹ Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.

PMID: 20063895
DOI: 10.1021/ic902165r

Abstract

In this paper, we report a catalyst-free topochemical method, combined with molten salt synthesis (MSS), to synthesize, on a large scale, rodlike and platelet single crystals of Nb(2)O(5). Rodlike KNb(3)O(8) and platelet K(4)Nb(6)O(17), which were fabricated as the precursors by the molten salt method, were treated by proton exchange and heat treatment to synthesize the rodlike H-Nb(2)O(5) and platelet T-Nb(2)O(5) single crystal, respectively. The synthesized niobium pentaoxides retained the rodlike and platelet shapes of their precursors. The structural changes involved in the process were investigated by Raman spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. A possible topochemical reaction mechanism is proposed. Furthermore, rodlike and platelet KNbO(3) powders were derived from stable H-Nb(2)O(5) and T-Nb(2)O(5), respectively.