Results 1 to 10 of about 80 (75)

Síntese de pós de LaMnO3 e LaCrO3 dopados com Sr pelo método de combustão: caracterização estrutural e avaliação termodinâmica Synthesis of Sr-doped LaMnO3 and LaCrO3 powders by combustion method: structural characterization and thermodynamic evaluation

Cerâmica, 2012
Manganita de lantânio dopada com estrôncio (LSM) e cromita (LSC) em pó, bem como as correspondentes amostras não dopadas, foram sintetizadas pelo método de combustão, usando dois diferentes combustíveis (ureia e glicina).
A. L. A. da Silva, L. da Conceição, A. M. Rocco, M. M. V. M. Souza   +3 more
doaj  

Estructura cristalina y propiedades de la solución sólida YCo_XMn_1-XO₃

Boletín de la Sociedad Española de Cerámica y Vidrio, 2002
Solid solutions corresponding to the YCoXMn1-XO3 system, x=0.2...0.7 have been studied. The powders were prepared by solid state reaction of the corresponding oxides. Sintered bodies were obtained by firing between 1250 and 1350ºC.
Moure, C., Fernández, J. F., Pena, O., Gutiérrez, D.   +3 more
doaj  

A note on the different crystalline features of the EuMnO₃-based solid solutions as a function of the modifying cation nature

Boletín de la Sociedad Española de Cerámica y Vidrio, 2010
The structural properties of solid solutions based on EuMnO3, in which Eu has been substituted by divalent Ca2+ and Mn by the divalent cation Ni2+ or the variable valence cation Co2+-Co3+ have been studied by X-ray diffraction (XRD) and X-ray absorption ...
Peña, O., Tartaj, J., Moure, A., Moure, C.   +3 more
doaj  

Optimiranje priprave kalcijevog manganita

, 2017
In this work the synthesis of calcium manganite was optimised through a number of different methods of synthesis: mechanochemical, manual homogenisation, Pechini and modified Pechini method. To achieve crystalline calcium manganite synthesised samples were annealed on temperatures from 400 °C to 1200 °C.
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Magnetic behavior of solid solutions REMe_0.50Mn_0.50O₃ (RE = Y, La, Pr, Nd, Eu, Gd, Er ; Me = Ni,Co)

Boletín de la Sociedad Española de Cerámica y Vidrio, 2008
Partial substitution of Mn by a divalent metal in rare-earth manganites REMexMn1 xO3 results in the simultaneous presence of Mn3+ and Mn4+. The RE sublattice has its own properties and can interact with the local field imposed by the ferromagnetic Mn ...
Tartaj, J., Gil, V., Barahona, P., Peña, O., Moure, C.   +4 more
doaj  

Mn-substituted perovskites RECo_xMn_1-xO₃: a comparison between magnetic properties of LaCo_xMn_1-xO₃ and GdCo_xMn_1-xO₃

Boletín de la Sociedad Española de Cerámica y Vidrio, 2008
Cooperative phenomena constitute important mechanisms to explain the magnetic properties of the perovskite manganites REMnO3, in which the rare-earth and/or Mn is partially replaced by divalent elements. In this way, the manganese ion changes its valence
Barahona, P., Gil, V., Moure, C., Pecchi, G., Campos, C., Peña, O.   +5 more
doaj  

Fases nanoscópicas de manganitas magnéticas

, 2014
Pós-graduação em Ciência e Tecnologia de Materiais ...
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Hemijska i mehanohemijska sinteza multiferoika na bazi itrijum-manganita [PDF]

, 2016
U okviru ove doktorske disertacije ispitivan je uticaj parametara mehanohemijske i hemijske sinteze na strukturu i svojstva prahova i keramičkih uzoraka itrijum- -manganita (YMnO3, YMO). Smeša prahova Y2O3 i Mn2O3 mlevena je u planetarnom mlinu tokom vremenskih perioda od 60 – 720 min.
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Obtención de la manganitas de calcio y terbio mediante el método de coprecipitación química

Tópicos de Investigación en Ciencias de la Tierra y Materiales, 2014
En este trabajo se presenta la síntesis y caracterización de la manganita de calcio y terbio (TbxCa1- xMnO3) a diferentes concentraciones del valor de x (0.35, 0.40 y 0.45) mediante el método de síntesis llamado coprecipitación química. Las manganitas fueron obtenidas partiendo de sales precursoras de Ca(NO3)2.4H2O, Mn(NO3)2.H2O y Tb(NO3)3.5H2O ...
Dieuvins Valentin, Leticia E. Hernández Cruz, Herlinda Montiel Sanchez, Felipe Legorreta García   +3 more
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Magnetoresistencia tunel en junturas con manganitas tunneling

, 2010
Este artículo revisa la magnetoresistencia túnel (MRT) de junturas magnéticas, particularmente de aquellas construidas usando manganitas. Son presentados el origen de este tipo de tunelamiento y su dependencia con el material, el método de crecimiento de la juntura y la temperatura.
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