Artículo
Insight into the BiFeO3 flash sintering process by in-situ energy dispersive X-ray diffraction (ED-XRD)
Autor/es | Pérez Maqueda, Luis Allan
Gil González, Eva Wassel, Mary Anne B. Jha, Shikhar K. Perejón Pazo, Antonio Charalambous, Harry Okasinski, John Sánchez Jiménez, Pedro Enrique Tsakalakos, Thomas |
Departamento | Universidad de Sevilla. Departamento de Química Inorgánica Universidad de Sevilla. Departamento de Ingeniería Química |
Fecha de publicación | 2018 |
Fecha de depósito | 2023-02-17 |
Publicado en |
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Resumen | The sintering mechanism of BiFeO3 has been investigated in-situ by energy dispersive X-ray diffraction (ED-XRD) using a high-energy white collimated X-ray beam from the Advanced Photon Source (Argonne National Laboratories). ... The sintering mechanism of BiFeO3 has been investigated in-situ by energy dispersive X-ray diffraction (ED-XRD) using a high-energy white collimated X-ray beam from the Advanced Photon Source (Argonne National Laboratories). Such radiation is very penetrating thereby allowing measurements of the sample even when placed inside the flash sintering set up. Additionally, the fast ED-XRD measurements permit monitoring the flash sintering process by providing information about phase composition and sample temperature in real time. Moreover, profile scans, obtained by moving the stage vertically while recording the ED-XRD spectra, permit investigating the homogeneity of the flash for the entire length of the sample. All experiments have been complemented by ex-situ studies. It has been concluded that flash sintering of BiFeO3 is a homogeneous process without any directionality effects. Furthermore, flash sintering takes place at quite low temperatures (below the Tc ≈ 830 °C), which may be related to the high quality of the samples, as pure, highly insulating ceramics without evidence of secondary phases with a homogenous nanostructured grain size distribution are obtained by this technique. Moreover, it is also evidenced that the rapid heating of the sample does not seem to justify, at least by itself, the densification process. Therefore, it appears that the electric current should play a role in the enhanced mobility during the sintering process. |
Agencias financiadoras | Office of Naval Research (ONR). United States DOE Office of Science by Argonne National Laboratory Ministerio de Economía y Competitividad (MINECO). España Junta de Andalucía |
Identificador del proyecto | N00014-10-1-042
N00014-17-1-208 4104-7898 DE-AC02-06CH11357 Q2014-52763-C2-1-R CTQ2017-83602-C2 TEP-7858 |
Cita | Pérez Maqueda, L.A., Gil González, E., Wassel, M.A.B., Jha, S.K., Perejón Pazo, A., Charalambous, H.,...,Tsakalakos, T. (2018). Insight into the BiFeO3 flash sintering process by in-situ energy dispersive X-ray diffraction (ED-XRD). Ceramics International, 45 (2), 2828-2834. https://doi.org/10.1016/j.ceramint.2018.07.293. |
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Insight into the BiFeO3flash.pdf | 2.263Mb | [PDF] | Ver/ | |