Propriedades estruturais e microestruturais de manganitas dopadas com cobre

Propriedades estruturais e microestruturais de manganitas dopadas com cobre

We report a structural study on polycrystalline La0.86Sr0.14Mn1-y Cu yO3+delta samples (y = 0, 0.05, 0.10, 0.15, 0.20) using refinement of powder X-ray diffraction data and analysis of scanning electron microscopy images. It is found that the structure remains rhombohedral through the whole series, with a decrease in the average Mn-Mn bond distances, slight variations in Mn-O-Mn angle and reduction in the unit cell volume with increasing Cu amounts. The values of Mn-Mn distances suggest compact structures with d within ±1%. Scanning electron microscopy images reveal homogeneous microstructure in all samples, besides a trend for smaller grains and larger porosity with increasing Cu content.

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Main Authors: Victor,Rodolfo Araujo, Orlando,Marcos Tadeu D'Azeredo, Freitas,Jair C. C.
Format: Digital revista
Language:Portuguese
Published: Sociedade Brasileira de Química 2007
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000700004
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spelling oai:scielo:S0100-404220070007000042007-12-11Propriedades estruturais e microestruturais de manganitas dopadas com cobreVictor,Rodolfo AraujoOrlando,Marcos Tadeu D'AzeredoFreitas,Jair C. C. manganites X-ray diffraction scanning electron microscopy We report a structural study on polycrystalline La0.86Sr0.14Mn1-y Cu yO3+delta samples (y = 0, 0.05, 0.10, 0.15, 0.20) using refinement of powder X-ray diffraction data and analysis of scanning electron microscopy images. It is found that the structure remains rhombohedral through the whole series, with a decrease in the average Mn-Mn bond distances, slight variations in Mn-O-Mn angle and reduction in the unit cell volume with increasing Cu amounts. The values of Mn-Mn distances suggest compact structures with d within ±1%. Scanning electron microscopy images reveal homogeneous microstructure in all samples, besides a trend for smaller grains and larger porosity with increasing Cu content.info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaQuímica Nova v.30 n.7 20072007-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000700004pt10.1590/S0100-40422007000700004
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language Portuguese
format Digital
author Victor,Rodolfo Araujo
Orlando,Marcos Tadeu D'Azeredo
Freitas,Jair C. C.
spellingShingle Victor,Rodolfo Araujo
Orlando,Marcos Tadeu D'Azeredo
Freitas,Jair C. C.
Propriedades estruturais e microestruturais de manganitas dopadas com cobre
author_facet Victor,Rodolfo Araujo
Orlando,Marcos Tadeu D'Azeredo
Freitas,Jair C. C.
author_sort Victor,Rodolfo Araujo
title Propriedades estruturais e microestruturais de manganitas dopadas com cobre
title_short Propriedades estruturais e microestruturais de manganitas dopadas com cobre
title_full Propriedades estruturais e microestruturais de manganitas dopadas com cobre
title_fullStr Propriedades estruturais e microestruturais de manganitas dopadas com cobre
title_full_unstemmed Propriedades estruturais e microestruturais de manganitas dopadas com cobre
title_sort propriedades estruturais e microestruturais de manganitas dopadas com cobre
description We report a structural study on polycrystalline La0.86Sr0.14Mn1-y Cu yO3+delta samples (y = 0, 0.05, 0.10, 0.15, 0.20) using refinement of powder X-ray diffraction data and analysis of scanning electron microscopy images. It is found that the structure remains rhombohedral through the whole series, with a decrease in the average Mn-Mn bond distances, slight variations in Mn-O-Mn angle and reduction in the unit cell volume with increasing Cu amounts. The values of Mn-Mn distances suggest compact structures with d within ±1%. Scanning electron microscopy images reveal homogeneous microstructure in all samples, besides a trend for smaller grains and larger porosity with increasing Cu content.
publisher Sociedade Brasileira de Química
publishDate 2007
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000700004
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AT orlandomarcostadeudazeredo propriedadesestruturaisemicroestruturaisdemanganitasdopadascomcobre
AT freitasjaircc propriedadesestruturaisemicroestruturaisdemanganitasdopadascomcobre
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