Oxygen migration in dense spark plasma sintered aluminum-doped neodymium silicate apatite electrolytes

Tao An; Tom Baikie; Jason Herrin; Frank Brink; J. Felix Shin; Peter R. Slater; Sean Li; Tim J. White

doi:10.1111/jace.12489

Oxygen migration in dense spark plasma sintered aluminum-doped neodymium silicate apatite electrolytes

Tao An^*, Tom Baikie, Jason Herrin, Frank Brink, J. Felix Shin, Peter R. Slater, Sean Li, Tim J. White

^*Corresponding author for this work

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

2 Citations (Scopus)

Abstract

Neodymium silicate apatites are promising intermediate temperature (500°C-700°C) electrolytes for solid oxide fuel cells. The introduction of Al promotes isotropic percolation of O^2-, and at low levels (0.83-2.0 wt% Al) enhances bulk conductivity. To better understand the effect of Al-doping on intrinsic conductivity, and the impact of grain boundaries on the transport, dense Nd_9.33+x/3Al_xSi_6-xO ₂₆ (0 ≤ x ≤ 2) pellets were prepared by spark plasma sintering. Phase purity of the products was established by powder X-ray diffraction and the microstructure examined by scanning electron microscopy. The ionic conductivity measured by AC impedance spectroscopy for the spark plasma sintered ceramics were compared with transport in single crystals of similar composition. Intermediate Al-doping (0.5 ≤ x ≤ 1.5) delivered superior overall conductivity for both the polycrystalline and single crystal specimens.

Original language	English
Pages (from-to)	3457-3462
Number of pages	6
Journal	Journal of the American Ceramic Society
Volume	96
Issue number	11
DOIs	https://doi.org/10.1111/jace.12489
Publication status	Published - Nov 2013
Externally published	Yes

ASJC Scopus Subject Areas

Ceramics and Composites
Materials Chemistry

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abstract = "Neodymium silicate apatites are promising intermediate temperature (500°C-700°C) electrolytes for solid oxide fuel cells. The introduction of Al promotes isotropic percolation of O2-, and at low levels (0.83-2.0 wt% Al) enhances bulk conductivity. To better understand the effect of Al-doping on intrinsic conductivity, and the impact of grain boundaries on the transport, dense Nd9.33+x/3AlxSi6-xO 26 (0 ≤ x ≤ 2) pellets were prepared by spark plasma sintering. Phase purity of the products was established by powder X-ray diffraction and the microstructure examined by scanning electron microscopy. The ionic conductivity measured by AC impedance spectroscopy for the spark plasma sintered ceramics were compared with transport in single crystals of similar composition. Intermediate Al-doping (0.5 ≤ x ≤ 1.5) delivered superior overall conductivity for both the polycrystalline and single crystal specimens.",

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AU - An, Tao

AU - Baikie, Tom

AU - Herrin, Jason

AU - Brink, Frank

AU - Felix Shin, J.

AU - Slater, Peter R.

AU - Li, Sean

AU - White, Tim J.

PY - 2013/11

Y1 - 2013/11

N2 - Neodymium silicate apatites are promising intermediate temperature (500°C-700°C) electrolytes for solid oxide fuel cells. The introduction of Al promotes isotropic percolation of O2-, and at low levels (0.83-2.0 wt% Al) enhances bulk conductivity. To better understand the effect of Al-doping on intrinsic conductivity, and the impact of grain boundaries on the transport, dense Nd9.33+x/3AlxSi6-xO 26 (0 ≤ x ≤ 2) pellets were prepared by spark plasma sintering. Phase purity of the products was established by powder X-ray diffraction and the microstructure examined by scanning electron microscopy. The ionic conductivity measured by AC impedance spectroscopy for the spark plasma sintered ceramics were compared with transport in single crystals of similar composition. Intermediate Al-doping (0.5 ≤ x ≤ 1.5) delivered superior overall conductivity for both the polycrystalline and single crystal specimens.

AB - Neodymium silicate apatites are promising intermediate temperature (500°C-700°C) electrolytes for solid oxide fuel cells. The introduction of Al promotes isotropic percolation of O2-, and at low levels (0.83-2.0 wt% Al) enhances bulk conductivity. To better understand the effect of Al-doping on intrinsic conductivity, and the impact of grain boundaries on the transport, dense Nd9.33+x/3AlxSi6-xO 26 (0 ≤ x ≤ 2) pellets were prepared by spark plasma sintering. Phase purity of the products was established by powder X-ray diffraction and the microstructure examined by scanning electron microscopy. The ionic conductivity measured by AC impedance spectroscopy for the spark plasma sintered ceramics were compared with transport in single crystals of similar composition. Intermediate Al-doping (0.5 ≤ x ≤ 1.5) delivered superior overall conductivity for both the polycrystalline and single crystal specimens.

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Oxygen migration in dense spark plasma sintered aluminum-doped neodymium silicate apatite electrolytes

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ASJC Scopus Subject Areas

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