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Title: Synthesis of BaTiO[subscript 3]-20wt%CoFe[subscript 2]O[subscript 4] Nanocomposites via Spark Plasma Sintering

Abstract

Barium titanate-20wt% cobalt ferrite (BaTiO{sub 3}-20wt%CoFe{sub 2}O{sub 4}) nanocomposites were sintered from nanocrystalline BaTiO{sub 3} and CoFe{sub 2}O{sub 4} powders using spark plasma sintering (SPS) and pressureless sintering (PS) techniques. Using SPS, dense polycrystalline composites were obtained at a sintering temperature as low as 860 C and a time of 5 min whereas PS required a higher sintering temperature (1150 C) and time (120 min) to obtain similarly dense composites. Microstructural analysis of the composites showed that both the techniques retained nanocrystalline grain sizes after sintering. High resolution X-ray diffraction measurements revealed that the BaTiO{sub 3}-20wt%CoFe{sub 2}O{sub 4} composites sintered by the SPS technique did not exhibit formation of any new phase(s) due to reaction between the BaTiO{sub 3} and CoFe{sub 2}O{sub 4} phases during sintering. However, the PS technique resulted in the formation of additional phases (other than the BaTiO{sub 3} and CoFe{sub 2}O{sub 4} phases) in the composites. While the composites synthesized by SPS were of superior phase-purity, evidence of Fe diffusion from the spinel to the perovskite phase was found from X-ray diffraction and permittivity measurements.

Authors:
; ; ; ;  [1]
  1. (Florida)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
OTHER U.S. STATESU.S. ARMY RESEARCH
OSTI Identifier:
1048962
Resource Type:
Journal Article
Journal Name:
J. Am. Ceram. Soc.
Additional Journal Information:
Journal Volume: 95; Journal Issue: (8) ; 08, 2012; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; BARIUM; COBALT; DIFFUSION; FERRITE; GRAIN SIZE; PERMITTIVITY; PEROVSKITE; PLASMA; RESOLUTION; SINTERING; SPINELS; SYNTHESIS; X-RAY DIFFRACTION

Citation Formats

Ghosh, Dipankar, Han, Hyuksu, Nino, Juan C., Subhash, Ghatu, and Jones, Jacob L. Synthesis of BaTiO[subscript 3]-20wt%CoFe[subscript 2]O[subscript 4] Nanocomposites via Spark Plasma Sintering. United States: N. p., 2012. Web. doi:10.1111/j.1551-2916.2012.05221.x.
Ghosh, Dipankar, Han, Hyuksu, Nino, Juan C., Subhash, Ghatu, & Jones, Jacob L. Synthesis of BaTiO[subscript 3]-20wt%CoFe[subscript 2]O[subscript 4] Nanocomposites via Spark Plasma Sintering. United States. doi:10.1111/j.1551-2916.2012.05221.x.
Ghosh, Dipankar, Han, Hyuksu, Nino, Juan C., Subhash, Ghatu, and Jones, Jacob L. Tue . "Synthesis of BaTiO[subscript 3]-20wt%CoFe[subscript 2]O[subscript 4] Nanocomposites via Spark Plasma Sintering". United States. doi:10.1111/j.1551-2916.2012.05221.x.
@article{osti_1048962,
title = {Synthesis of BaTiO[subscript 3]-20wt%CoFe[subscript 2]O[subscript 4] Nanocomposites via Spark Plasma Sintering},
author = {Ghosh, Dipankar and Han, Hyuksu and Nino, Juan C. and Subhash, Ghatu and Jones, Jacob L.},
abstractNote = {Barium titanate-20wt% cobalt ferrite (BaTiO{sub 3}-20wt%CoFe{sub 2}O{sub 4}) nanocomposites were sintered from nanocrystalline BaTiO{sub 3} and CoFe{sub 2}O{sub 4} powders using spark plasma sintering (SPS) and pressureless sintering (PS) techniques. Using SPS, dense polycrystalline composites were obtained at a sintering temperature as low as 860 C and a time of 5 min whereas PS required a higher sintering temperature (1150 C) and time (120 min) to obtain similarly dense composites. Microstructural analysis of the composites showed that both the techniques retained nanocrystalline grain sizes after sintering. High resolution X-ray diffraction measurements revealed that the BaTiO{sub 3}-20wt%CoFe{sub 2}O{sub 4} composites sintered by the SPS technique did not exhibit formation of any new phase(s) due to reaction between the BaTiO{sub 3} and CoFe{sub 2}O{sub 4} phases during sintering. However, the PS technique resulted in the formation of additional phases (other than the BaTiO{sub 3} and CoFe{sub 2}O{sub 4} phases) in the composites. While the composites synthesized by SPS were of superior phase-purity, evidence of Fe diffusion from the spinel to the perovskite phase was found from X-ray diffraction and permittivity measurements.},
doi = {10.1111/j.1551-2916.2012.05221.x},
journal = {J. Am. Ceram. Soc.},
issn = {0002-7820},
number = (8) ; 08, 2012,
volume = 95,
place = {United States},
year = {2012},
month = {10}
}