Mixed Electrical Conduction of Calcium Aluminates Synthesized by Polymeric Precursors
A study of the electrical transport properties of calcium aluminate (CA) with coexisting C3A and C12A7 phases was carried out. In this work, powders resulting from synthesis based on the polymer precursor method. The resulting product was characterized by means of XRD, Raman, and UV-visible analysis...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/pdf/mr/v22n1/1516-1439-mr-22-01-e20180271.pdf |
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| author | Faili Cintia Tomsen Veiga Ricardo Fernández González José Jurado Egea Sergio da Silva Cava Vânia Caldas de Sousa |
| author_facet | Faili Cintia Tomsen Veiga Ricardo Fernández González José Jurado Egea Sergio da Silva Cava Vânia Caldas de Sousa |
| author_sort | Faili Cintia Tomsen Veiga |
| collection | DOAJ |
| description | A study of the electrical transport properties of calcium aluminate (CA) with coexisting C3A and C12A7 phases was carried out. In this work, powders resulting from synthesis based on the polymer precursor method. The resulting product was characterized by means of XRD, Raman, and UV-visible analysis to obtain the optical BG and by EIS. From the XRD and Raman analyses, the presence and coexistence of the two self-modified phases were confirmed. In this biphasic composition, celite phase was estimated to be the major phase. An optical BG of 5.69 eV at room temperature was calculated, and under the condition of a reducing atmosphere in the temperature range of 750-950 ºC, an activation energy for conduction of 2.98 eV was determined by EIS measurements. Further, in this biphasic sample, the electronic conduction transport might be governed by the mayenite minor phase due to its large defect nature and concentration compared to celite. In oxidizing conditions, the activation energy for electrical conduction was 1.42 eV, which is somewhat higher than that observed by other authors in mayenite single phase; this result was explained by taking into account the coexistence of biphasic material and an actual chemical defect scenario in SMCM is discussed. |
| first_indexed | 2024-12-22T22:04:42Z |
| format | Article |
| id | doaj.art-69108d84a2ff4bc0acd9e281958f8e11 |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-12-22T22:04:42Z |
| 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-69108d84a2ff4bc0acd9e281958f8e112022-12-21T18:11:01ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-143910.1590/1980-5373-mr-2018-0271Mixed Electrical Conduction of Calcium Aluminates Synthesized by Polymeric PrecursorsFaili Cintia Tomsen VeigaRicardo Fernández GonzálezJosé Jurado EgeaSergio da Silva CavaVânia Caldas de SousaA study of the electrical transport properties of calcium aluminate (CA) with coexisting C3A and C12A7 phases was carried out. In this work, powders resulting from synthesis based on the polymer precursor method. The resulting product was characterized by means of XRD, Raman, and UV-visible analysis to obtain the optical BG and by EIS. From the XRD and Raman analyses, the presence and coexistence of the two self-modified phases were confirmed. In this biphasic composition, celite phase was estimated to be the major phase. An optical BG of 5.69 eV at room temperature was calculated, and under the condition of a reducing atmosphere in the temperature range of 750-950 ºC, an activation energy for conduction of 2.98 eV was determined by EIS measurements. Further, in this biphasic sample, the electronic conduction transport might be governed by the mayenite minor phase due to its large defect nature and concentration compared to celite. In oxidizing conditions, the activation energy for electrical conduction was 1.42 eV, which is somewhat higher than that observed by other authors in mayenite single phase; this result was explained by taking into account the coexistence of biphasic material and an actual chemical defect scenario in SMCM is discussed.http://www.scielo.br/pdf/mr/v22n1/1516-1439-mr-22-01-e20180271.pdfCalcium aluminatePolymer precursorChemical defectElectrochemical Impedance SpectroscopySelf-modified celite and mayenite biphasic composition |
| spellingShingle | Faili Cintia Tomsen Veiga Ricardo Fernández González José Jurado Egea Sergio da Silva Cava Vânia Caldas de Sousa Mixed Electrical Conduction of Calcium Aluminates Synthesized by Polymeric Precursors Materials Research Calcium aluminate Polymer precursor Chemical defect Electrochemical Impedance Spectroscopy Self-modified celite and mayenite biphasic composition |
| title | Mixed Electrical Conduction of Calcium Aluminates Synthesized by Polymeric Precursors |
| title_full | Mixed Electrical Conduction of Calcium Aluminates Synthesized by Polymeric Precursors |
| title_fullStr | Mixed Electrical Conduction of Calcium Aluminates Synthesized by Polymeric Precursors |
| title_full_unstemmed | Mixed Electrical Conduction of Calcium Aluminates Synthesized by Polymeric Precursors |
| title_short | Mixed Electrical Conduction of Calcium Aluminates Synthesized by Polymeric Precursors |
| title_sort | mixed electrical conduction of calcium aluminates synthesized by polymeric precursors |
| topic | Calcium aluminate Polymer precursor Chemical defect Electrochemical Impedance Spectroscopy Self-modified celite and mayenite biphasic composition |
| url | http://www.scielo.br/pdf/mr/v22n1/1516-1439-mr-22-01-e20180271.pdf |
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