Zobrazeno 1 - 10
of 396
pro vyhledávání: '"Chaves, M. R."'
Autor:
Mota, D. A., Barcelay, Y. Romaguera, Tavares, P. B., Chaves, M. R., Almeida, A., Oliveira, J., Ferreira, W. S., Moreira, J. Agostinho
This work is focused on the phase diagrams and physical properties of Y-doped and Lu-doped EuMnO3. The differences in the corresponding phase boundaries in the (x,T) phase diagram could be overcome by considering a scaling of the Y3+ and Lu3+ concent
Externí odkaz:
http://arxiv.org/abs/1208.2336
Autor:
Moreira, J. Agostinho, Almeida, A., Oliveira, J., Chaves, M. R., Kreisel, J., Carpinteiro, F., Tavares, P. B.
In this work we investigate the magnetic field dependence of Ag octahedra rotation (tilt) and B2g symmetric stretching modes frequency at different temperatures. Our field-dependent Raman investigation at 10K is interpreted by an ionic displacive nat
Externí odkaz:
http://arxiv.org/abs/1111.4854
Autor:
Moreira, J. Agostinho, Almeida, A., Ferreira, W. S., Araújo, J. P., Pereira, A. M., Chaves, M. R., Costa, M. M. R., Khomchenko, V. A., Kreisel, J., Chernyshov, D., Tavares, S. M. F. Vilela And P. B.
This work reports an experimental investigation of the magneto-elastic coupling and polarization character of magnetic phases of the orthorhombic Eu1-xYxMnO3 system at low temperatures. The temperature dependence of the polarization reversal curves c
Externí odkaz:
http://arxiv.org/abs/1005.4841
Autor:
Moreira, J. Agostinho, Almeida, A., Ferreira, W. S., Chaves, M. R., Kundys, B., Ranjith, R., Prellier, W., Vilela, S. M. F., Tavares, P. B.
Eu1-xYxMnO3 exhibits, unlike other magnetoelectric systems, very distinctive features. Its magnetoelectric properties is driven by the magnetic spin of the Mn3+ ion, but they can be drastically changed by varying the content of Y3+, which it does not
Externí odkaz:
http://arxiv.org/abs/0909.4521
Autor:
Moreira, J. Agostinho, Almeida, A., Ferreira, W. S., Chaves, M. R., Vilela, S. M. F., Tavares, P. B.
To clarify the controversy concerning the ferroelectricity of the lower temperature magnetic phases of Eu0.8Y0.2MnO3, hence its multiferroic character, we have studied in detail the temperature dependence of the electric polarization. The existence o
Externí odkaz:
http://arxiv.org/abs/0903.5471
Autor:
Moreira, J. Agostinho, Almeida, A., Ferreira, W. S., Chaves, M. R., Kreisel, J., Vilela, S. M. F., Tavares, P. B.
In this work we present a detailed study of the structural and lattice dynamic properties of Y-doped EuMnO3 ceramics (Eu1-xYxMnO3, with 0
Externí odkaz:
http://arxiv.org/abs/0903.4753
Autor:
Rodrigues V. H., Costa M. M. R., Paixäo J. A., Santos M. L., Agostinho Moreira J., Chaves M. R., Almeida A., Klöpperpieper A.
Publikováno v:
Zeitschrift für Kristallographie - New Crystal Structures, Vol 219, Iss 1-4, Pp 480-482 (2004)
Externí odkaz:
https://doaj.org/article/364b3e46d1524607936d5f32a5034e48
Autor:
Rodrigues V. H., Costa M. M. R., Klöpperpieper A., Chaves M. R., Almeida A., Agostinho Moreira J.
Publikováno v:
Zeitschrift für Kristallographie - New Crystal Structures, Vol 220, Iss 3, Pp 363-364 (2005)
C10H24BrN2NaO5, monoclinic, C121 (no. 5), a = 9.108(2) Å, b = 6.531(1) Å, c = 13.306(2) Å, β = 105.11(2)°, V = 764.2 Å3, Z = 2, Rgt(F) = 0.032, wRref(F2) = 0.092, T = 293 K.
Externí odkaz:
https://doaj.org/article/f899319bb69d4d6199c23c0d14ce1ec8
Autor:
Andrade L. C. R., Costa M. M. R., Paixäo J. A., Agostinho Moreira J., Santos M. L., Chaves M. R., Almeida A.
Publikováno v:
Zeitschrift für Kristallographie - New Crystal Structures, Vol 217, Iss 1, Pp 433-434 (2002)
Externí odkaz:
https://doaj.org/article/8809b7b03caf461e92ceed56a38df4b5
Autor:
Andrade L. C. R., Costa M. M. R., Paixāo J. A., Santos M. L., Agostinho Moreira J., Chaves M. R., Almeida A.
Publikováno v:
Zeitschrift für Kristallographie - New Crystal Structures, Vol 217, Iss 1, Pp 537-538 (2002)
Externí odkaz:
https://doaj.org/article/f289335e9c464b188bdb20f475fc8524