Electrical conductivity &amp; temperature sensitivity of ceramics based on NiO simple oxides for NTC applications

Guo, Zehua; Shao, Junming; Lin, Huang; Jiang, Modi; Chen, Shiyuan; Li, Zhicheng

doi:10.1007/s10854-017-6995-2

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…As shown in figure 7, the real part of the AC impedance decreased as the temperature increases. This behavior is known as negative temperature coefficient (NTC) behavior [28,29]. NTC resistors, where the resistance decreases as the temperature rises, are used in various industrial and healthcare applications for temperature monitoring and control.…”

Section: Impedance Spectroscopy Measurements Of the Samplesmentioning

confidence: 99%

MWCNT induced negative real permittivity in a copolyester of Bisphenol-A with terephthalic and isophthalic acids

Özdemir

Daşdan

Kavak

et al. 2020

Mater. Res. Express

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In the present study, the negative real permittivity behavior of a copolyester of bisphenol-A with terephthalic acid and isophthalic acid (PAr) containing 1.5 to 7.5 wt% multi-walled carbon nanotubes (MWCNTs) have been investigated in detail. The structural and morphological analysis of the meltmixed composites was performed by Fourier transform infrared spectroscopy using attenuated total reflection (FTIR-ATR), atomic force microscopy (AFM), x-ray diffraction (XRD), and light microscopy. The influences of the MWCNT filler on the AC impedance, complex permittivity, and AC conductivity of the PAr polymer matrix were investigated at different operating temperatures varied between 296 K and 373 K. The transition from a negative to positive real permittivity was observed at different crossover frequencies depending on the MWCNT content of the composites whereas pure PAr showed positive values at all frequencies. The negative real permittivity characteristic of the composites was discussed in the context of Drude model.

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Section: Impedance Spectroscopy Measurements Of the Samplesmentioning

confidence: 99%

MWCNT induced negative real permittivity in a copolyester of Bisphenol-A with terephthalic and isophthalic acids

Özdemir

Daşdan

Kavak

et al. 2020

Mater. Res. Express

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“…Al 3+ ion acts as a donor in CuO crystal, in which the weakly bound electrons can be thermally activated to jump to the conduction band and provide electronic conduction. Element doping can effectively regulate the conductivity of a semiconductor material and there is an optimized dopant content for a certain material [12][13][14][15][16][17][18]. As shown in Fig.…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…To a specific NTC thermistor system, it should be of practical application value to achieve both adjustable ρ 25 and appropriate B values by element doping. Ceramics based on single oxides such as SnO 2 , NiO, CuO and vanadium oxides were studied due to their excellent NTC characteristics, and both ρ 25 and B value can be effectively adjusted by oxide doping and element substitution [12][13][14][15][16][17][18]. Copper oxide (CuO), a semiconducting material with a band gap of about 1.4 eV, is one of the widely used materials because of its unique electrical conductivity, optical/catalytic properties, chemical stability and low cost [19].…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Wang

Yan

et al. 2020

PAC

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Nb/Al-modified CuO ceramics (yNb/0.02Al-CuO, 0 ≤ y ≤ 0.07, denoted as NACO) were synthesized using sol-gel method for applications in negative temperature coefficient (NTC) thermistors. The phase structure, microstructure and electrical properties of the ceramics were investigated. XRD investigation reveals that the NACO ceramics has the main phase with monoclinic crystalline structure. The analysis of X-ray photoelectron spectroscopy proved the existence of Cu 2+ /Cu + and Nb 5+ /Nb 4+ ions. Temperature dependence of the resistivity indicated that the NACO ceramics present typical NTC characteristic. The NTC materials' constant, B value, can be adjusted from 2430 K to 3805 K by changing the Nb-concentration in the Al-doped CuO ceramics. Among four applied calibration equations the Hoge-3 equation is the most effective one for the resistancetemperature calibration of the prepared NTC thermistors. The complex impedance analysis was performed and revealed that both grain effect and grain boundary effect similarly contribute to the electrical conductive behaviour and NTC feature of the NACO ceramics. The band conduction and polaron hopping conduction are proposed as the conduction mechanisms in the NACO thermistors.

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“…Nickel oxide (NiO) is a typical semiconducting compound with band gap of about 3.6 eV. NiO has received great interest for applications in lithium ion battery, supercapacitor, solar cell, fuek cell and gas sensor, etc …”

Section: Introductionmentioning

confidence: 99%

Electrical properties of Y/Mg modified NiO simple oxides for negative temperature coefficient thermistors

Xiang

et al. 2018

Int J Applied Ceramic Tech

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The semiconductors based on simple oxide have unique features with controllable electrical property by element doping. Y3+ doped NiO (Ni1−xYxO, x ≤ 0.01) and Mg2+ substituted Ni0.995Y0.005O (Ni0.995−yY0.005MgyO, y ≤ 0.5) powders were synthesized by a wet chemical method. The related ceramics were obtained by conventional ceramic processing. Phase component, microstructure, electrical property and temperature sensitivity of the prepared ceramics were investigated. All ceramics have a rock‐salt type crystalline structure. The room‐temperature resistivity of the ceramics can be widely adjusted from 254 to 12 322 Ω·cm by changing the concentrations of Y3+ and Mg2+ ions. The samples show typical characteristics of negative temperature coefficient of resistivity and have high temperature sensitivity with material constants higher than 4745 K. The analysis of impedance spectra indicates that the electrical properties resulted from both grain effect and grain boundary effect. Both band conduction and small polaron hopping were proposed as possible conduction mechanisms in the studied ceramics.

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Electrical conductivity & temperature sensitivity of ceramics based on NiO simple oxides for NTC applications

Cited by 13 publications

References 20 publications

MWCNT induced negative real permittivity in a copolyester of Bisphenol-A with terephthalic and isophthalic acids

MWCNT induced negative real permittivity in a copolyester of Bisphenol-A with terephthalic and isophthalic acids

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Electrical properties of Y/Mg modified NiO simple oxides for negative temperature coefficient thermistors

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