Electrical Properties of Stoichiometric BiFeO3 Prepared by Mechanosynthesis with Either Conventional or Spark Plasma Sintering
Phase‐pure powders of stoichiometric BiFeO3 have been prepared by mechanosynthesis. Ceramics sintered by either conventional heating in air or spark plasma sintering (SPS) followed by oxidative anneal in air are highly insulating at room temperature with resistivity, extrapolated from the Arrhenius...
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Published in | Journal of the American Ceramic Society Vol. 96; no. 4; pp. 1220 - 1227 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Blackwell Publishing Ltd
01.04.2013
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Subjects | |
Online Access | Get full text |
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Summary: | Phase‐pure powders of stoichiometric BiFeO3 have been prepared by mechanosynthesis. Ceramics sintered by either conventional heating in air or spark plasma sintering (SPS) followed by oxidative anneal in air are highly insulating at room temperature with resistivity, extrapolated from the Arrhenius plots, of ~1016 Ωcm and activation energy 1.15(2) eV, comparable with those of a good‐quality BiFeO3 single crystal. By contrast, the as‐prepared SPS sample without the postsinter anneal shows lower resistivity, e.g., ~1010 Ωcm at 25°C and activation energy 0.67(3) eV, indicating some reduction in the sample by the SPS process. The reason for the high conductivity reported for some ceramic samples in the literature remains unclear at present. |
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Bibliography: | ark:/67375/WNG-GFB88NW3-T ArticleID:JACE12186 Spanish Government - No. CTQ 2011-27626; No. MAT 2008-06619 FEDER EPSRC Junta de Andalucía - No. TEP-03002 istex:62D518C0CF5E27E0B895958306BA88B8A922C1BD ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/jace.12186 |