Y and La Doping in CaMnO3 Compounds: Effects of Dopant Identity and Amount on Charge Transport Kinetics
Enhancing electronic transport properties of thermoelectric oxides is of great technological importance. Oxides are promising candidates for waste heat harvesting at elevated temperatures as well as for electricity generation in low‐power applications. To this purpose, fundamental understanding of t...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley-VCH
2024-02-01
|
| Series: | Advanced Energy & Sustainability Research |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/aesr.202300191 |
| _version_ | 1797318060392054784 |
|---|---|
| author | Amram Azulay Neta Caspin Daniel Freidzon Yaron Kauffmann Holger Kleinke Yaron Amouyal |
| author_facet | Amram Azulay Neta Caspin Daniel Freidzon Yaron Kauffmann Holger Kleinke Yaron Amouyal |
| author_sort | Amram Azulay |
| collection | DOAJ |
| description | Enhancing electronic transport properties of thermoelectric oxides is of great technological importance. Oxides are promising candidates for waste heat harvesting at elevated temperatures as well as for electricity generation in low‐power applications. To this purpose, fundamental understanding of their electrical and thermal conduction mechanisms is essential. Herein, the conduction mechanism of CaMnO3 materials is focused on and how dopant identity and amount alter the kinetic properties of charge transport is investigated. Ca1−xRxMnO3 compounds with R = Y and La are synthesized, where 0 ≤ x ≤ 0.13, and the electrical conductivity and Seebeck coefficient for temperatures ranging from 300 to 1050 K, indicating that Y‐doped compounds are usually more conductive than their La‐doped counterparts, are measured. Analysis of both in terms of the small polaron hopping model reveals that Y doping reduces conduction activation energies, resulting in higher electrical conductivity and charge carrier mobility. Remarkably high values of thermoelectric power factor for the Ca0.97La0.03MnO3 compound, for example, 300 μWm−1 K−2 at 1050 K are observed; furthermore, these values are preserved for a wide temperature range, rendering this compound a good candidate for heat‐to‐electrical power generation at elevated temperatures. |
| first_indexed | 2024-03-08T03:45:00Z |
| format | Article |
| id | doaj.art-8a79b35a030642489e06b88b95ef1c55 |
| institution | Directory Open Access Journal |
| issn | 2699-9412 |
| language | English |
| last_indexed | 2024-03-08T03:45:00Z |
| publishDate | 2024-02-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Energy & Sustainability Research |
| spelling | doaj.art-8a79b35a030642489e06b88b95ef1c552024-02-09T20:11:43ZengWiley-VCHAdvanced Energy & Sustainability Research2699-94122024-02-0152n/an/a10.1002/aesr.202300191Y and La Doping in CaMnO3 Compounds: Effects of Dopant Identity and Amount on Charge Transport KineticsAmram Azulay0Neta Caspin1Daniel Freidzon2Yaron Kauffmann3Holger Kleinke4Yaron Amouyal5Department of Materials Science and Engineering Technion–Israel Institute of Technology Haifa 32000 IsraelDepartment of Materials Science and Engineering Technion–Israel Institute of Technology Haifa 32000 IsraelDepartment of Materials Science and Engineering Technion–Israel Institute of Technology Haifa 32000 IsraelDepartment of Materials Science and Engineering Technion–Israel Institute of Technology Haifa 32000 IsraelDepartment of Chemistry and Waterloo Institute for Nanotechnology University of Waterloo Waterloo Ontario N2L 3G1 CanadaDepartment of Materials Science and Engineering Technion–Israel Institute of Technology Haifa 32000 IsraelEnhancing electronic transport properties of thermoelectric oxides is of great technological importance. Oxides are promising candidates for waste heat harvesting at elevated temperatures as well as for electricity generation in low‐power applications. To this purpose, fundamental understanding of their electrical and thermal conduction mechanisms is essential. Herein, the conduction mechanism of CaMnO3 materials is focused on and how dopant identity and amount alter the kinetic properties of charge transport is investigated. Ca1−xRxMnO3 compounds with R = Y and La are synthesized, where 0 ≤ x ≤ 0.13, and the electrical conductivity and Seebeck coefficient for temperatures ranging from 300 to 1050 K, indicating that Y‐doped compounds are usually more conductive than their La‐doped counterparts, are measured. Analysis of both in terms of the small polaron hopping model reveals that Y doping reduces conduction activation energies, resulting in higher electrical conductivity and charge carrier mobility. Remarkably high values of thermoelectric power factor for the Ca0.97La0.03MnO3 compound, for example, 300 μWm−1 K−2 at 1050 K are observed; furthermore, these values are preserved for a wide temperature range, rendering this compound a good candidate for heat‐to‐electrical power generation at elevated temperatures.https://doi.org/10.1002/aesr.202300191calcium manganitecharge transportperovskitespolaronsthermoelectric oxides |
| spellingShingle | Amram Azulay Neta Caspin Daniel Freidzon Yaron Kauffmann Holger Kleinke Yaron Amouyal Y and La Doping in CaMnO3 Compounds: Effects of Dopant Identity and Amount on Charge Transport Kinetics Advanced Energy & Sustainability Research calcium manganite charge transport perovskites polarons thermoelectric oxides |
| title | Y and La Doping in CaMnO3 Compounds: Effects of Dopant Identity and Amount on Charge Transport Kinetics |
| title_full | Y and La Doping in CaMnO3 Compounds: Effects of Dopant Identity and Amount on Charge Transport Kinetics |
| title_fullStr | Y and La Doping in CaMnO3 Compounds: Effects of Dopant Identity and Amount on Charge Transport Kinetics |
| title_full_unstemmed | Y and La Doping in CaMnO3 Compounds: Effects of Dopant Identity and Amount on Charge Transport Kinetics |
| title_short | Y and La Doping in CaMnO3 Compounds: Effects of Dopant Identity and Amount on Charge Transport Kinetics |
| title_sort | y and la doping in camno3 compounds effects of dopant identity and amount on charge transport kinetics |
| topic | calcium manganite charge transport perovskites polarons thermoelectric oxides |
| url | https://doi.org/10.1002/aesr.202300191 |
| work_keys_str_mv | AT amramazulay yandladopingincamno3compoundseffectsofdopantidentityandamountonchargetransportkinetics AT netacaspin yandladopingincamno3compoundseffectsofdopantidentityandamountonchargetransportkinetics AT danielfreidzon yandladopingincamno3compoundseffectsofdopantidentityandamountonchargetransportkinetics AT yaronkauffmann yandladopingincamno3compoundseffectsofdopantidentityandamountonchargetransportkinetics AT holgerkleinke yandladopingincamno3compoundseffectsofdopantidentityandamountonchargetransportkinetics AT yaronamouyal yandladopingincamno3compoundseffectsofdopantidentityandamountonchargetransportkinetics |