UNSPECIFIED (2004) Production of rare-earth orthoferrite ceramic fibres by aqueous sol-gel blow spinning process. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 24 (1). pp. 111-117. ISSN 0955-2219

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Abstract

Rare-earth orthoferrite, LnFeO(3) (Ln = La, Sin, Gd, Dy, Er and Yb) ceramic fibres were produced by aqueous sol-gel blow spinning process at low-temperatures. Stable, charge stabilised, colloidal precursor sols of orthoferrites were prepared by room temperature processing of inexpensive and commercially available metal salts. The average diameter (Z(av)) of the colloidal sol particles was in the range 4-7 nm and had a narrow size distribution. The sols were concentrated, combined with spinning aids, and processed further to a viscous 'spinning solution'. The gel fibres of about 6 pm diameter were blow spun, collected as random fibres, dried and heated to increasingly higher temperatures at a rate of 50 degreesC/h. The gel fibres converted to flexible ceramic fibres, and single-phase perovskite structure crystallised directly for all the LnFeO(3) (Ln = La, Sm, Gd, Dy, Er and Yb) fibres on heating them to 700 degreesC. The ceramic fibres had mean diameter of about 3-4 mum, and consisted of randomly oriented submicron sized grains. (C) 2003 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology
Journal or Publication Title:	JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Publisher:	ELSEVIER SCI LTD
ISSN:	0955-2219
Date:	2004
Volume:	24
Number:	1
Number of Pages:	7
Page Range:	pp. 111-117
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9206

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