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Autor:
Rezende, Marcos Vinicius dos Santos, Valério, Mario Ernesto Giroldo, Mouta, Rodolpho, Diniz, Eduardo Moraes, Paschoal, Carlos William de Araújo
We investigated the Li+ ion incorporation in Ba2GdNbO6:Eu3+ perovskite by atomistic simulations based on energy minimization. We predicted the most probable sites occupied by Eu3+ and Li+ ions and the related charge-compensation mechanisms involved i
Externí odkaz:
http://arxiv.org/abs/1403.0977
Autor:
Rodrigues, João Elias Figueiredo Soares, Bezerra, Débora Morais, Maciel, Adeilton Pereira, Paschoal, Carlos William de Araujo
In this work we investigated the phase formation and structural ordering of Ba$_{3}$B$^{'}$Nb$_{2}$O$_{9}$ (B$^{'}$ $=$ Ca and Zn) perovskite powders obtained by a modified polymeric precursor route using X-ray powder diffraction and Raman spectrosco
Externí odkaz:
http://arxiv.org/abs/1308.1644
Autor:
Rodrigues, João Elias Figueiredo Soares, Moreira, Edvan, Bezerra, Débora Morais, Maciel, Adeilton Pereira, Paschoal, Carlos William de Araujo
In this work we performed a detailed investigation about ordering in \bcn perovskite. The sintering temperature and time were changed to obtain samples with different ordering. The order parameters were probed by Raman spectroscopy based on a partial
Externí odkaz:
http://arxiv.org/abs/1304.0535
Autor:
Silva, M. D. P., Silva, F. C., Sinfrônio, F. S. M., Paschoal, Alexandre Rocha, Silva, E. N., Paschoal, Carlos William de Araujo
In this work nanometric spinel Co${}_{1-x}$Cu${}_{x}$Fe${}_{2}$O${}_{4}$ powders were obtained by polymeric precursors method at several annealing temperatures between 700 and 1200 ${}^\circ$C. The samples were characterized by means of X-ray powder
Externí odkaz:
http://arxiv.org/abs/1301.7716
Publikováno v:
Appl. Phys. Lett. 102, 192902 (2013)
We performed Raman spectroscopy measurements under temperature changes from 10 K up to 850 K to probe the phonon-spin coupling in Y$_2$NiMnO$_6$. The spin-phonon coupling was observed as a softening of the stretching mode, indicating this phonon stab
Externí odkaz:
http://arxiv.org/abs/1301.6925
Publikováno v:
Case Studies in Construction Materials, Vol 15, Iss , Pp e00645- (2021)
In this study, Young’s moduli (E) of 28-day concrete determined through destructive tests according to NBR 8522−2017 were compared with results of nondestructive tests, such as the ultrasonic pulse velocity (UPV) and impulse excitation technique
Externí odkaz:
https://doaj.org/article/4765f89b9c5a465f9516d01f2d95bad6
Autor:
Rodrigues, João Elias Figueiredo Soares, Bezerra, Débora Morais, Maciel, Adeilton Pereira, Paschoal, Alexandre Rocha, Paschoal, Carlos William de Araujo
In this work Ba(Zn1/3Nb2/3)O3_3$ thin films were prepared by the polymeric precursors method. A detailed description of the procedure to obtain the precursors and deposition was presented. High quality polycrystalline films of Ba(Zn1/3Nb2/3)O3 were o
Externí odkaz:
http://arxiv.org/abs/1212.2272
In this work a new empirical tolerance factor for compounds with pyrochlore structure is proposed. This suggested tolerance factor is based on experimental structural data and on the tolerance factors currently proposed. However, since it does not de
Externí odkaz:
http://arxiv.org/abs/1212.0908
Autor:
Natália Santana dos Santos, Andressa de Souza S. Medeiros, Nildo Pereira da Silva Junior, Júlio Budiski Herculani, Simone de França Tonhão, William de Araujo Cadette, Jorge Marques Prates
Publikováno v:
Anais do III Simpósio Brasileiro de Educação em Computação (EDUCOMP 2023).
Com o avanço tecnológico, o conhecimento básico de Computação se tornou algo essencial para a maioria dos jovens do século XXI. Entretanto, o ensino de Computação não é oferecido na maioria das escolas públicas, estas, urbanas ou rurais. A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ef2431fb171709d1c7403b3ae900b4b
https://doi.org/10.5753/educomp.2023.228136
https://doi.org/10.5753/educomp.2023.228136