The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Martin Kilo - One of the best experts on this subject based on the ideXlab platform.
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correlation between Ionic Radius and cation diffusion in stabilised zirconia
Solid State Ionics, 2004Co-Authors: M A Taylor, Chr Argirusis, Martin Kilo, Gunter Borchardt, K D Luther, W AssmusAbstract:Abstract To get an insight into the mechanism of cation diffusion in stabilized zirconia, the diffusion of all stable lanthanides was measured simultaneously in zirconia stabilised with scandia (ScSZ), yttria (YSZ) and calcia (CSZ). It was possible to identify all lanthanides with SIMS and to obtain the bulk diffusion coefficients between 1400 and 2000 K from SIMS depth profiles. For CSZ and YSZ, the lanthanide bulk diffusivities increase with increasing lanthanide Ionic Radius, while for ScSZ, they are nearly independent of the Radius. The experimental activation enthalpies and pre-exponential factors are highest for two-valent CSZ and lower for the three-valent systems ScSZ and YSZ. They are not strongly affected by the type of the lanthanide for all systems investigated.
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lanthanide transport in stabilized zirconias interrelation between Ionic Radius and diffusion coefficient
Journal of Chemical Physics, 2004Co-Authors: Martin Kilo, M A Taylor, Chr Argirusis, Gunter Borchardt, Sylvain Weber, Hubert Scherrer, R A JacksonAbstract:The diffusion of all stable lanthanides was measured both in calcia stabilized zirconia (CSZ) and in yttria stabilized zirconia (YSZ) in the temperature range between 1286 and 1600 °C. The lanthanide diffusion coefficients obtained increase with increasing Ionic Radius. The experimental activation enthalpy of diffusion is near 6 eV for CSZ and between 4 and 5 eV for YSZ and is not strongly affected by the type of lanthanide. The results were correlated with defect energy calculations of the lanthanide diffusion enthalpy using the Mott-Littleton approach. An association enthalpy of cation vacancies with oxygen vacancies of about 1 eV (96 kJ/mol) was deduced in the case of CSZ, while there is no association in the case of YSZ. Furthermore, the change in diffusion coefficients can be correlated to the interaction parameter for the interaction between the lanthanide oxide with zirconia: The higher the interaction parameter, the higher the lanthanide diffusion coefficient.
R A Jackson - One of the best experts on this subject based on the ideXlab platform.
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lanthanide transport in stabilized zirconias interrelation between Ionic Radius and diffusion coefficient
Journal of Chemical Physics, 2004Co-Authors: Martin Kilo, M A Taylor, Chr Argirusis, Gunter Borchardt, Sylvain Weber, Hubert Scherrer, R A JacksonAbstract:The diffusion of all stable lanthanides was measured both in calcia stabilized zirconia (CSZ) and in yttria stabilized zirconia (YSZ) in the temperature range between 1286 and 1600 °C. The lanthanide diffusion coefficients obtained increase with increasing Ionic Radius. The experimental activation enthalpy of diffusion is near 6 eV for CSZ and between 4 and 5 eV for YSZ and is not strongly affected by the type of lanthanide. The results were correlated with defect energy calculations of the lanthanide diffusion enthalpy using the Mott-Littleton approach. An association enthalpy of cation vacancies with oxygen vacancies of about 1 eV (96 kJ/mol) was deduced in the case of CSZ, while there is no association in the case of YSZ. Furthermore, the change in diffusion coefficients can be correlated to the interaction parameter for the interaction between the lanthanide oxide with zirconia: The higher the interaction parameter, the higher the lanthanide diffusion coefficient.
M A Taylor - One of the best experts on this subject based on the ideXlab platform.
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correlation between Ionic Radius and cation diffusion in stabilised zirconia
Solid State Ionics, 2004Co-Authors: M A Taylor, Chr Argirusis, Martin Kilo, Gunter Borchardt, K D Luther, W AssmusAbstract:Abstract To get an insight into the mechanism of cation diffusion in stabilized zirconia, the diffusion of all stable lanthanides was measured simultaneously in zirconia stabilised with scandia (ScSZ), yttria (YSZ) and calcia (CSZ). It was possible to identify all lanthanides with SIMS and to obtain the bulk diffusion coefficients between 1400 and 2000 K from SIMS depth profiles. For CSZ and YSZ, the lanthanide bulk diffusivities increase with increasing lanthanide Ionic Radius, while for ScSZ, they are nearly independent of the Radius. The experimental activation enthalpies and pre-exponential factors are highest for two-valent CSZ and lower for the three-valent systems ScSZ and YSZ. They are not strongly affected by the type of the lanthanide for all systems investigated.
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lanthanide transport in stabilized zirconias interrelation between Ionic Radius and diffusion coefficient
Journal of Chemical Physics, 2004Co-Authors: Martin Kilo, M A Taylor, Chr Argirusis, Gunter Borchardt, Sylvain Weber, Hubert Scherrer, R A JacksonAbstract:The diffusion of all stable lanthanides was measured both in calcia stabilized zirconia (CSZ) and in yttria stabilized zirconia (YSZ) in the temperature range between 1286 and 1600 °C. The lanthanide diffusion coefficients obtained increase with increasing Ionic Radius. The experimental activation enthalpy of diffusion is near 6 eV for CSZ and between 4 and 5 eV for YSZ and is not strongly affected by the type of lanthanide. The results were correlated with defect energy calculations of the lanthanide diffusion enthalpy using the Mott-Littleton approach. An association enthalpy of cation vacancies with oxygen vacancies of about 1 eV (96 kJ/mol) was deduced in the case of CSZ, while there is no association in the case of YSZ. Furthermore, the change in diffusion coefficients can be correlated to the interaction parameter for the interaction between the lanthanide oxide with zirconia: The higher the interaction parameter, the higher the lanthanide diffusion coefficient.
Chr Argirusis - One of the best experts on this subject based on the ideXlab platform.
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correlation between Ionic Radius and cation diffusion in stabilised zirconia
Solid State Ionics, 2004Co-Authors: M A Taylor, Chr Argirusis, Martin Kilo, Gunter Borchardt, K D Luther, W AssmusAbstract:Abstract To get an insight into the mechanism of cation diffusion in stabilized zirconia, the diffusion of all stable lanthanides was measured simultaneously in zirconia stabilised with scandia (ScSZ), yttria (YSZ) and calcia (CSZ). It was possible to identify all lanthanides with SIMS and to obtain the bulk diffusion coefficients between 1400 and 2000 K from SIMS depth profiles. For CSZ and YSZ, the lanthanide bulk diffusivities increase with increasing lanthanide Ionic Radius, while for ScSZ, they are nearly independent of the Radius. The experimental activation enthalpies and pre-exponential factors are highest for two-valent CSZ and lower for the three-valent systems ScSZ and YSZ. They are not strongly affected by the type of the lanthanide for all systems investigated.
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lanthanide transport in stabilized zirconias interrelation between Ionic Radius and diffusion coefficient
Journal of Chemical Physics, 2004Co-Authors: Martin Kilo, M A Taylor, Chr Argirusis, Gunter Borchardt, Sylvain Weber, Hubert Scherrer, R A JacksonAbstract:The diffusion of all stable lanthanides was measured both in calcia stabilized zirconia (CSZ) and in yttria stabilized zirconia (YSZ) in the temperature range between 1286 and 1600 °C. The lanthanide diffusion coefficients obtained increase with increasing Ionic Radius. The experimental activation enthalpy of diffusion is near 6 eV for CSZ and between 4 and 5 eV for YSZ and is not strongly affected by the type of lanthanide. The results were correlated with defect energy calculations of the lanthanide diffusion enthalpy using the Mott-Littleton approach. An association enthalpy of cation vacancies with oxygen vacancies of about 1 eV (96 kJ/mol) was deduced in the case of CSZ, while there is no association in the case of YSZ. Furthermore, the change in diffusion coefficients can be correlated to the interaction parameter for the interaction between the lanthanide oxide with zirconia: The higher the interaction parameter, the higher the lanthanide diffusion coefficient.
Gunter Borchardt - One of the best experts on this subject based on the ideXlab platform.
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correlation between Ionic Radius and cation diffusion in stabilised zirconia
Solid State Ionics, 2004Co-Authors: M A Taylor, Chr Argirusis, Martin Kilo, Gunter Borchardt, K D Luther, W AssmusAbstract:Abstract To get an insight into the mechanism of cation diffusion in stabilized zirconia, the diffusion of all stable lanthanides was measured simultaneously in zirconia stabilised with scandia (ScSZ), yttria (YSZ) and calcia (CSZ). It was possible to identify all lanthanides with SIMS and to obtain the bulk diffusion coefficients between 1400 and 2000 K from SIMS depth profiles. For CSZ and YSZ, the lanthanide bulk diffusivities increase with increasing lanthanide Ionic Radius, while for ScSZ, they are nearly independent of the Radius. The experimental activation enthalpies and pre-exponential factors are highest for two-valent CSZ and lower for the three-valent systems ScSZ and YSZ. They are not strongly affected by the type of the lanthanide for all systems investigated.
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lanthanide transport in stabilized zirconias interrelation between Ionic Radius and diffusion coefficient
Journal of Chemical Physics, 2004Co-Authors: Martin Kilo, M A Taylor, Chr Argirusis, Gunter Borchardt, Sylvain Weber, Hubert Scherrer, R A JacksonAbstract:The diffusion of all stable lanthanides was measured both in calcia stabilized zirconia (CSZ) and in yttria stabilized zirconia (YSZ) in the temperature range between 1286 and 1600 °C. The lanthanide diffusion coefficients obtained increase with increasing Ionic Radius. The experimental activation enthalpy of diffusion is near 6 eV for CSZ and between 4 and 5 eV for YSZ and is not strongly affected by the type of lanthanide. The results were correlated with defect energy calculations of the lanthanide diffusion enthalpy using the Mott-Littleton approach. An association enthalpy of cation vacancies with oxygen vacancies of about 1 eV (96 kJ/mol) was deduced in the case of CSZ, while there is no association in the case of YSZ. Furthermore, the change in diffusion coefficients can be correlated to the interaction parameter for the interaction between the lanthanide oxide with zirconia: The higher the interaction parameter, the higher the lanthanide diffusion coefficient.
