Effect of synthesis conditions on the morphology and crystal structure of biferroic Bi5Ti3FeO15
| Autor: | M. García-Guaderrama, Gregorio Guadalupe Carbajal Arízaga, Alejandro Duran |
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| Rok vydání: | 2014 |
| Předmět: |
Diffraction
Materials science Rietveld refinement Process Chemistry and Technology Analytical chemistry Ionic bonding Crystal structure Synchrotron Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Tetragonal crystal system Crystallography law Materials Chemistry Ceramics and Composites Orthorhombic crystal system Molten salt |
| Zdroj: | Ceramics International. 40:7459-7465 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2013.12.094 |
| Popis: | The biferroic Aurivillius-phase Bi 5 Ti 3 FeO 15 was obtained by molten salt synthesis (MSS) using an equimolar mixture of NaCl/KCl as the ionic solvent. The morphology, size and crystal structure of the material was strongly dependent on the synthesis conditions. Particles with plate-like morphology and high aspect relation were obtained with sizes ranging from 50 nm to 10 μm. Using conventional X-ray diffraction, it was qualitatively determined that at synthesis temperatures lower than 850 °C, the phase has a tetragonal structure, while at temperatures at or above 850 °C, the phase presents an orthorhombic structure. Synchrotron X-ray diffraction and Rietveld refinement were used to determine the crystal structure of the best crystallized phase in detail (synthesis temperature: 850 °C). The model that best fits the experimental data is the orthorhombic space group A 2 1 am . The lattice parameters (A) determined are a =5.47722(6), b =5.44365(6) and c =41.17004(37). The crystalline particles obtained were used to obtain highly textured polycrystalline material with high densities ( ρ >96% of theoretical maximum density). |
| Databáze: | OpenAIRE |
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