Phase diagram for Bi-site La-doped BiFeO3BaTiO3 lead-free piezoelectric ceramics
| Autor: | Da Jeong Kim, Fazli Akram, Myang Hwan Lee, Won-Jeong Kim, Hai In Choi, Myong-Ho Kim, Muhammad Habib, Tae Kwon Song |
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| Rok vydání: | 2021 |
| Předmět: |
Quenching
Morphotropic phase boundary Materials science BiFeO3-BaTiO3 Metals and Alloys Analytical chemistry La-doping 02 engineering and technology Dielectric Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity Ferroelectricity 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Tetragonal crystal system Phase (matter) lcsh:TA401-492 lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Lead-free piezoceramics Phase diagram |
| Zdroj: | Journal of Materiomics, Vol 7, Iss 1, Pp 40-50 (2021) |
| ISSN: | 2352-8478 |
| DOI: | 10.1016/j.jmat.2020.07.001 |
| Popis: | Three different series of lead-free ceramics, i.e., (1-y)Bi1.03(1-x)LaxFeO3–yBaTiO3 (y = 0.27, x = 0.00–0.12), (y = 0.30, x = 0.00–0.10), and (y = 0.33, x = 0.00–0.08) are prepared via a conventional solid-state reaction with water quenching. From X-ray diffraction and electrical property measurements, two morphotropic phase boundaries (MPBs) are discovered in all three ceramic systems. The first MPB (MPB-I) appeared between rhombohedral and tetragonal phases, whereas the second MPB (MPB-II) appeared between tetragonal and cubic-like phases. The highest direct piezoelectric coefficients (d33 = 201, 274, and 268 pC/N) are mainly attributed to the typical MPB-I of the rhombohedral and tetragonal phases. However, the highest converse piezoelectric coefficients (d33* = 490, 500, and 570 pm/V with Curie temperature > 330 °C) are obtained for compositions near to the MPB-II. A significant enhancement in the dielectric constant at low temperature is associated with the local structural heterogeneity by La3+ doping, which serves as an origin for a high piezoelectric strain response. Based on the crystal structure as well as on the dielectric, ferroelectric, and piezoelectric properties, a phase diagram is constructed for La-doped BiFeO3 BaTiO3 ceramics. This phase diagram reveals the relationship between piezoelectric performance and crystal structure. |
| Databáze: | OpenAIRE |
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