Quantifying oxygen vacancies in neodymium and samarium doped ceria from heat capacity measurements
Само за регистроване кориснике
2020
Аутори
Neilsen, GraceRosen, Peter
Dickson, Matthew
Popović, Marko
Schliesser, Jacob
Hansen, Lee
Navrotsky, Alexandra
Woodfield, Brian
Чланак у часопису (Објављена верзија)
,
Acta Materialia Inc. Published by Elsevier Ltd.
Метаподаци
Приказ свих података о документуАпстракт
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.
Кључне речи:
SOFC / Vacancy clustering / Cerium oxide / Specific heat / Lattice defectsИзвор:
Acta Materialia, 2020, 188, 740-744Издавач:
- Elsevier
Финансирање / пројекти:
- U.S. Department of Energy under grant DE-SC0016446
- U.S. Department of Energy under grant DE-SC0016573
- U.S. Department of Energy under grant DE-FG02-03ER46053
Институција/група
IHTMTY - 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 . .