Solution Synthesis of Cubic Spinel Mn-Ni-Cu-O Thermistor Powder
- Authors
- Le, Duc Thang; Ju, Heongkyu
- Issue Date
- Mar-2021
- Publisher
- MDPI
- Keywords
- Co-precipitation; Cubic spinel; Nanoparticle; Nickel manganite; Sintering; Thermistor
- Citation
- Materials, v.14, no.6
- Journal Title
- Materials
- Volume
- 14
- Number
- 6
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80877
- DOI
- 10.3390/ma14061389
- ISSN
- 1996-1944
- Abstract
- Toward the development of NTCR thermistors, nanocrystalline Mn–Ni–Cu–O powder was synthesized from a mixed chloride aqueous solution by a simple co-precipitation method.The introduction of an oxidizing agent (H2O2) into the solution led to the partial oxidation of Mn2+ ions into Mn3+ ions, which enabled the collected powder to be well crystallized at 650 °C. Such a low calcining temperature resulted in fine particles with a mean size of 60 nm, which significantly promoted densification of the resulting ceramics. As a result, a dense and homogenous microstructure with a relative density up to 97.2% was achieved for pellets sintered at 1100 °C. Furthermore, these sintered ceramics exhibited a room temperature resistivity (ρ25) of 67 Ω·cmand a thermistor constant (B25/85) of 2843 K, which make them suitable for use in industrial thermistors. In addition, electrical stability was greatly improved when the ceramics were prepared by a new two-step sintering method. The results suggest that the co-precipitation route with the introduction of H2O2 is suitable for the fabrication of cubic spinel thermistor nanopowders. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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