Crystalline structure and electrical properties of solid solutions YNi<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub>
Solid solutions belonging to the Mn-rich region of the YNiXMn1-XO3 system have been studied. The powders were prepared by solid state reaction between the corresponding oxides. Sintered ceramics were obtained by firing at 1325-1350ºC. The incorporation of 20 atomic % Ni2+ to the Yttrium manganite in...
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doaj-095f96cfd878497a85f55ca5e4f19e632020-11-24T22:55:12ZengElsevierBoletín de la Sociedad Española de Cerámica y Vidrio0366-31751999-12-01386653657Crystalline structure and electrical properties of solid solutions YNi<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub>Moure, C.Durán, P.Fernández, J. F.Gutiérrez, D.Solid solutions belonging to the Mn-rich region of the YNiXMn1-XO3 system have been studied. The powders were prepared by solid state reaction between the corresponding oxides. Sintered ceramics were obtained by firing at 1325-1350ºC. The incorporation of 20 atomic % Ni2+ to the Yttrium manganite induces the formation of a perovskite phase, with orthorhombic symmetry. Increase of the Ni amount leads to an increase of the orthorhombicity factor b/a, up to an amount of 50 atomic % Ni2+. Above this Ni amount, a biphasic system has been observed, with the presence of unreacted Y2O3. DC electrical conductivity measurements have shown semiconducting behaviour for all the solid solutions with perovskite-type structure. The room temperature conductivity increases with Ni until ~33 atomic % Ni, and then decreases. The 50/50 Ni/Mn composition has different values of conductivity and activation energy against those corresponding to samples with lower values of that ionic ratio. Small polaron hopping mechanism controls the conductivity in these ceramics. Results are discussed as a function of the Mn3+/Mn4+ ratio for each composition.<br><br>Se han estudiado las soluciones sólidas correspondientes a la región rica en Mn del sistema YNiXMn1-XO3, entre 0 y 50 atomic % Ni. Los compuestos fueron preparados por reacción en estado sólido de los óxidos correspondientes. Se sinterizaron materiales cerámicos a 1325-1350ºC. Con cantidades de 20 atomic % Ni se produce la formación de una fase con estructura de perovskita, y simetría ortorrómbica. La distorsión ortorrómbica crece con el contenido de Ni. Por encima de 50 atomic % Ni, aparece Y2O3 sin reaccionar. Las soluciones sólidas muestran semiconducción con valores de σ que aumentan con el contenido de Ni hasta ~33 atomic %, para luego decrecer, hasta x=0.5. La composición 50/50 Ni/Mn muestra un comportamiento eléctrico algo diferente. Se discuten los resultados en función de la razón Mn3+/Mn4+ para cada composición.http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/905/942Manganitesperovskite solid solutionselectrical propertiesceramicsManganitasSoluciones sólidaspropiedades eléctricascerámicas |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Moure, C. Durán, P. Fernández, J. F. Gutiérrez, D. |
spellingShingle |
Moure, C. Durán, P. Fernández, J. F. Gutiérrez, D. Crystalline structure and electrical properties of solid solutions YNi<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub> Boletín de la Sociedad Española de Cerámica y Vidrio Manganites perovskite solid solutions electrical properties ceramics Manganitas Soluciones sólidas propiedades eléctricas cerámicas |
author_facet |
Moure, C. Durán, P. Fernández, J. F. Gutiérrez, D. |
author_sort |
Moure, C. |
title |
Crystalline structure and electrical properties of solid solutions YNi<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub> |
title_short |
Crystalline structure and electrical properties of solid solutions YNi<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub> |
title_full |
Crystalline structure and electrical properties of solid solutions YNi<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub> |
title_fullStr |
Crystalline structure and electrical properties of solid solutions YNi<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub> |
title_full_unstemmed |
Crystalline structure and electrical properties of solid solutions YNi<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub> |
title_sort |
crystalline structure and electrical properties of solid solutions yni<sub>x</sub>mn<sub>1-x</sub>o<sub>3</sub> |
publisher |
Elsevier |
series |
Boletín de la Sociedad Española de Cerámica y Vidrio |
issn |
0366-3175 |
publishDate |
1999-12-01 |
description |
Solid solutions belonging to the Mn-rich region of the YNiXMn1-XO3 system have been studied. The powders were prepared by solid state reaction between the corresponding oxides. Sintered ceramics were obtained by firing at 1325-1350ºC. The incorporation of 20 atomic % Ni2+ to the Yttrium manganite induces the formation of a perovskite phase, with orthorhombic symmetry. Increase of the Ni amount leads to an increase of the orthorhombicity factor b/a, up to an amount of 50 atomic % Ni2+. Above this Ni amount, a biphasic system has been observed, with the presence of unreacted Y2O3. DC electrical conductivity measurements have shown semiconducting behaviour for all the solid solutions with perovskite-type structure. The room temperature conductivity increases with Ni until ~33 atomic % Ni, and then decreases. The 50/50 Ni/Mn composition has different values of conductivity and activation energy against those corresponding to samples with lower values of that ionic ratio. Small polaron hopping mechanism controls the conductivity in these ceramics. Results are discussed as a function of the Mn3+/Mn4+ ratio for each composition.<br><br>Se han estudiado las soluciones sólidas correspondientes a la región rica en Mn del sistema YNiXMn1-XO3, entre 0 y 50 atomic % Ni. Los compuestos fueron preparados por reacción en estado sólido de los óxidos correspondientes. Se sinterizaron materiales cerámicos a 1325-1350ºC. Con cantidades de 20 atomic % Ni se produce la formación de una fase con estructura de perovskita, y simetría ortorrómbica. La distorsión ortorrómbica crece con el contenido de Ni. Por encima de 50 atomic % Ni, aparece Y2O3 sin reaccionar. Las soluciones sólidas muestran semiconducción con valores de σ que aumentan con el contenido de Ni hasta ~33 atomic %, para luego decrecer, hasta x=0.5. La composición 50/50 Ni/Mn muestra un comportamiento eléctrico algo diferente. Se discuten los resultados en función de la razón Mn3+/Mn4+ para cada composición. |
topic |
Manganites perovskite solid solutions electrical properties ceramics Manganitas Soluciones sólidas propiedades eléctricas cerámicas |
url |
http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/905/942 |
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