| Full text | |
| Author(s): |
Barbosa Quiroga, David Antonio
;
Camilo Albornoz Diaz, Julio Cesar
;
Venet, Michel
;
Rodrigues, Ariano De Giovanni
;
Florencio, Odila
;
da Silva, Jr., Paulo Sergio
Total Authors: 6
|
| Document type: | Journal article |
| Source: | Journal of Alloys and Compounds; v. 691, p. 498-503, JAN 15 2017. |
| Web of Science Citations: | 6 |
| Abstract | |
In this work, high density Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3-BaTiO3 (BNBK) lead-free ceramics with nominal compositions crossing the morphotropic phase boundary region were prepared and their crystalline phases were investigated by a combination of the X-ray diffraction and Raman spectroscopy techniques, at room temperature. Results show that the BNBK82 sample has a single tetragonal phase (P4mm) and the BNBK91 and BNBK93 samples, single rhombohedral phase (R3c), while the BNBK88 and BNBK86 compositions showed coexistence of the above two phases with a not previously reported additional tetragonal P4bm phase. The Raman spectra deconvolution, for the BNBK86 and BNBK88 samples, also demonstrates the coexistence of rhombohedral and tetragonal phases, with phase fractions in very good agreement with the Rietveld refinement results, evidencing these compositions are located in the MPB region of the BNBK system. Results in this work suggest the MPB region proposed by Takenaka, for the BNBK system, is more appropriate than the one proposed by Trelcat. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 13/00134-7 - Obtaining and improvement of properties of lead free magnetoelectric composites |
| Grantee: | Michel Venet Zambrano |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 12/08457-7 - Study of the phase transitions of the lead-free piezoceramics by mechanical spectroscopy |
| Grantee: | Paulo Sergio da Silva Junior |
| Support Opportunities: | Regular Research Grants |