Cost-effective solid-state reactive sintering method for high conductivity proton conducting yttrium-doped barium zirconium ceramics

Tong, Jianhua; Clark, Daniel; Hoban, Mykle L; O’Hayre, Ryan

doi:10.1016/j.ssi.2010.02.008

Cited by 258 publications

(185 citation statements)

References 24 publications

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“…The range of each measurement was estimated using the step size value as the uncertainty of the calculated FHWM, similar to that described previously 17 . Differences were considered relevant when the value range did not overlap.…”

Section: Methodsmentioning

confidence: 99%

Does crystallinity of extracted bone mineral increase over storage time?

et al. 2013

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It was recently shown that the crystallinity of extracted bone mineral samples from the fin bones of zebrafish could increase over storage time. This would have implications in many studies in which the samples need to be stored until analysis. The aim of this study was to further evaluate if the crystallinity of extracted bone mineral increases over storage time. The extracted mineral was a biological bone-like apatite produced in osteoblast cell cultures. The overall characterization of the mineral was done by energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and high-resolution transmission electron microscopy. In order to evaluate possible changes in crystallinity over storage time, the same sample was analyzed by X-ray diffraction immediately after mineral extraction and after 18 months of storage. In conclusion, no statistically relevant changes were observed over storage time, although the occurrence of a slight increase in crystallinity could be discussed in the stored mineral sample.

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Section: Methodsmentioning

confidence: 99%

Does crystallinity of extracted bone mineral increase over storage time?

et al. 2013

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“…PXRD patterns of both the as-prepared NiO-BSCZGY composites and their respective heat-treated composite samples prepared by mechanical mixing show only the diffraction peaks corresponding to BSCZGY and NiO phases (Figure 1 (a-c)). It has been demonstrated that small amount of Ni might substitute the Zr due to the similar ionic radius (r Zr(IV) = 0.72 Å, r Ni(II) = 0.69 Å) during mixing through milling and high temperature firing process Shannon, 1976;Babilo & Haile, 2005;Tong, Clark, Hoban, & O'Hayre, 2010). However, PXRD patterns did not show a shift in 2θ peak positions, and the lattice constant for BSCZGY phase almost remained constant ~ 4.298 Å for all the three anode compositions (Table 1).…”

Section: Materials Preparation and Experimental Proceduresmentioning

confidence: 99%

Ni-Ba0.5Sr0.5Ce0.6Zr0.2Gd0.1Y0.1O3-Delta Anode Composites for Proton Conducting Solid Oxide Fuel Cells (H-SOFCs)

Singh¹,

Baral²,

Thangadurai³

2016

JMSR

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In this paper, we report the electrochemical properties of Ni-Ba 0.5 Sr 0.5 Ce 0.6 Zr 0.2 Gd 0.1 Y 0.1 O 3-δ (BSCZGY) anode composites in 3% H 2 O-H 2 for proton conducting solid oxide fuel cells (H-SOFCs). Ni-BSCZGY composites with volume ratio of 30:70, 40:60, and 50:50 were synthesised through mechanical mixing and combustion methods. In combustion method, auto-ignition step led to brown coloured ash, which was calcined at 1000

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“…Tong et al introduced NiO directly into the oxide precursors of BZY to sinter dense ceramics, with the transition phase BaY 2 NiO 5 functioning as the sintering aid. Grain sizes as large as 5 lm were achieved after sintering at 1500°C for 24 h. 8,21 Chen et al further found that BaY 2 NiO 5 was formed as a secondary phase after sintering, and transformed to Ni metallic particles after being treated in a wet reducing atmosphere at high temperature. 7 This reactive sintering method has been verified by Ricote by obtaining BZY pellets with 1.3-lm grain size after sintering at 1500°C for 4 h. 22 Haile's group developed a similar reactive sintering method without using a sintering aid, but rather utilizing BaCO 3 as a precursor.…”

Section: Introductionmentioning

confidence: 99%

Two-Step Reactive Aid Sintering of BaZr0.8Y0.2O3−δ Proton-Conducting Ceramics

Wang

Chen

Zhang

et al. 2015

Journal of Elec Materi

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Ceramic-based proton conductors enable high-temperature hydrogen economy applications such as hydrogen separation membranes, fuel cells, and steam electrolyzers. BaZr 0.8 Y 0.2 O 3Àd (BZY) proton-conducting oxide possesses the highest level of proton conductivity reported to date, but poor sinterability hinders its widespread utilization. In this paper, we report a two-step reactive aid sintering (TRAS) method involving the introduction of BaCO 3 and B 2 O 3 -Li 2 O for the preparation of dense BZY ceramics sintered at 1500°C. The resulting BZY samples showed a pure perovskite structure with a dramatic increase in the relative density to 91.5%. In addition, the shrinkage during sintering was improved to 19.3% by a TRAS method as compared to 2.6% by the conventional solid date reaction method. The bulk conductivity was improved due to enhanced densification, while the grain boundary conductivity decreased due to the blocking behavior of the sintering aid resulting in a decrease in the total conductivity of the samples.

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Cost-effective solid-state reactive sintering method for high conductivity proton conducting yttrium-doped barium zirconium ceramics

Cited by 258 publications

References 24 publications

Does crystallinity of extracted bone mineral increase over storage time?

Does crystallinity of extracted bone mineral increase over storage time?

Ni-Ba0.5Sr0.5Ce0.6Zr0.2Gd0.1Y0.1O3-Delta Anode Composites for Proton Conducting Solid Oxide Fuel Cells (H-SOFCs)

Two-Step Reactive Aid Sintering of BaZr0.8Y0.2O3−δ Proton-Conducting Ceramics

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