The effect of refluxing on the alkoxide-based sodium potassium niobate sol-gel system: Thermal and spectroscopic studies

被引：22

作者：

Chowdhury, Anirban ^{[1
]}

Bould, Jonathan ^{[1
,2
]}

Londesborough, Michael G. S. ^{[2
]}

Milne, Steven J. ^{[1
]}

机构：

[1] Univ Leeds, Inst Mat Res, Leeds LS2 9JT, W Yorkshire, England

[2] Acad Sci Czech Republ, Inst Inorgan Chem, CZ-25068 Rez, Czech Republic

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2011年 / 184卷 / 02期

关键词：

Sol-gel processes; Spectroscopy; Thermal properties; X-ray diffraction (XRD); THIN-FILMS; NA0.5K0.5NBO3; CARBONATE; CATALYSTS; POWDERS; CO;

D O I：

10.1016/j.jssc.2010.12.002

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A study on the effects of prolonged heating under reflux conditions of up to 70 h on alkoxides of sodium, potassium and niobium dissolved in 2-methoxyethanol for the synthesis of sols of composition Na0.5K0.5NbO3(NKN) has been carried out using combined thermogravimetric-Fourier transform infrared Spectroscopic analyses. Extended refluxing increases the homogeneity of the Na0.5K0.5NbO3 (NKN) system. Spectroscopic analyses on the non-refluxed and 70 h refluxed NKN gels reveal the existence of inorganic hydrated carbonates and bicarbonates, which we propose arise from the hydration and carbonation of the samples on standing in air. The X-ray diffraction patterns of these two types of gels show orthorhombic NKN phase evolutions at higher temperatures. Crown Copyright (C) 2010 Published by Elsevier Inc. All rights reserved.

引用

页码：317 / 324

页数：8

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