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http://hdl.handle.net/10773/20683
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Baghizadeh, A. | pt |
dc.contributor.author | Vieira, J. M. | pt |
dc.contributor.author | Amaral, J. S. | pt |
dc.contributor.author | Graca, M. P. | pt |
dc.contributor.author | Soares, M. R. | pt |
dc.contributor.author | Mota, D. A. | pt |
dc.contributor.author | Amaral, V. S. | pt |
dc.date.accessioned | 2017-12-07T19:55:46Z | - |
dc.date.issued | 2015 | pt |
dc.identifier.issn | 0304-8853 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20683 | - |
dc.description.abstract | Lattice constants, magnetic properties and dielectric behavior of h-LuMnxO3 +/-delta solid solution (0.95 <= x <= 1.04) of bulk ceramic samples prepared by the solid state reaction method were studied to determine the role of stoichiometry changes on the crystalline structure and magneto-electric coupling. It is found that increasing of Mn content results in reduction of cell volume of h-LuMnxO3 +/-delta ceramics mostly due to shrinkage of a-axis length. The antiferromagnetic interactions of Mn3+ ions weaken with cell volume contraction. A weak ferromagnetic contribution appeared in all samples and extends up to the Neel temperature, T-N. Irreversibility in temperature dependent magnetic measurements already reported for stoichiometric compositions of hexagonal RMnO3 oxides appears for all h-LuMnxO3 +/-delta samples right below Neel ordering transition. An increase of magnetic coercive field and magnetization on cooling below T-N in samples is observed in field dependent magnetization and rises as x increases. In addition to the antiferromagnetic ordering transition at T-N, two anomalies of the temperature dependent magnetic susceptibility and dielectric constant are identified below T-N, centered at 69 K and 31 K respectively, being probably due to inhomogeneity of the crystalline structure inside ceramic grains. Changes of the dielectric constant at T-N can be attributed to magneto-electric coupling in the off-stoichiometric hexagonal LuMnxO3+delta lattice. The behavior of the dielectric relaxation follows a thermally activated mechanism with activation energy values characteristic of polaron hoping. (C) 2015 Elsevier B.V. All rights reserved | pt |
dc.language.iso | eng | pt |
dc.publisher | ELSEVIER SCIENCE BV | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/105416/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147332/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | HEXAGONAL MANGANITES | pt |
dc.subject | YMNO3 | pt |
dc.subject | LUMNO3 | pt |
dc.subject | YTTRIUM | pt |
dc.subject | SCMNO3 | pt |
dc.subject | PHASE | pt |
dc.subject | AIR | pt |
dc.title | Crystal structure, magnetic and dielectric behavior of h-LuMnxO3 +/-delta ceramics (0.95 <= x <= 1.04) | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 303 | pt |
degois.publication.lastPage | 311 | pt |
degois.publication.title | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | pt |
degois.publication.volume | 395 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.jmmm.2015.07.082 | pt |
dc.identifier.doi | 10.1016/j.jmmm.2015.07.082 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Crystal structure magnetic and dielectric behavior of h-LuMnxO3 +-delta ceramics (0.95 = x = 1.04)_10.1016j.jmmm.2015.07.082.pdf | 2.43 MB | Adobe PDF |
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