Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method
Here, we demonstrate that nano–sized Mn–Ni–Co–O powder can be prepared at a low temperature via a co–precipitation method. In this work, Mn<sup>2+</sup> was partially oxidized to Mn<sup>3+</sup> ions in an aqueous solution by adding an oxidizing agent (H<sub>2</sub&g...
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/2674-0516/2/1/4 |
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| author | Duc Thang Le Jeong Ho Cho |
| author_facet | Duc Thang Le Jeong Ho Cho |
| author_sort | Duc Thang Le |
| collection | DOAJ |
| description | Here, we demonstrate that nano–sized Mn–Ni–Co–O powder can be prepared at a low temperature via a co–precipitation method. In this work, Mn<sup>2+</sup> was partially oxidized to Mn<sup>3+</sup> ions in an aqueous solution by adding an oxidizing agent (H<sub>2</sub>O<sub>2</sub>). The co-presence of Mn<sup>2+</sup> and Mn<sup>3+</sup> cations enabled the precipitated products to be well-crystallized at a calcining temperature as low as 650 °C, forming a pure cubic spinel structure. The pellets fabricated from this calcined powder showed a relative density of up to 97.1% at a moderate sintering temperature of 1100 °C. Moreover, these ceramics exhibited electrical performance suitable for use in industrial thermistors, i.e., a room temperature resistivity (<i>ρ</i><sub>25</sub>) of 1232 Ω cm, a thermistor constant (<i>B</i><sub>25/85</sub>) of 3676 K, and an aging coefficient (Δ<i>R</i>/<i>R</i>) of 1.43%. High sintering activity as well as the excellent electrical properties of the ceramics was attributed to the fine-sized particles of the synthesized powder. |
| first_indexed | 2024-03-11T05:59:29Z |
| format | Article |
| id | doaj.art-b469c37ceb794d9fa197a658b10a25bb |
| institution | Directory Open Access Journal |
| issn | 2674-0516 |
| language | English |
| last_indexed | 2024-03-11T05:59:29Z |
| publishDate | 2023-01-01 |
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| record_format | Article |
| series | Powders |
| spelling | doaj.art-b469c37ceb794d9fa197a658b10a25bb2023-11-17T13:27:57ZengMDPI AGPowders2674-05162023-01-0121475810.3390/powders2010004Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation MethodDuc Thang Le0Jeong Ho Cho1Electronic Convergence, Korea Institute of Ceramic Engineering and Technology, Jinju 660-031, Republic of KoreaElectronic Convergence, Korea Institute of Ceramic Engineering and Technology, Jinju 660-031, Republic of KoreaHere, we demonstrate that nano–sized Mn–Ni–Co–O powder can be prepared at a low temperature via a co–precipitation method. In this work, Mn<sup>2+</sup> was partially oxidized to Mn<sup>3+</sup> ions in an aqueous solution by adding an oxidizing agent (H<sub>2</sub>O<sub>2</sub>). The co-presence of Mn<sup>2+</sup> and Mn<sup>3+</sup> cations enabled the precipitated products to be well-crystallized at a calcining temperature as low as 650 °C, forming a pure cubic spinel structure. The pellets fabricated from this calcined powder showed a relative density of up to 97.1% at a moderate sintering temperature of 1100 °C. Moreover, these ceramics exhibited electrical performance suitable for use in industrial thermistors, i.e., a room temperature resistivity (<i>ρ</i><sub>25</sub>) of 1232 Ω cm, a thermistor constant (<i>B</i><sub>25/85</sub>) of 3676 K, and an aging coefficient (Δ<i>R</i>/<i>R</i>) of 1.43%. High sintering activity as well as the excellent electrical properties of the ceramics was attributed to the fine-sized particles of the synthesized powder.https://www.mdpi.com/2674-0516/2/1/4calcinationcubic spinel phaselow temperaturemanganese oxideNTCR thermistorsintering |
| spellingShingle | Duc Thang Le Jeong Ho Cho Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method Powders calcination cubic spinel phase low temperature manganese oxide NTCR thermistor sintering |
| title | Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method |
| title_full | Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method |
| title_fullStr | Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method |
| title_full_unstemmed | Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method |
| title_short | Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method |
| title_sort | nano crystalline mn ni co o thermistor powder prepared by co precipitation method |
| topic | calcination cubic spinel phase low temperature manganese oxide NTCR thermistor sintering |
| url | https://www.mdpi.com/2674-0516/2/1/4 |
| work_keys_str_mv | AT ducthangle nanocrystallinemnnicoothermistorpowderpreparedbycoprecipitationmethod AT jeonghocho nanocrystallinemnnicoothermistorpowderpreparedbycoprecipitationmethod |