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Effect of synthesis conditions on the morphology and crystal structure of biferroic Bi5Ti3FeO15

Authors
Journal
Ceramics International
0272-8842
Publisher
Elsevier
Volume
40
Issue
5
Identifiers
DOI: 10.1016/j.ceramint.2013.12.094
Keywords
  • A. Powders: Chemical Preparation
  • A. Sintering
  • B. X-Ray Methods
  • D. Aurivillius Phases

Abstract

Abstract The biferroic Aurivillius-phase Bi5Ti3FeO15 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 50nm to 10μm. 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 A21am. The lattice parameters (Å) 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).

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