Effect of Zn/Fe co-doping on the microstructure, electrical properties and aging behavior of Co–Mn–Ni–O NTC ceramics

Rong, Jinghao; Zhang, Huimin; Zhao, Pengjun; Qin, Qing; He, Donglin; Xie, Juntao; Ding, Yuning; Jiang, Hui; Wu, Bin; Chang, Aimin

doi:10.1007/s00339-022-05585-y

Cited by 8 publications

(2 citation statements)

References 35 publications

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“…This means that no phase transformation and/or segregation took place during sintering. Therefore, it is worth noting that the sintering at such a low temperature (1100 • C) prevents decomposition reactions (into rock salt NiO phase), that are commonly observed at high temperatures [13,17,26,35]. These are consistent with the previous results [12,15,23], which indicate that the formation of the secondary phase can be suppressed by sintering at a low temperature.…”

Section: Sample Nosupporting

confidence: 90%

Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method

Cho

2023

Powders

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Here, we demonstrate that nano–sized Mn–Ni–Co–O powder can be prepared at a low temperature via a co–precipitation method. In this work, Mn2+ was partially oxidized to Mn3+ ions in an aqueous solution by adding an oxidizing agent (H2O2). The co-presence of Mn2+ and Mn3+ cations enabled the precipitated products to be well-crystallized at a calcining temperature as low as 650 °C, forming a pure cubic spinel structure. The pellets fabricated from this calcined powder showed a relative density of up to 97.1% at a moderate sintering temperature of 1100 °C. Moreover, these ceramics exhibited electrical performance suitable for use in industrial thermistors, i.e., a room temperature resistivity (ρ25) of 1232 Ω cm, a thermistor constant (B25/85) of 3676 K, and an aging coefficient (ΔR/R) of 1.43%. High sintering activity as well as the excellent electrical properties of the ceramics was attributed to the fine-sized particles of the synthesized powder.

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Section: Sample Nosupporting

confidence: 90%

Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method

Cho

2023

Powders

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“…Current research studies on NTC thermistors are mainly focused on the introduction of Cu 2+ , Na + , Mn 3+ , Zn 2+ , or Fe 3+ ions into their structures to increase the B value and reduce the resistivity of the NTC material. − The NTC materials in these studies are mostly ceramic materials, which include spinel-type oxides and perovskite-type oxides. Although they have excellent thermal stabilities, such materials require high reaction temperatures and/or high pressures, which make their synthesis consume more time and high energy. , Further, the fabrication of inorganic NTC thin films is complicated and the fabricated thin films lack flexibility .…”

Section: Introductionmentioning

confidence: 99%

Water-Stable Hybrid Lead-Free Perovskite for Negative Temperature Coefficient Thermistors

Wang

et al. 2023

Inorg. Chem.

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Negative temperature coefficient (NTC) thermistors feature higher sensitivities and faster response speeds and thereby have particular applications in many fields. However, current NTC thermistors are mostly based on inorganic ceramic materials, which show obvious drawbacks in material synthesis, property modulation, and flexible film fabrication. Herein, we report, for the first time, the promising application of an inorganic–organic hybrid NTC thermistor. A new lead-free hybrid iodo bismuthate [1,1′,1″-(benzene-1,3,5-triyl)tris(3-methyl-1H-imidazol-3-ium)]Bi2I9 [denoted as (Me3TMP)Bi2I9 ] was synthesized by a “double-free” strategy. (Me3TMP)Bi2I9 features a lead-free binuclear bismuth iodine anion charge compensated by a “classic hydrogen-bond-free” cation. (Me3TMP)Bi2I9 exhibits remarkable stability in water and UV light irradiation and shows the largest temperature sensitivity coefficient among all reported NTC materials. Theoretical calculation and detailed structural analysis disclose that the seriously distorted (BiI6) octahedra are responsible for the intriguing NTC effect for (Me3TMP)Bi2I9 .

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Aging improvement in Ho-doped NTC ceramics prepared by high-energy ball mill method

et al. 2023

J Mater Sci: Mater Electron

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Effect of Zn/Fe co-doping on the microstructure, electrical properties and aging behavior of Co–Mn–Ni–O NTC ceramics

Cited by 8 publications

References 35 publications

Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method

Nano–Crystalline Mn–Ni–Co–O Thermistor Powder Prepared by Co–Precipitation Method

Water-Stable Hybrid Lead-Free Perovskite for Negative Temperature Coefficient Thermistors

Aging improvement in Ho-doped NTC ceramics prepared by high-energy ball mill method

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