Origin of microcracking in YMnO3 ceramics
authors Tomczyk, M; Senos, AM; Vilarinho, PM; Reaney, IM
nationality International
journal SCRIPTA MATERIALIA
author keywords YMnO3; Multiferroic; Ceramics; Microcracking
keywords THERMAL-EXPANSION ANISOTROPY; TITANATE-MULLITE COMPOSITES; MANGANITES; BEHAVIOR; GEL
abstract YMnO3 is a multiferroic with a high-temperature ferroelectric phase transition (T-C = 913 K) and a subambient Neel temperature (T-N = 70 K). Ferroelectricity has been reported for single crystals and epitaxial thin films but to date not for ceramics. We postulate that the absence of direct evidence of ferroelectricity in ceramic YMnO3 might be attributed to microcrack formation (3.2 vol.%) on cooling. We show that microcracking originates from a combination of 3.7 vol.% change and strong anisotropy in the thermal expansion coefficient (a) of the hexagonal structure (alpha(a)-alpha(c)vertical bar approximate to 4.57 x 10(-5)degrees C-1) between 600 and 1000 degrees C. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 1359-6462
year published 2012
volume 66
issue 5
beginning page 288
ending page 291
digital object identifier (doi) 10.1016/j.scriptamat.2011.11.014
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000300129200023
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journal impact factor 5.079
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