Thermal stability of (KxNayH1–x–y)2Ti6O13 nanofibers

Cortie, Michael B. and Xiao, Linda and Erdei, Laszlo and Kealley, Catherine S. and Dowd, Annette R. and Kimpton, Justin A. and McDonagh, Andrew M. (2011) Thermal stability of (KxNayH1–x–y)2Ti6O13 nanofibers. European Journal of Inorganic Chemistry (33). pp. 5087-5095. ISSN 1434-1948

Official URL: http://www.eurjic.org

Abstract

Potassium-rich titanate nanofibers were produced by digesting TiO2 in concentrated KOH solutions under hydrothermal conditions. The nanofibers were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and thermogravimetric analysis. A hexa-titanate structure was assigned, in contrast to the tri-titanate structure usually resulting from NaOH treatment of TiO2. The potassium cations could be exchanged with others, such as sodium, hydrogen and ammonium. The potassium-rich hexa-titanate was found to be photocatalytic in the as-synthesized condition. The thermal stability of the fibers during calcination was followed in situ using X-ray diffraction and was found to be strongly dependent on the chemical composition. The potassium-rich titanate converted to anatase at only 480 °C while the hydrogen-rich and ammonium-rich materials had to be heated to over 600 °C before conversion took place. Conversion was notably slowest in the ammonium-rich material. Surprisingly, the sodium-rich hexa-titanate did not form anatase at temperatures up to 800 °C, and instead recrystallized.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: Dr Laszlo Erdei
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 17 Feb 2012 07:49
Last Modified: 26 Aug 2014 22:18
Uncontrolled Keywords: nanostructures; nanofibres; layered compounds; high-temperature chemistry; titanates; solid-state reactions
Fields of Research (FOR2008): 03 Chemical Sciences > 0302 Inorganic Chemistry > 030206 Solid State Chemistry
10 Technology > 1007 Nanotechnology > 100708 Nanomaterials
10 Technology > 1007 Nanotechnology > 100706 Nanofabrication, Growth and Self Assembly
Socio-Economic Objective (SEO2008): B Economic Development > 86 Manufacturing > 8610 Ceramics, Glass and Industrial Mineral Products > 861099 Ceramics, Glass and Industrial Mineral Products not elsewhere classified
Identification Number or DOI: doi: 10.1002/ejic.201100651
URI: http://eprints.usq.edu.au/id/eprint/20632

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