Low-temperature impedance spectroscopic analyses of ceramic electrodes based on Mo and Co co-doped SnO2
| Autor: | Diego H.O. Ferreira, Isabela C.F. Vaz, Rero M. Rubinger, Camila Buono, Leandro S.R. Rocha, Miguel A. Ponce, Elson Longo, Alexandre Z. Simões, Francisco Moura |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Processing and Application of Ceramics, Vol 13, Iss 4, Pp 360-367 (2019) |
| Druh dokumentu: | article |
| ISSN: | 1820-6131 2406-1034 |
| DOI: | 10.2298/PAC1904360F |
| Popis: | Low resistive electrodes based on Co and Mo co-doped SnO2 were prepared by the conventional solid-state reaction and sintered at 1250 °C for 2 h. Concentration of Co2O3 precursor was unchanged (1 mol%), while MoO3 was varied (0.25, 0.50 to 0.75 mol%) to promote conductivity. The structural and microstructural characterization revealed that the samples have a rutile-type structure without secondary phases and large rutile grains with low porosity. Electrical measurements on DC mode have shown a semiconductor behaviour of the SnO2 samples doped with 0.25 and 0.75 at.% of Mo at temperatures below 50 K, indicating their suitability for low-temperature electronic applications. Impedance measurements indicate reduced energy barriers of less than 1 meV formed between highly conductive crystallites for the SnO2 samples doped with 0.25 and 0.75 at.% of Mo. The sample with Mo content of 0.50 at.% presented a higher energy barrier at a few hundredths of eV, with space charges at the crystallite boundaries. |
| Databáze: | Directory of Open Access Journals |
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