Atomic substitution effects on the structural and vibrational properties of NixPb1-xTiO3: X-ray diffraction and Raman scattering investigations

Autor: R. C. da Costa, T. A. de Toledo, J. W. M. Espinosa, P. S. Pizani

Publikováno v: AIP Advances, Vol 5, Iss 7, Pp 077113-077113-7 (2015)

The effects of the atomic substitution of Pb by Ni in the PbTiO3 ferroelectric perovskite on the vibrational and structural properties was studied using x-ray diffraction and Raman scattering. It was observed that for Ni concentrations between 0.0 an

Externí odkaz: https://doaj.org/article/43dbd1872e994b23a5a1fef7cfb5a571

O papel dos modificadores de rede na produção da fotoluminescência no CaWO4 The role of network modifiers in the production of photoluminescence in CaWO4

Autor: F. R. C. Ciaco, F. M. Pontes, C. D. Pinheiro, E. R. Leite, S. R. de Lazaro, J. A. Varela, P. S. Pizani, C. A. Paskocimas, A. G. Souza, E. Longo

Publikováno v: Cerâmica, Vol 50, Iss 313, Pp 43-49 (2004)

Discutiu-se a fotoluminescência para o tungstato de cálcio amorfo, observada à temperatura ambiente. Verificou-se que há concordância entre os resultados experimentais e teóricos. Neste trabalho foram simuladas as estruturas cristalinas e amorf

Externí odkaz: https://doaj.org/article/c540addf480c4d3cb74253579a2fa6a9

Efeitos da temperatura e concentração de La na forma de fótons ópticos transversais A1 no sistema PbTiO3

Autor: J. J. Barba-O, P. S. Pizani, M. R. Joya

Publikováno v: Cerâmica, Volume: 58, Issue: 347, Pages: 313-316, Published: SEP 2012
Cerâmica v.58 n.347 2012
Cerâmica (São Paulo. Online)
Universidade de São Paulo (USP)
instacron:USP

The structural phase transition from ferroelectric to paraelectric was studied by Raman scattering in the ceramic lead titanate (PbTiO3) doped with lanthanum (La). A1 vibrational mode contains some sub-peaks that have been associated in literature wi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11707411bfbbc358fd92c20455064d49
https://doi.org/10.1590/s0366-69132012000300006

Intense blue and green photoluminescence emissions at room temperature in barium zirconate powders

Autor: Elson Longo, José Arana Varela, Valmor Roberto Mastelaro, Júlio C. Sczancoski, P. S. Pizani, J. W. M. Espinosa, Laécio S. Cavalcante, Máximo Siu Li, F. S. De Vicente, Alain Michalowicz

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Intense blue and green photoluminescence (PL) emissions were observed at room temperature in barium zirconate (BaZrO3) powders prepared by chemical method. The powders were analyzed by X-ray diffraction (XRD), X-ray absorption near edge spectroscopy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57321bea766801b41f9a9ef513515363
https://doi.org/10.1016/j.jallcom.2008.03.080

BaMoO4 powders processed in domestic microwave-hydrothermal: Synthesis, characterization and photoluminescence at room temperature

Autor: Júlio C. Sczancoski, Elson Longo, Miryam R. Joya, R. L. Tranquilin, José Arana Varela, P. S. Pizani, Laécio S. Cavalcante

Publikováno v: Journal of Physics and Chemistry of Solids. 69:2674-2680

In this paper, BaMoO4 powders were prepared by the coprecipitation method and processed in a domestic microwave-hydrothermal. The obtained powders were characterized by X-ray diffraction (XRD), Fourier transform Raman (FT-Raman) spectroscopy, ultravi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c3ff012a4e2ed9758e753bed0b123fce
https://doi.org/10.1016/j.jpcs.2008.06.107