Effects of Reaction Temperature on Structure and Optical Properties of Hydrothermally Prepared (NH4)xWO3-y and WO3·1/3H2O

doi:10.3724/SP.J.1077.2014.14026

Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (5): 550-556.DOI: 10.3724/SP.J.1077.2014.14026

• Research Letter • Previous Articles Next Articles

Effects of Reaction Temperature on Structure and Optical Properties of Hydrothermally Prepared (NH₄)_xWO_3-y and WO₃·1/3H₂O

WANG Kun¹, KANG Li-Tao¹, CHEN Shi², DONG Li¹, LIANG Wei¹, GAO Feng^1,3

(1. Nano-Energy Inorganic Materials Laboratory, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 3. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030024, China)

Received:2014-01-10 Revised:2014-02-26 Published:2014-05-20 Online:2014-04-24
About author:WANG Kun(1989-), female, candidate of master degree. E-mail: 815569005@qq.com
Supported by:
Postdoctoral Science Foundation of China (2012M520605); Research Foundation of Taiyuan University of Technology (tyut-rc201369a, 2013Z040); Open Foundation of State Key Laboratory of Coal Conversion (09-102); Natural Science Foundation of Shanxi Province (2013011042-1)

Abstract

Abstract: Effects of reaction temperature on phase, microstructure and optical property of hydrothermally prepared (NH₄)_xWO_3-y and WO₃·1/3H₂O were studied in this work. XRD results show that the sample prepared at 100℃ is hexagonal (NH₄)_xWO_3-_y (h-(NH₄)_xWO_3-y). At higher reaction temperatures of 140℃ and 180℃, the hexagonal (NH₄)_xWO_3-y gradually and partially transforms into orthorhombic WO₃·1/3H₂O (o-WO3·1/3H2O). SEM and TEM images illustrate that both (NH₄)_xWO_3-y and WO₃·1/3H₂O crystallites show a short-rod shape with a [001] growth direction (c axis). The phases of crystallites seem to be strongly related to crystallite sizes; nano- and micro-sized crystallites adopt h-(NH₄)_xWO_3-y and o-WO₃·1/3H₂O, respectively. Based on XRD, SEM and TEM results, a mechanism is extracted to explain the transformation from h-(NH₄)_xWO_3-y to o-WO₃·1/3H₂O. Optical measurements indicate that the h-(NH₄)_xWO_3-y nano-rods prepared at 100℃ exhibit a low infrared light transmittance of 25.5%, and maintaining a high luminous transmittance (67.6%), mainly due to the fice crystallite sizes.

Key words: (NH₄)_xWO_3-y, WO₃·1/3H₂O, reaction temperature, NIR shielding ability

CLC Number:

TB321

WANG Kun, KANG Li-Tao, CHEN Shi, DONG Li, LIANG Wei, GAO Feng. Effects of Reaction Temperature on Structure and Optical Properties of Hydrothermally Prepared (NH₄)_xWO_3-y and WO₃·1/3H₂O[J]. Journal of Inorganic Materials, 2014, 29(5): 550-556.

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Effects of Reaction Temperature on Structure and Optical Properties of Hydrothermally Prepared (NH₄)_xWO_3-y and WO₃·1/3H₂O

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