TY  - JOUR
AU  - Neilsen, Grace
AU  - Rosen, Peter
AU  - Dickson, Matthew
AU  - Popović, Marko
AU  - Schliesser, Jacob
AU  - Hansen, Lee
AU  - Navrotsky, Alexandra
AU  - Woodfield, Brian
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6064
AB  - It has been previously reported in the literature that the vacancy concentration in a solid can be estimated using the linear term derived from low temperature heat capacity measurements. This paper investigates how such a model performs in both random and partially clustered vacancy systems. The heat capacity measurements were used to investigate the effect of singly (Nd or Sm) doped and co-doped (Nd and Sm) ceria, where simultaneous doping affects vacancy clustering and ionic conductivity. Comparison of calculated vacancy concentrations with sample stoichiometries showed that a vacancy concentration based on the linear term in the low temperature heat capacity is quantitative for near randomly distributed vacancies at low dopant concentration, but the prediction is low by approximately an order of magnitude when vacancies become clustered at higher dopant levels. This confirms that the linear term in the low-temperature heat capacity for non-metallic materials is a viable approach to estimate the vacancy concentration for randomly distributed vacancies which, in turn, can be used to distinguish between the random versus clustered vacancies.
PB  - Elsevier
T2  - Acta Materialia
T1  - Quantifying oxygen vacancies in neodymium and samarium doped ceria from heat capacity measurements
VL  - 188
SP  - 740
EP  - 744
DO  - 10.1016/j.actamat.2020.02.055
ER  - 

@article{
author = "Neilsen, Grace and Rosen, Peter and Dickson, Matthew and Popović, Marko and Schliesser, Jacob and Hansen, Lee and Navrotsky, Alexandra and Woodfield, Brian",
year = "2020",
abstract = "It has been previously reported in the literature that the vacancy concentration in a solid can be estimated using the linear term derived from low temperature heat capacity measurements. This paper investigates how such a model performs in both random and partially clustered vacancy systems. The heat capacity measurements were used to investigate the effect of singly (Nd or Sm) doped and co-doped (Nd and Sm) ceria, where simultaneous doping affects vacancy clustering and ionic conductivity. Comparison of calculated vacancy concentrations with sample stoichiometries showed that a vacancy concentration based on the linear term in the low temperature heat capacity is quantitative for near randomly distributed vacancies at low dopant concentration, but the prediction is low by approximately an order of magnitude when vacancies become clustered at higher dopant levels. This confirms that the linear term in the low-temperature heat capacity for non-metallic materials is a viable approach to estimate the vacancy concentration for randomly distributed vacancies which, in turn, can be used to distinguish between the random versus clustered vacancies.",
publisher = "Elsevier",
journal = "Acta Materialia",
title = "Quantifying oxygen vacancies in neodymium and samarium doped ceria from heat capacity measurements",
volume = "188",
pages = "740-744",
doi = "10.1016/j.actamat.2020.02.055"
}

Neilsen, G., Rosen, P., Dickson, M., Popović, M., Schliesser, J., Hansen, L., Navrotsky, A.,& Woodfield, B.. (2020). Quantifying oxygen vacancies in neodymium and samarium doped ceria from heat capacity measurements. in Acta Materialia
Elsevier., 188, 740-744.
https://doi.org/10.1016/j.actamat.2020.02.055

Neilsen G, Rosen P, Dickson M, Popović M, Schliesser J, Hansen L, Navrotsky A, Woodfield B. Quantifying oxygen vacancies in neodymium and samarium doped ceria from heat capacity measurements. in Acta Materialia. 2020;188:740-744.
doi:10.1016/j.actamat.2020.02.055 .

Neilsen, Grace, Rosen, Peter, Dickson, Matthew, Popović, Marko, Schliesser, Jacob, Hansen, Lee, Navrotsky, Alexandra, Woodfield, Brian, "Quantifying oxygen vacancies in neodymium and samarium doped ceria from heat capacity measurements" in Acta Materialia, 188 (2020):740-744,
https://doi.org/10.1016/j.actamat.2020.02.055 . .