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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
Author(s) -
GilGonzález Eva,
Perejón Antonio,
SánchezJiménez Pedro E.,
Raj Rishi,
PérezMaqueda Luis A.
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16718
Subject(s) - sintering , materials science , ceramic , flash (photography) , microstructure , grain boundary , analytical chemistry (journal) , mineralogy , dielectric , phase boundary , phase (matter) , metallurgy , optoelectronics , optics , chemistry , physics , organic chemistry , chromatography
We show that flash sintering produces single‐phase, nanograin‐sized polycrystals of isovalent‐substituted multiferroic ceramics of complex compositions. Single‐phase polycrystals of Bi 0.98 R 0.02 FeO 3 (R = La, Sm, Y) were produced at a furnace temperature of ~650°C in a few seconds by the application of an electric field of 50 V cm −1 , with the current limit set to 40 mA mm −2 . The dielectric and insulating properties compared favorably with expected values. Impedance spectroscopy suggests electrically homogenous microstructure, except for the sample Bi 0.98 La 0.02 FeO 3 that shows a small grain boundary contribution to the impedance. These results reinforce the enabling nature of flash sintering for ceramics which pose difficulties in conventional sintering because they contain low melting constituents or develop secondary phases during the sintering protocol.