Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 900, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163528
Keywords
NTC ceramics; Composite; Ag nanoparticle; Spinel; Electrical properties
Categories
Funding
- National Natural Science Foundation of China [52002347]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [17KJB140028, 19KJB430039]
- Joint Project of Industry-University-Research of Jiangsu Province [BY2019202]
- Talent Introduction Project of Yancheng Institute of Technology [XJ201735]
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Novel Ni0.6CoMn1.4O4: x wt%Ag (NCMO: Ag-x) composite ceramics were successfully fabricated and their properties were investigated. The introduction of Ag nanoparticles improved the conductivity of the material and reduced the resistivity by decreasing grain boundary resistance and grain resistance.
In this work, novel Ni0.6CoMn1.4O4: x wt%Ag (NCMO: Ag-x, x = 0, 5, 7.5, 10, 12.5, and 15) composite ceramics were successfully fabricated by combining chemical reduction with solid-state coordination reaction method. The phase composition, microstructure, element distribution, and electrical properties are systematically investigated. The introduced Ag nanoparticles formed heterogeneous interfaces with the NCMO particles and were uniformly distributed in the samples. Due to the introduction of Ag, the Co2+ content increases from 33.2% to 50.0%. The average valence state of Mn ions increases from 2.91 to 3.17, then it decreases to 2.89. The Ag addition does facilitate the remarkable reduction of room temperature resistivity from 250.38 to 7.61 Omega cm and makes the resistivity drift below 2.57%, while B value decreases from 3145 to 1909 K, which are caused by the decreases of grain resistance and grain boundary resistance. Moreover, space electronic transmission mechanism is also proposed to further explain the positive effect of Ag introduction on electrical properties of the NCMO/Ag composite ceramics. (C) 2021 Elsevier B.V. All rights reserved.
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