Effect of CaO and ZnO Additions on Density, Electrical, and Thermal Properties of Gd-Doped Ceria
The effects of CaO and ZnO as sintering aids on the electrical and thermal properties of Gd-doped CeO2 ceramics were investigated. Different systems of general formulas Gd0.1Ce0.9O1.95 and A0.02Gd0.08Ce0.9O1.94 (where A = Ca and Zn) were obtained by mechanochemistry, with a maximum milling time of 2...
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2025-06-01
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| Series: | Materials Research |
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| author | G. Martínez-De la Rosa J.A. Díaz-Guillén O.J. Durá M.E. Bazaldúa-Medellín O. Burciaga-Díaz K.P. Padmasree |
| author_facet | G. Martínez-De la Rosa J.A. Díaz-Guillén O.J. Durá M.E. Bazaldúa-Medellín O. Burciaga-Díaz K.P. Padmasree |
| author_sort | G. Martínez-De la Rosa |
| collection | DOAJ |
| description | The effects of CaO and ZnO as sintering aids on the electrical and thermal properties of Gd-doped CeO2 ceramics were investigated. Different systems of general formulas Gd0.1Ce0.9O1.95 and A0.02Gd0.08Ce0.9O1.94 (where A = Ca and Zn) were obtained by mechanochemistry, with a maximum milling time of 20 h. XRD analysis of synthesized samples revealed pure phases with a fluorite-type structure, derived from the CeO2 cubic system. Heat treatments from 800 to 1500°C enhanced crystallinity and confirmed the formation of the solid solution. SEM studies of samples sintered at 1200 and 1350°C showed similar characteristics across all systems. Both CaO and ZnO improved the materials’ relative density (~95%) at a sintering temperature of 1200 °C. Impedance spectroscopy demonstrated that the sintering aids did not have an adverse effect on ionic conductivity at 650°C, while thermal conductivity tended to decrease as the temperature increased, aligning with density results. |
| format | Article |
| id | doaj-art-14e4cd78c6664d4aa3d4dbefa763b79e |
| institution | OA Journals |
| issn | 1516-1439 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj-art-14e4cd78c6664d4aa3d4dbefa763b79e2025-08-20T02:35:36ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392025-06-012810.1590/1980-5373-mr-2025-0150Effect of CaO and ZnO Additions on Density, Electrical, and Thermal Properties of Gd-Doped CeriaG. Martínez-De la Rosahttps://orcid.org/0009-0005-7509-1933J.A. Díaz-Guillénhttps://orcid.org/0000-0003-3323-4607O.J. DuráM.E. Bazaldúa-MedellínO. Burciaga-DíazK.P. PadmasreeThe effects of CaO and ZnO as sintering aids on the electrical and thermal properties of Gd-doped CeO2 ceramics were investigated. Different systems of general formulas Gd0.1Ce0.9O1.95 and A0.02Gd0.08Ce0.9O1.94 (where A = Ca and Zn) were obtained by mechanochemistry, with a maximum milling time of 20 h. XRD analysis of synthesized samples revealed pure phases with a fluorite-type structure, derived from the CeO2 cubic system. Heat treatments from 800 to 1500°C enhanced crystallinity and confirmed the formation of the solid solution. SEM studies of samples sintered at 1200 and 1350°C showed similar characteristics across all systems. Both CaO and ZnO improved the materials’ relative density (~95%) at a sintering temperature of 1200 °C. Impedance spectroscopy demonstrated that the sintering aids did not have an adverse effect on ionic conductivity at 650°C, while thermal conductivity tended to decrease as the temperature increased, aligning with density results.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392025000100252&lng=en&tlng=enSOFCGd-doped ceriasolid electrolytesmechanochemistrysintering aidsthermal barrier coatings |
| spellingShingle | G. Martínez-De la Rosa J.A. Díaz-Guillén O.J. Durá M.E. Bazaldúa-Medellín O. Burciaga-Díaz K.P. Padmasree Effect of CaO and ZnO Additions on Density, Electrical, and Thermal Properties of Gd-Doped Ceria Materials Research SOFC Gd-doped ceria solid electrolytes mechanochemistry sintering aids thermal barrier coatings |
| title | Effect of CaO and ZnO Additions on Density, Electrical, and Thermal Properties of Gd-Doped Ceria |
| title_full | Effect of CaO and ZnO Additions on Density, Electrical, and Thermal Properties of Gd-Doped Ceria |
| title_fullStr | Effect of CaO and ZnO Additions on Density, Electrical, and Thermal Properties of Gd-Doped Ceria |
| title_full_unstemmed | Effect of CaO and ZnO Additions on Density, Electrical, and Thermal Properties of Gd-Doped Ceria |
| title_short | Effect of CaO and ZnO Additions on Density, Electrical, and Thermal Properties of Gd-Doped Ceria |
| title_sort | effect of cao and zno additions on density electrical and thermal properties of gd doped ceria |
| topic | SOFC Gd-doped ceria solid electrolytes mechanochemistry sintering aids thermal barrier coatings |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392025000100252&lng=en&tlng=en |
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