Temperature-driven structural transformations in Ca/Ti- and Ba/Ti-doped BiFeO3
| Autor: | D.V. Zhaludkevich, Maxim V. Silibin, V. A. Khomchenko, K.N. Nekludov, V. V. Sikolenko, José A. Paixão, Dmitry V. Karpinsky, Alexandra Franz, S.V. Dubkov, S.I. Latushka |
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| Rok vydání: | 2019 |
| Předmět: |
Phase transition
Materials science Mechanical Engineering Doping Ionic bonding 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Ferroelectricity 0104 chemical sciences Crystallography Polarization density Mechanics of Materials Phase (matter) General Materials Science Multiferroics Orthorhombic crystal system 0210 nano-technology |
| Zdroj: | Materials Letters. 254:305-308 |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2019.07.091 |
| Popis: | The structural parameters of the Bi0.85AE0.15Fe0.85Ti0.15O3 (AE = Ca and Ba) multiferroics have been determined using variable temperature neutron powder diffraction. The compounds adopt the polar rhombohedral R3c structure near room temperature and undergo phase transitions into either the nonpolar orthorhombic Pnma (AE = Ca) or cubic Pm 3 - m (AE = Ba) structures on heating. In the ferroelectric phase, a temperature-driven lattice expansion is accompanied by both a diminishing of the off-center ionic displacements (thus resulting in a decrease in the spontaneous electric polarization) and a reduction in the magnitude of the antiphase oxygen octahedra tilting. Being largely different for the materials under study, the latter parameter is supposed to specify the dissimilarity in their magnetic properties. |
| Databáze: | OpenAIRE |
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