Combining XRD and Raman spectroscopy techniques to probe the solid solution and composite forms of Pb1-xCoxTiO3 systems
| Autor: | T.A. Toledo, Ariano De Giovanni Rodrigues, T.R. Cunha, R.C. da Costa, João Elias Figueiredo Soares Rodrigues, Paulo S. Pizani |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Rietveld refinement Mechanical Engineering Composite number Analytical chemistry 02 engineering and technology Soft modes 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences symbols.namesake Mechanics of Materials Phase (matter) symbols Curie temperature General Materials Science 0210 nano-technology Raman spectroscopy Raman scattering Solid solution |
| Zdroj: | Materials Research Bulletin. 107:462-467 |
| ISSN: | 0025-5408 |
| Popis: | Raman scattering and XRD data allied to Rietveld refinement were used to investigate the structural and vibrational properties of Pb1-xCoxTiO3 samples with x ranging from 0.0 to 1.0. The results showed reductions in the tetragonallity factor and in the wavenumber of E(1TO) soft mode in the interval between x = 0.0 (c/a = 1.063 and E(1TO) = 89 cm−1) and x = 0.2 (c/a = 1.042 and E(1TO) = 81 cm−1). These parameters present a partial recovery for x > 0.4. Quantitative phase analyses combined with SEM indicate the formation of a solid solution for x less than 0.2 and composite formation of PbTiO3 and CoTiO3 for x higher than 0.2. From the temperature-induced softening of the E(1TO) mode, it was investigated the effect of the atomic substitution on the PbTiO3 Curie temperature, showing a minimum at 720 K (x ∼ 0.4) compared to 763 K (x = 0). |
| Databáze: | OpenAIRE |
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