15 documents found, page 1 of 2
Effects of crystallization kinetics on the dielectric and electrical properties...
González-Abreu, Y. [UNESP]; Reis, S. P.; Freitas, F. E. [UNESP]; Eiras, J. A.; Araújo, E. B. [UNESP]Made available in DSpace on 2022-04-28T19:40:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-06-01; BiFeO3 thin films were prepared using the chemical solution route on Pt/TiO2/SiO2/Si(100) substrates under different crystallization kinetics. The crystallization kinetic effects on the dielectric and electrical properties have been investigated. These properties included dielectric permittivity, electr...
An alternative chemical route for synthesis of SrBi2Ta2O9 thin films
Zanetti, S. M.; Leite, E. R.; Longo, E.; Araújo, E. B.; Chiquito, A. J.; Eiras, J. A.; Varela, J. A. [UNESP]Made available in DSpace on 2022-04-29T08:46:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2000-01-01; SrBi2Ta2O9 was synthesized by the modified polymeric precursor method using precursor reagents such as carbonate, nitrate, or oxide. The films were deposited onto Pt/Ti/SiO2/Si(100) substrates by spin coating and crystallized at temperatures ranging from 700 to 800 °C in air. Microstructural and phase e...
Raman scattering study of the (formula presented) system: Rhombohedral-monoclin...
Souza Filho, A. G.; Lima, K. C.V.; Ayala, A. P.; Guedes, I.; Freire, P. T.C.; Melo, F. E.A.; Mendes Filho, J.; Araújo, E. B. [UNESP]; Eiras, J. A.Made available in DSpace on 2022-04-29T07:14:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-01-01; In this paper we present a Raman-scattering study of the phase transitions in the (formula presented) systems around the morphotropic phase boundary over a wide temperature range. The boundary between rhombohedral and monoclinic phases was found to be a quasivertical line between (formula presented) We ...
On the influence of pyrochlore phase on ferroelectric and dielectric properties...
Lima, E. C.; Araujo, E. B. [UNESP]; Eiras, J. A.Made available in DSpace on 2020-12-12T02:03:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-02-17; The intrinsic contribution of dielectric permittivity was obtained in thin films of PZT pyrolyzed at different temperatures. Pyrochlore phases were observed in films pyrolyzed at temperatures above 350 °C, while only the perovskite phase grows in films pyrolyzed at temperatures lower than 300 °C. Dielec...
Local structure and hybridization states in Ba0.9Ca0.1Ti1-xZrxO3 ceramic compou...
Eiras, J. A.
Local structure and hybridization states in Ba0.9Ca0.1Ti1 xZrxO3 ceramic compou...
Mastelaro, Valmor Roberto; Favarim, Higor Rogerio; Mesquita, Alexandre; Michalowicz, A.; Moscovici, J.; Eiras, J. A.This paper reports on a multi-edge X-ray absorption analysis to elucidate how the substitution of Ti4+ by Zr4+ ions acts on the local order structure and on the O 2p hybridization states of Ba0.9Ca0.1Ti1_xZrxO3 (BCZT) lead-free ceramic compounds, inducing a ferroelectric evolution from a normal to a relaxor character. Ti, Ba, Zr and O X-ray absorption spectra were measured to probe the local and electronic stru...
Structural, dielectric and ferroelectric properties of Nb-doped PZT thin films ...
Araújo, E. B. [UNESP]; Eiras, J. A.Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:20:23Z No. of bitstreams: 0; Made available in DSpace on 2014-05-27T11:20:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-01-01; Recently, was proposed a chemical method for preparation of ferroelectric thin films based on oxide precursors. In this work, PZT thin films were prepared to attest the viability of th...
The use of pulsed electric acoustic technique for measuring the polarization re...
Moura, W. A.; Eiras, J. A.; Lente, M.; Tomioka, J.; Wisniewski, C.; Giacometti, José Alberto [UNESP]Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:20:23Z No. of bitstreams: 0; Made available in DSpace on 2014-05-27T11:20:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-01-01; The pulsed electric acoustic technique, PEA, has been usually applied to probe space charge profiles in polymers. Preliminary PEA results using a ferroelectric ceramic are presented. I...
Raman scattering study of the PbZr1-xTixO3 system: Rhombohedral-monoclinic-tetr...
Souza Filho, A. G.; Lima, K. C. V.; Ayala, A. P.; Guedes, I.; Freire, P. T. C.; Melo, F. E. A.; Mendes Filho, J.; Araújo, E. B. [UNESP]; Eiras, J. A.Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:20:30Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:38:23Z : No. of bitstreams: 1 2-s2.0-20744439114.pdf: 118943 bytes, checksum: b9f8552263badc72d1e6c099d95bb9fb (MD5); Made available in DSpace on 2014-05-27T11:20:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-10-01; In this paper we present a Raman-sc...
The use of pulsed electric acoustic technique for measuring electric field prof...
Giacometti, J. A. [UNESP]; Eiras, J. A.; Lente, M.; Tomioka, J.; Wisniewski, C.; Moura, W. A.Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:20:32Z No. of bitstreams: 0; Made available in DSpace on 2014-05-27T11:20:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-12-01; The pulsed electric acoustic technique, PEA, have been usually applied to probe space charge profiles in polymers. In this work we show preliminary results obtained with lead zirconate...