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Some observations on the synthesis and electrolytic properties of (Ba1-xCax) (M0.9Y0.1)O3, M = Ce, Zr-based samples modified with calcium Cover

Some observations on the synthesis and electrolytic properties of (Ba1-xCax) (M0.9Y0.1)O3, M = Ce, Zr-based samples modified with calcium

Materials Science-Poland
Volume 34 (2016): Issue 1 (March 2016)
By:
Open Access
|Apr 2016

Figures & Tables

Fig. 1

a) DTA and TG curves recorded for dried BaCe0.9Y0.1O3 and Ba0.95Ca0.05Ce0.9Y0.1O3 precursors; b) EGA gas analysis performed during DTA/TG thermal studies.
a) DTA and TG curves recorded for dried BaCe0.9Y0.1O3 and Ba0.95Ca0.05Ce0.9Y0.1O3 precursors; b) EGA gas analysis performed during DTA/TG thermal studies.

Fig. 2

Evolution of the X-ray diffraction pattern for theBaCe0.9Y0.1O3dried precursor.
Evolution of the X-ray diffraction pattern for theBaCe0.9Y0.1O3dried precursor.

Fig. 3

Variations in cell volume vs. chemical compositionof the (Ba1-xCax)(M0.9Y0.1), M = Ce, Zrsintered samples series.
Variations in cell volume vs. chemical compositionof the (Ba1-xCax)(M0.9Y0.1), M = Ce, Zrsintered samples series.

Fig. 4

Representative TEM microscopy imagesrecorded for: Ba0.95Ca0.05Zr0.9Y0.1O3 (a) and Ba0.95Ca0.05Ce0.9Y0.1O3 (b) powders.
Representative TEM microscopy imagesrecorded for: Ba0.95Ca0.05Zr0.9Y0.1O3 (a) and Ba0.95Ca0.05Ce0.9Y0.1O3 (b) powders.

Fig. 5

Dilatometric curves recorded for pellets during non-isothermalconditions between 25 and 1300 °C.
Dilatometric curves recorded for pellets during non-isothermalconditions between 25 and 1300 °C.

Fig. 6

SEM microphotographs of the microstructureof sintered samples: (a) BaZr0.9Y0.1O3, (b) Ba0.95Ca0.05Zr0.9Y0.1O3, and (c) Ba0.95Ca0.1 (Ce0.9Y0.1) O3.
SEM microphotographs of the microstructureof sintered samples: (a) BaZr0.9Y0.1O3, (b) Ba0.95Ca0.05Zr0.9Y0.1O3, and (c) Ba0.95Ca0.1 (Ce0.9Y0.1) O3.

Fig. 7

The temperature dependence of total electrical conductivity of (Ba1-xCax) (M0.9Y0.1) O3 M =Ce, Zr sintered samples measured in dry air.
The temperature dependence of total electrical conductivity of (Ba1-xCax) (M0.9Y0.1) O3 M =Ce, Zr sintered samples measured in dry air.

Fig. 8

The family of I-t curves recorded at 700 °C at overpotential (∆E −0.05 to −0.5 V). The Ba0.9Ca0.1Ce0.9Y0.1O3 electrolyte was used in this measurement.
The family of I-t curves recorded at 700 °C at overpotential (∆E −0.05 to −0.5 V). The Ba0.9Ca0.1Ce0.9Y0.1O3 electrolyte was used in this measurement.

Fig. 9

The family of I-t curves recorded at 700 °C under ∆E = −0.5 V in different gas atmospheres. The BaZr0.9Y0.1O3 electrolyte was used in this investigation.
The family of I-t curves recorded at 700 °C under ∆E = −0.5 V in different gas atmospheres. The BaZr0.9Y0.1O3 electrolyte was used in this investigation.

Fig. 10

The Nyquist plots for the Pt|BZY system recorded before and after polarization ∆E =-0.5 V. The measurements were performed at 700 °C in a wet argon gas atmosphere.
The Nyquist plots for the Pt|BZY system recorded before and after polarization ∆E =-0.5 V. The measurements were performed at 700 °C in a wet argon gas atmosphere.

Fig. 11

SEM images of Pt deposit on the surface of the BZY electrolyte recorded after polarization experiments.
SEM images of Pt deposit on the surface of the BZY electrolyte recorded after polarization experiments.

Fig. 12

The temperature dependence of OCV on the cells: O2|Pt|BCY and 5CBCY|Pt|H2 recorded between 500 to 850 °C.
The temperature dependence of OCV on the cells: O2|Pt|BCY and 5CBCY|Pt|H2 recorded between 500 to 850 °C.

Fig.13

The family curves U-I and P-I recorded for the cell: H2|Pt|BZY and 5CBZY|Pt|O2 at 850 °C.
The family curves U-I and P-I recorded for the cell: H2|Pt|BZY and 5CBZY|Pt|O2 at 850 °C.

The total electrical conductivity σ (S/cm) andactivation energy calculated in the temperature range of 300 to 700 °C_ Data of measurements in wet 5 % H2 in Ar_

Materialσ [S/cm] at 600 °CEa [eV]
BaZr0.9Y0.1O38.29 × 10–40.78
Ba0.95Ca0.05Zr0.9Y0.1O31.24 × 10–30.74
Ba0.9Ca0.1Zr0.9Y0.1O39.05 × 10–40.80
BaCe0.9Y0.1O31.16 × 10–30.64
Ba0.95Ca0.05Ce0.9Y0.1O38.21 × 10–30.53
Ba0.9Ca0.1Ce0.9Y0.1O34.11 × 10–30.57

Hardness HV and fracture toughness KIc of selected (Ba1-xCax) (M0_9Y0_1) O3, M = Zr, Ce_

MaterialHV, GPaKICMPa·m0.5
BaZr0.9Y0.1O38.11±0.212.35±0.23
Ba0.95Ca0.05Zr0.9Y0.1O38.36±0.192.42±0.17
Ba0.9Ca0.1Zr0.9Y0.1O38.16±0.272.28±0.18
BaCe0.9Y0.1O37.01±0.181.66±0.24
Ba0.95Ca0.05Ce0.9Y0.1O37.19±0.111.74±0.22
Ba0.9Ca0.1Ce0.9Y0.1O37.24±0.201.88±0.28
DOI: https://doi.org/10.1515/msp-2016-0022 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331
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Language: English
Page range: 101 - 114
Submitted on: Jul 7, 2015
Accepted on: Dec 11, 2015
Published on: Apr 27, 2016
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 4 times per year
Keywords:
ceramics,
electrochemical measurements,
ionic conductivity,
IT-SOFC – intermediate temperature solid oxide fuelcell
Related subjects:
Materials sciences,
Materials sciences, other,
Nanomaterials,
Functional and smart materials,
Materials characterization and properties

© 2016 Magdalena Dudek, Bartłomiej Lis, Alicja Rapacz-Kmita, Marcin Gajek, Andrzej Raźniak, Ewa Drożdż, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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