Electrical properties and temperature sensitivity of Li/Mg modified Ni0.7Zn0.3O based ceramics

Sun, Xiang; Leng, Senlin; Zhang, Hong; He, Zhenli; Li, Zhicheng

doi:10.1016/j.jallcom.2018.05.210

Cited by 25 publications

(7 citation statements)

References 34 publications

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“…On the other hand, because Mg 2+ ions have partially substituted for Ni 2+ ions in the samples, there must be fewer contents of Ni 2+ ions in these compounds, comparing with the unsubstituted compound of Ni 0.995 Y 0.005 O. Because the stronger Mg–O bond than that of Ni–O bonds, it should be more difficult for the formation of oxygen vacancy at the Mg–O bonding sites. Therefore, the introduction of Mg 2+ ions into the NiO‐based ceramics might reduce the formation possibility of ionic vacancies in the same ceramic process and slightly increased the lattice parameters with the increase of Mg 2+ ‐ion concentration.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…12. The activation of the fit shows that the conductance activation energy of the grains and grain boundaries is much lower than the long-range mobility activation energy of the oxygen vacancies, so the conductance of the grains and grain boundaries is caused by electron hopping [29]. Understanding the conductive mechanism inside the NTC material will greatly help the application of NTC thin film.…”

Section: Complex Impedance Spectrummentioning

confidence: 99%

Mn-Co-Ni-O thin films prepared by sputtering with alloy target

Zou

et al. 2020

J Adv Ceram

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The thin film of heat-sensitive materials has been widely concerned with the current trend of miniaturization and integration of sensors. In this work, Mn 1.56 Co 0.96 Ni 0.48 O 4 (MCNO) thin films were prepared on SiO 2 /Si substrates by sputtering with Mn-Co-Ni alloy target and then annealing in air at different temperatures (650-900 ℃). The X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) analysis indicated that the main crystalline phase of MCNO thin films was spinel crystal structure; the surface of the thin films was very dense and uniform. The electrical properties of the thin films were studied in the temperature range of-5-50 ℃. The MCNO thin film with a low room temperature resistance R 25 of 71.1 kΩ and a high thermosensitive constant B value of 3305 K was obtained at 750 ℃. X-ray photoelectron spectroscopy (XPS) analysis showed that the concentration of Mn 3+ and Mn 4+ cations in MCNO thin films is the highest when annealing temperature is 750 ℃. The complex impedance analysis revealed internal conduction mechanism of the MCNO thin film and the resistance of the thin film was dominated by grain boundary resistance.

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“…The conductance of the grains and grain boundaries is caused by hole carries hopping. It could be explained by the activation energy, because the activation energy of the grains and grain boundaries is lower than the activation energy of oxygen vacancies [47,48]. Combining with the IS analysis, the conductive mechanism for NTC ceramic would improve the application for industry thermistors.…”

Section: Electrical Characterization Xps and Complex Impedance Analysismentioning

confidence: 99%

Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

Zhang

Thayil

et al. 2020

Preprint

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Herein, the Mn1.95-xCo0.21Ni0.84SrxO4 (MCNS) (0 ≤ x ≤ 0.15) based negative temperature coefficient (NTC) materials are prepared by co-precipitation method. The replacement of Mn by Sr plays a critical role in controlling the lattice parameter, relative density, microstructure and electrical properties. The lattice parameter and relative density increase with the increase of Sr content. A small amount of Sr restrains the grain growth and increases the bulk density. Moreover, the ρ25, B25/50, Ea and α values of MCNS ceramics are influenced by the Sr content and ranged from 1535.0-2053.6 Ω·cm, 3654-3709 K, 0.3149-0.3197 eV and -4.111--4.173%, respectively. The XPS results explain the transformation of MCNS ceramics from n- to p-type semiconductors. The conduction could arise from the hopping polaron between Mn3+/Mn4+ and Co2+/Co3+ in the octahedral sites. The impedance data analysis also discussed the conduction mechanism of the MCNS ceramic, while grain resistance dominates the whole resistance of the samples. Furthermore, the aging coefficient (△R/R) of MCNS ceramics is found to be < 0.2%, which indicates the stable distribution of cations in the spinel. Finally, the MCNS ceramics demonstrate excellent thermal durability with <1.3% of resistance shift after 100 thermal shock cycles.

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Electrical properties and temperature sensitivity of Li/Mg modified Ni0.7Zn0.3O based ceramics

Cited by 25 publications

References 34 publications

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

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

Mn-Co-Ni-O thin films prepared by sputtering with alloy target

Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

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