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Title: Insight into the BiFeO3 flash sintering process by in-situ energy dispersive X-ray diffraction (ED-XRD)

Journal Article · · Ceramics International
 [1];  [2];  [3];  [3];  [4];  [3];  [5];  [6];  [3]
  1. Univ. de Sevilla, Sevilla (Spain). Inst. de Ciencia de Materiales de Sevilla; Rutgers Univ., Piscataway, NJ (United States). Dept. of Materials Science and Engineering
  2. Univ. de Sevilla, Sevilla (Spain). Inst. de Ciencia de Materiales de Sevilla
  3. Rutgers Univ., Piscataway, NJ (United States). Dept. of Materials Science and Engineering
  4. Rutgers Univ., Piscataway, NJ (United States). Dept. of Materials Science and Engineering; Univ. de Sevilla, Sevilla (Spain). Dept. de Química Inorgánica
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), X-ray Science Division
  6. Univ. Sevilla, Sevilla (Spain). Inst. de Ciencia de Materiales de Sevilla

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. Here, 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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); US Department of the Navy, Office of Naval Research (ONR); Spanish Ministerio de Economia y Competitividad (MINECO)
Grant/Contract Number:
AC02-06CH11357; N00014-10-1-042; N00014-17-1-2087
OSTI ID:
1493705
Alternate ID(s):
OSTI ID: 1756467
Journal Information:
Ceramics International, Vol. 45, Issue PB; ISSN 0272-8842
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (1)

Processing and properties of Bi 0.98 R 0.02 FeO 3 (R = La, Sm, Y) ceramics flash sintered at ~650°C in <5 s journal August 2019

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