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Synthesis by spark plasma sintering of a novel protonic/electronic conductor composite: BaCe0.2Zr0.7Y0.1O3-delta /Sr0.95Ti0.9Nb0.1O3-delta (BCZY27/STN95)

Fish, Jason S.; Ricote, Sandrine; Lenrick, Filip LU ; Wallenberg, Reine LU ; Holgate, Tim C.; O'Hayre, Ryan and Bonanos, Nikolaos (2013) In Journal of Materials Science 48(18). p.6177-6185
Abstract
A novel two-phase ceramic composite (cercer) material consisting of a solid solution of barium cerate and -zirconate doped with yttrium (BaCe0.2Zr0.7Y0.1O3-delta : BCZY27), together with niobium-doped strontium titanate (Sr0.95Ti0.9Nb0.1O3-delta : STN95), has been synthesized by solid-state reaction and sintered conventionally (CS) at 1350-1500 A degrees C, as well as by spark plasma sintering (SPS) at 1300-1350 A degrees C. CS samples were porous and exhibited high degrees of inter-phase reaction. Nickel oxide sintering aids did not improve CS sample density. In contrast, samples made by SPS were significantly denser (> 95 %) and showed less reaction between phases. A pseudo-optimum SPS profile was developed, accounting for the effects... (More)
A novel two-phase ceramic composite (cercer) material consisting of a solid solution of barium cerate and -zirconate doped with yttrium (BaCe0.2Zr0.7Y0.1O3-delta : BCZY27), together with niobium-doped strontium titanate (Sr0.95Ti0.9Nb0.1O3-delta : STN95), has been synthesized by solid-state reaction and sintered conventionally (CS) at 1350-1500 A degrees C, as well as by spark plasma sintering (SPS) at 1300-1350 A degrees C. CS samples were porous and exhibited high degrees of inter-phase reaction. Nickel oxide sintering aids did not improve CS sample density. In contrast, samples made by SPS were significantly denser (> 95 %) and showed less reaction between phases. A pseudo-optimum SPS profile was developed, accounting for the effects of thermal expansion mismatch between BCZY27 and STN95. X-ray diffraction indicated secondary phases exist, but there was no indication of their presence at grain boundaries based on thorough study of these regions with high-resolution transmission electron microscopy and selective area electron diffraction. We thus suggest that these phases are present as independent grains in the bulk. It is believed these secondary phases inhibit electronic conductivity in the composite. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Materials Science
volume
48
issue
18
pages
6177 - 6185
publisher
Springer
external identifiers
  • wos:000321285500010
  • scopus:84879966065
ISSN
0022-2461
DOI
10.1007/s10853-013-7414-6
language
English
LU publication?
yes
id
0aafc1c9-efb1-4ea7-b08b-fa1fa7e38500 (old id 3973209)
date added to LUP
2013-08-21 13:29:41
date last changed
2019-03-17 03:49:14
@article{0aafc1c9-efb1-4ea7-b08b-fa1fa7e38500,
  abstract     = {A novel two-phase ceramic composite (cercer) material consisting of a solid solution of barium cerate and -zirconate doped with yttrium (BaCe0.2Zr0.7Y0.1O3-delta : BCZY27), together with niobium-doped strontium titanate (Sr0.95Ti0.9Nb0.1O3-delta : STN95), has been synthesized by solid-state reaction and sintered conventionally (CS) at 1350-1500 A degrees C, as well as by spark plasma sintering (SPS) at 1300-1350 A degrees C. CS samples were porous and exhibited high degrees of inter-phase reaction. Nickel oxide sintering aids did not improve CS sample density. In contrast, samples made by SPS were significantly denser (> 95 %) and showed less reaction between phases. A pseudo-optimum SPS profile was developed, accounting for the effects of thermal expansion mismatch between BCZY27 and STN95. X-ray diffraction indicated secondary phases exist, but there was no indication of their presence at grain boundaries based on thorough study of these regions with high-resolution transmission electron microscopy and selective area electron diffraction. We thus suggest that these phases are present as independent grains in the bulk. It is believed these secondary phases inhibit electronic conductivity in the composite.},
  author       = {Fish, Jason S. and Ricote, Sandrine and Lenrick, Filip and Wallenberg, Reine and Holgate, Tim C. and O'Hayre, Ryan and Bonanos, Nikolaos},
  issn         = {0022-2461},
  language     = {eng},
  number       = {18},
  pages        = {6177--6185},
  publisher    = {Springer},
  series       = {Journal of Materials Science},
  title        = {Synthesis by spark plasma sintering of a novel protonic/electronic conductor composite: BaCe0.2Zr0.7Y0.1O3-delta /Sr0.95Ti0.9Nb0.1O3-delta (BCZY27/STN95)},
  url          = {http://dx.doi.org/10.1007/s10853-013-7414-6},
  volume       = {48},
  year         = {2013},
}