XRD, Raman and electrical studies on the (1−x)(Na0.5Bi0.5)TiO3−xBaTiO3 lead free ceramics
| Autor: | Hamadi Khemakhem, Mohamed Rguitti, Hamza Lidjici, Mokhtar Berrahal, Med Amine Hentatti, Brahim Lagoun |
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| Rok vydání: | 2015 |
| Předmět: |
Diffraction
Phase boundary Materials science Mechanical Engineering Metals and Alloys Analytical chemistry Mineralogy Trigonal crystal system Tetragonal crystal system symbols.namesake Piezoelectric constant Mechanics of Materials visual_art Materials Chemistry visual_art.visual_art_medium symbols Ceramic Raman spectroscopy Solid solution |
| Zdroj: | Journal of Alloys and Compounds. 618:643-648 |
| ISSN: | 0925-8388 |
| Popis: | Lead-free piezoceramics (1− x )Bi 0.5 Na 0.5 TiO 3 – x BaTiO 3 ( x = 0.00, 0.03, 0.05, 0.065, 0.07, 0.08 and 0.10) have been prepared by the conventional solid reaction method and their structure and electrical properties were systematically investigated. X-ray diffraction analysis indicates that a solid solution is formed in (1− x )BNT– x BT ceramics with presence of a morphotropic phase boundary (MPB) between rhombohedral and tetragonal phases in the composition range x = 0.065–0.07 at room temperature. The distinct changes of the Raman spectra with increasing of BaTiO 3 content which were correlated with XRD results were observed. It was found that the MPB compositions show improved electrical properties and reach preferred values at x = 0.065; the piezoelectric constant d 33 and electromechanical coupling factor k t are 150 pC/N and 51% respectively. |
| Databáze: | OpenAIRE |
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