Hydrothermal Synthesis and Properties of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x Solid Solutions

W. Huang; P. Shuk; M. Greenblatt

doi:10.1021/cm970425t

Hydrothermal Synthesis and Properties of Ce_1-xSm_xO_2-x/2 and Ce_1-xCa_xO_2-x Solid Solutions

W. Huang, P. Shuk, M. Greenblatt

School of Arts and Sciences, Chemistry & Chemical Biology

Research output: Contribution to journal › Article › peer-review

148 Scopus citations

Abstract

The structure, thermal expansion coefficients and ionic conductivity of Ce_1-xSm_xO_2-x/2 and Ce_1-xCa_xO_2-x (x = 0-0.30) solid electrolytes prepared hydrothermally in a relatively wide concentration range for the first time were systematically investigated. The uniformly small particle size (40-68 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 1400°C, a significantly lower temperature, compared to that at 1600°C required for samples prepared by solid-state techniques. The maximum ionic conductivity was found at x = 0.17 for the Sm and at x = 0.09 for the Ca-substituted ceria (σ_600°C = 5.7 × 10^-3 S/cm, Ea ≈ 0.9 eV, and σ_600°C = 2.1 × 10^-3 S/cm, Ea ≈ 0.8 eV, respectively). The thermal expansion coefficients, determined from high-temperature X-ray data, are 8.6 × 10^-6 and 9.4 × 10^-6 K^-1 for the best conducting Ce_0.83Sm_0.17O_1.915 and Ce_0.91Ca_0.09O_1.91 solid electrolytes, respectively.

Original language	English (US)
Pages (from-to)	2240-2245
Number of pages	6
Journal	Chemistry of Materials
Volume	9
Issue number	10
DOIs	https://doi.org/10.1021/cm970425t
State	Published - Oct 1997

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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@article{23756ed90f8b49e98d1522b093e313d8,

title = "Hydrothermal Synthesis and Properties of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x Solid Solutions",

abstract = "The structure, thermal expansion coefficients and ionic conductivity of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x (x = 0-0.30) solid electrolytes prepared hydrothermally in a relatively wide concentration range for the first time were systematically investigated. The uniformly small particle size (40-68 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 1400°C, a significantly lower temperature, compared to that at 1600°C required for samples prepared by solid-state techniques. The maximum ionic conductivity was found at x = 0.17 for the Sm and at x = 0.09 for the Ca-substituted ceria (σ600°C = 5.7 × 10-3 S/cm, Ea ≈ 0.9 eV, and σ600°C = 2.1 × 10-3 S/cm, Ea ≈ 0.8 eV, respectively). The thermal expansion coefficients, determined from high-temperature X-ray data, are 8.6 × 10-6 and 9.4 × 10-6 K-1 for the best conducting Ce0.83Sm0.17O1.915 and Ce0.91Ca0.09O1.91 solid electrolytes, respectively.",

author = "W. Huang and P. Shuk and M. Greenblatt",

year = "1997",

month = oct,

doi = "10.1021/cm970425t",

language = "English (US)",

volume = "9",

pages = "2240--2245",

journal = "Chemistry of Materials",

issn = "0897-4756",

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T1 - Hydrothermal Synthesis and Properties of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x Solid Solutions

AU - Huang, W.

AU - Shuk, P.

AU - Greenblatt, M.

PY - 1997/10

Y1 - 1997/10

N2 - The structure, thermal expansion coefficients and ionic conductivity of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x (x = 0-0.30) solid electrolytes prepared hydrothermally in a relatively wide concentration range for the first time were systematically investigated. The uniformly small particle size (40-68 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 1400°C, a significantly lower temperature, compared to that at 1600°C required for samples prepared by solid-state techniques. The maximum ionic conductivity was found at x = 0.17 for the Sm and at x = 0.09 for the Ca-substituted ceria (σ600°C = 5.7 × 10-3 S/cm, Ea ≈ 0.9 eV, and σ600°C = 2.1 × 10-3 S/cm, Ea ≈ 0.8 eV, respectively). The thermal expansion coefficients, determined from high-temperature X-ray data, are 8.6 × 10-6 and 9.4 × 10-6 K-1 for the best conducting Ce0.83Sm0.17O1.915 and Ce0.91Ca0.09O1.91 solid electrolytes, respectively.

AB - The structure, thermal expansion coefficients and ionic conductivity of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x (x = 0-0.30) solid electrolytes prepared hydrothermally in a relatively wide concentration range for the first time were systematically investigated. The uniformly small particle size (40-68 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 1400°C, a significantly lower temperature, compared to that at 1600°C required for samples prepared by solid-state techniques. The maximum ionic conductivity was found at x = 0.17 for the Sm and at x = 0.09 for the Ca-substituted ceria (σ600°C = 5.7 × 10-3 S/cm, Ea ≈ 0.9 eV, and σ600°C = 2.1 × 10-3 S/cm, Ea ≈ 0.8 eV, respectively). The thermal expansion coefficients, determined from high-temperature X-ray data, are 8.6 × 10-6 and 9.4 × 10-6 K-1 for the best conducting Ce0.83Sm0.17O1.915 and Ce0.91Ca0.09O1.91 solid electrolytes, respectively.

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Hydrothermal Synthesis and Properties of Ce_1-xSm_xO_2-x/2 and Ce_1-xCa_xO_2-x Solid Solutions

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