Zobrazeno 1 - 10
of 109
pro vyhledávání: '"Paschoal, Carlos William A."'
Autor:
Lima, Genesis de O., Araújo, Thaylan P., Lima, José Renato de O., Prazeres, Gilza Maria P., Paschoal, Carlos William A., Longo, Elson, Tanaka, Auro A., Maciel, Adeilton P., Barbosa, Diego A.B., Almeida, Marcio Aurélio P.
Publikováno v:
In Boletín de la Sociedad Española de Cerámica y Vidrio January-February 2021 60(1):2-12
Autor:
Ferreira, Wellington Castro, Rodrigues, Gelson Luiz Clemente, Araújo, Bruno Sousa, de Aguiar, Francisco André Andrade, de Abreu Silva, Ariel Nonato Almeida, Fechine, Pierre Basílio Almeida, de Araujo Paschoal, Carlos William, Ayala, Alejandro Pedro
Publikováno v:
In Ceramics International 1 August 2020 46(11) Part A:18056-18062
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
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
Publikováno v:
In Journal of Electron Spectroscopy and Related Phenomena May 2018 225:62-65