Preparation and electrical properties of sintered bodies composed of Mn(2.25-X)FeXNi0.75O4 (0≦X≦2.25) with cubic spinel structure
| العنوان: | Preparation and electrical properties of sintered bodies composed of Mn(2.25-X)FeXNi0.75O4 (0≦X≦2.25) with cubic spinel structure |
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| المؤلفون: | A. Yamazaki, Daisuke Ito, Takashi Yokoyama, Takeshi Meguro, Shinji Okazaki, Y. Koshiba |
| المصدر: | Journal of Electroceramics. 37:151-157 |
| بيانات النشر: | Springer Science and Business Media LLC, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | 010302 applied physics, Materials science, Spinel, Sintering, Mineralogy, Disproportionation, 02 engineering and technology, Activation energy, engineering.material, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Polaron, 01 natural sciences, Electronic, Optical and Magnetic Materials, Ion, Crystallography, Mechanics of Materials, Electrical resistivity and conductivity, Seebeck coefficient, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, engineering, Electrical and Electronic Engineering, 0210 nano-technology |
| الوصف: | Preparation and electrical properties of sintered bodies consisting of monophase cubic spinel oxides, Mn(2.25-X)FeXNi0.75O4 (0≦X≦2.25), were investigated. Sintered bodies with monophase cubic spinel structure were prepared by heat-treatment for 48 h in air at 1000 °C and/or 1200 °C to convert them into a cubic spinel structure after sintering at 1400 °C in Ar. The relationship between ln (σ) and T −1 was expressed as straight lines for all compositions, indicating that these oxides have intrinsic NTC thermistor characteristics. Here, σ is electrical conduction. The relationship of the specimens in the region of 0≦X≦2.125 was seen to consist of two straight lines with slightly different slopes. Turning points were observed near 300 °C. It was thought that the carrier concentration changed based on the disproportionation reaction of Mn3+ in the octahedral site (B site) of the spinel structure. For specimens with X below 1.5, the electrical conduction was considered to be mainly due to an electron jump between Mn3+ and Mn4+ in the B site. For specimens with X above 1.875, the conduction was considered to be mainly due to an electron jump between Fe2+ and Fe3+ in the B site. It was found that the activation energy of the mobility between Fe ions is lower than that between Mn ions. The electrical conduction of the sintered bodies was concluded to be controlled by a small polaron hopping mechanism. |
| تدمد: | 1573-8663 1385-3449 |
| DOI: | 10.1007/s10832-016-0050-1 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::f97a3d1dbfca566d3e6c2c8ed334d752 https://doi.org/10.1007/s10832-016-0050-1 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........f97a3d1dbfca566d3e6c2c8ed334d752 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15738663 13853449 |
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| DOI: | 10.1007/s10832-016-0050-1 |