Electrical properties of Ni0.5Co0.8Mn1.7O4 and Ni0.5Co1.1Mn1.4O4 negative temperature coefficient ceramics doped with B2O3

Price, Berat Yüksel; Hardal, Gökhan

doi:10.1007/s10854-021-05569-3

Cited by 2 publications

(3 citation statements)

References 27 publications

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“…Negative temperature coefficient of resistance (NTCR) nickel manganite oxide ceramics have been widely used for the production of thermistors owing to their excellent temperature sensitivity and cost-effectiveness [1][2][3]. These materials are absolutely leadfree, and are thus friendly to humans and environment, making them eligible for full RoHS compliance.…”

Section: Introductionmentioning

confidence: 99%

“…The electrical properties of the spinel nickel manganite ceramics are strongly affected by imperfections, that cause changes in the distribution of cations in the spinel lattices. Therefore, to alter ρ 25 and B 25/85 , the ceramic compositions have been modified (doping/substituting) with various transition metal ions [1,3,5]. Previous investigations have stated that cobalt (Co) is one the most effective ions for fine-tuning the conductivity without much degradation of temperature sensitivity [1,[4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, to alter ρ 25 and B 25/85 , the ceramic compositions have been modified (doping/substituting) with various transition metal ions [1,3,5]. Previous investigations have stated that cobalt (Co) is one the most effective ions for fine-tuning the conductivity without much degradation of temperature sensitivity [1,[4][5][6][7][8][9]. Furthermore, incorporating Co was also demonstrated to improve the electrical stability of the nickel manganites [10,11].…”

Section: Introductionmentioning

confidence: 99%

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

Cho

2023

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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: Introductionmentioning

confidence: 99%