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Internal friction investigation of phase transformation in nearly stoichiometric LaMnO3+δ

Zenati, R. and Bernard, C. and Calmet, Christophe and Guillemet-Fritsch, Sophie and Fantozzi, Gilbert and Durand, Bernard Internal friction investigation of phase transformation in nearly stoichiometric LaMnO3+δ. (2005) Journal of the European Ceramic Society, vol. 2 (n°6). pp. 935-941. ISSN 0955-2219

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2004.03.015

Abstract

Rhombohedral LaMnO3+δ powders, prepared by two different soft chemistry routes (co-precipitation and hydrothermal synthesis), are sintered at 1400 °C for 2 h in air. Measurements of internal friction Q−1(T) and shear modulus G(T), at low frequencies from −180 to 700 °C under vacuum, evidence three structural transitions of nearly stoichiometric orthorhombic LaMnO3+δ. The first one, at 250 or 290 °C, depending on the processing followed, is associated to either a Jahn–Teller structural transition or a phase transformation from orthorhombic to pseudo-cubic. The second one at 610 or 630 °C is related to a phase transformation from pseudo-cubic or orthorhombic to rhombohedral. Below the Neel temperature, around −170 °C, a relaxation peak could be associated, for samples prepared according to both processing routes, to the motion of Weiss domains.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TX0-4CNJ9K0-B&_user=4373306&_coverDate=03%2F31%2F2005&_alid=795968813&_rdoc=1&_fmt=high&_orig=search&_cdi=5576&_sort=d&_docanchor=&view=c&_ct=1&_acct=C000043979&_version=1&_urlVersion=0&_userid=4373306&md5=a6403f03e50cc0ba0e8811ae506e79be Journal of the European Ceramic Society website : http://www.elsevier.com/wps/find/journaldescription.cws_home/405935/description#description
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Thomas Bonnecarere

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