The effect of Zn on the microstructure and electrical properties of Mn1.17−xNi0.93Co0.9ZnxO4 (0≤x≤0.075) NTC thermistors

Park, K.; Lee, J.K.; Kim, S.-J.; Seo, Won Seon; Cho, W.-S.; Lee, C.-W.; Nahm, Sahn

doi:10.1016/j.jallcom.2007.11.105

Cited by 59 publications

(21 citation statements)

References 22 publications

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“…1b, NiO was detected when the calcination temperature was higher than 850°C. This indicates the onset of spinel decomposition with associated release of oxygen and NiO phase segregation [29][30][31]:…”

Section: Resultsmentioning

confidence: 98%

Preparation and characterization of NiMn2O4 negative temperature coefficient ceramics by solid-state coordination reaction

Gao

Sun³

2014

J Mater Sci: Mater Electron

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The influence of synthesis parameters, such as calcination temperature and sintering temperature, on the microstructure, phase composition, and electrical properties of NiMn 2 O 4 negative temperature coefficient (NTC) ceramics was systematically investigated. The NiMn 2 O 4 NTC ceramics were synthesized via solid-state coordination reaction. With increasing sintering temperatures, the relative density increased, whereas the porosity decreased. Single-phase, cubic spinel ceramic was obtained following sintering at 900 and 1,050°C, whereas a secondary phase, i.e., NiO, was detected when the sintering temperature was higher than 1,100°C. High-density ceramics were obtained when the sintering temperature was higher than 1,100°C, and featured the lowest room temperature resistivity of 2,924 X cm and thermal constant B of 3,429 K. The latter parameter reflects the temperature sensitivity of the NTC ceramics. Variations of the electrical property were because of increases in density and onset of decomposition.

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Section: Resultsmentioning

confidence: 98%

Preparation and characterization of NiMn2O4 negative temperature coefficient ceramics by solid-state coordination reaction

Gao

Sun³

2014

J Mater Sci: Mater Electron

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“…However, the doping of Cu will cause a harmful consequence, i.e., the resistivity drift rate is 14.9% after ageing at 150 ℃ for 500 h in air [9]. For improving the ageing characteristic, much work has been done by cation doping and microstructure modification [9][10][11]. For instance, Ma et al [12] reported that the resistivity drift for Ni 0.…”

Section: +mentioning

confidence: 99%

Characterization of new negative temperature coefficient thermistors based on Zn–Ni–O system

Sun

Zhang

et al. 2016

J Adv Ceram

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Y 2 O 3 -doped Zn 1x Ni x O (x = 0, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.9) powders were prepared by a wet chemical synthesis method, and the related ceramics were obtained by the traditional ceramic sintering technology. The phases and related electrical properties of the ceramics were investigated. The analysis of X-ray diffraction (XRD) indicates that the prepared ceramics with Ni substitution have a cubic crystalline structure. The resistance-temperature feature indicates that all the ceramics show a typical effect of negative temperature coefficient (NTC) of resistivity with the thermal constants between 3998 and 5464 K, and have high cyclical stability in a temperature range from 25 to 300 ℃. The impedance analysis reveals that both grain effect and grain boundary effect contribute collectively to the NTC effect. The electron hopping and band conduction models are proposed for the grain (bulk) conduction, and the thermally activated charge carrier transport overcoming the energy barrier is suggested for the grain boundary conduction.

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“…For the purpose of detecting if any cubic spinel Ni-rich phase was present in spinel, as suggested by Park et al [21], the 2u ranged from 558 to 648 was set to give a distinguishing of them. The XRD patterns are shown in Fig.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

An efficient way to improve the electrical stability of Ni0.6Si0.2Al0.6Mn1.6O4 NTC thermistor

Yang

Zhang

et al. 2011

Ceramics International

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The effect of Zn on the microstructure and electrical properties of Mn1.17−xNi0.93Co0.9ZnxO4 (0≤x≤0.075) NTC thermistors

Cited by 59 publications

References 22 publications

Preparation and characterization of NiMn2O4 negative temperature coefficient ceramics by solid-state coordination reaction

Preparation and characterization of NiMn2O4 negative temperature coefficient ceramics by solid-state coordination reaction

Characterization of new negative temperature coefficient thermistors based on Zn–Ni–O system

An efficient way to improve the electrical stability of Ni0.6Si0.2Al0.6Mn1.6O4 NTC thermistor

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