Aging characteristic of Cu-doped nickel manganite NTC ceramics

Zhao, Mo; Chen, Wei; Wu, Wei; Zhang, Maolin; Li, Zhimin

doi:10.1007/s10854-020-03730-y

Cited by 14 publications

(8 citation statements)

References 37 publications

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“…The ∆R/R should be as small as possibleto maintain the reproducibility of the thermistor parameters such as ρ 25 and B 25/85 . In this work, the ∆R/R was 5.65% for S1 ceramics (Table 4), which is comparable to that of the Cu 0.3 Ni 0.66 Mn 2.04 O 4 bulks derived from mixed oxalate powder [43] but much lower than those of conventional Cu-doped nickel manganites [6,44]. The underlying mechanism of resistance driftin Cucontaining nickel manganites generally involves cationic oxidation and cationic migration from the A sites to the B sites in the spinel structure [45,46].…”

Section: Electrical Properties Of Sintered Ceramicssupporting

confidence: 66%

“…Particularly, the Cu + ions at the A sites oxidize to Cu 2+ during aging (heating in an air atmosphere), which results in the migration of Cu ions from the A sites to the B sites. This ion migration decreases the Mn 4+ content, and therefore leads to an increase in resistance [ 44 , 47 ]. In our case, the relative low aging coefficient of S1 is possibly because of an increase in the concentration of Cu 2+ ion and a decrease in the concentration of Cu + ion in the pristine ceramics due to the relatively low sintering temperature [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

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Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

2021

Materials

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Toward the development of NTCR thermistors, nanocrystalline Mn–Ni–Cu–O powder was synthesized from a mixed chloride aqueous solution by a simple co-precipitation method.The introduction of an oxidizing agent (H2O2) into the solution led to the partial oxidation of Mn2+ ions into Mn3+ ions, which enabled the collected powder to be well crystallized at 650 °C. Such a low calcining temperature resulted in fine particles with a mean size of 60 nm, which significantly promoted densification of the resulting ceramics. As a result, a dense and homogenous microstructure with a relative density up to 97.2% was achieved for pellets sintered at 1100 °C. Furthermore, these sintered ceramics exhibited a room temperature resistivity (ρ25) of 67 Ω·cmand a thermistor constant (B25/85) of 2843 K, which make them suitable for use in industrial thermistors. In addition, electrical stability was greatly improved when the ceramics were prepared by a new two-step sintering method. The results suggest that the co-precipitation route with the introduction of H2O2 is suitable for the fabrication of cubic spinel thermistor nanopowders.

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Section: Electrical Properties Of Sintered Ceramicssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

2021

Materials

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“…A serious problem of NTC thermistors in practical applications is that their electrical resistance drifts over time, which is known as aging. The aging mechanism is still unclear, and several phenomena have been used to try to explain this aging, including redistribution of cations, disproportionation between trivalent and tetravalent Mn cations, changes in the oxidation state of Mn cations, reaggregation of cations and electrons, and reconfiguration of the electrode/ceramic interface 29 . The aging phenomenon contributes to the inferior electrical stability and reproducibility of ceramics, which affects the long-term stability of temperature sensors.…”

Section: Resultsmentioning

confidence: 99%

All-inorganic ultrathin high-sensitivity transparent temperature sensor based on a Mn-Co-Ni-O nanofilm

Cui,

Sun,

Liu

et al. 2024

Microsyst Nanoeng

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The demand for optically transparent temperature sensors in intelligent devices is increasing. However, the performance of these sensors, particularly in terms of their sensitivity and resolution, must be further enhanced. This study introduces a novel transparent and highly sensitive temperature sensor characterized by its ultrathin, freestanding design based on a Mn-Co-Ni-O nanofilm. The Mn-Co-Ni-O-based sensor exhibits remarkable sensitivity, with a temperature coefficient of resistance of −4% °C−1, and can detect minuscule temperature fluctuations as small as 0.03 °C. Additionally, the freestanding sensor can be transferred onto any substrate for versatile application while maintaining robust structural stability and excellent resistance to interference, indicating its suitability for operation in challenging environments. Its practical utility in monitoring the surface temperature of optical devices is demonstrated through vertical integration of the sensor and a micro light-emitting diode on a polyimide substrate. Moreover, an experiment in which the sensor is implanted in rats confirms its favorable biocompatibility, highlighting the promising applications of the sensor in the biomedical domain.

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“…Obviously, the ΔR/R indicates poor electrical stability of films with Cu-rich compositions. In a very recent article, the Cu was reported to cause a remarkable resistance drift up to 33% in Ni 0.7 Mn 2.3-x Cu x O 2 ceramics upon heating at 300°C [29]. Since electrical stability is one of the crucial technical parameters for ensuring the reliability of ultimate devices, the aging characteristic is necessary to improve.…”

Section: Microstructure and Electrical Properties Of Cu-doped (Nimn) 3 O 4 Thin Filmsmentioning

confidence: 99%

Electrical properties and stability of low temperature annealed (Zn,Cu) co-doped (Ni,Mn)₃O₄ spinel thin films

Cho

2021

Journal of Asian Ceramic Societies

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Toward the development of infrared (IR) detectors, nickel-manganite-based thin films were initially prepared from (Ni 0.2 Mn 2.8-x Cu x )Cl 2 (0.010 ≤ x ≤ 0.040) solutions using the liquid flow deposition (LFD) method. The influence of Cu on the negative temperature coefficient of resistance (NTCR) characteristic of the films annealed at 400°C was investigated. It was found that the incorporation of Cu can effectively enhance electrical conductivity; however, it degrades both the thermal sensitivity and stability of the nickel-manganite films. The investigation was extended by further modifying the composition with Zn. The results revealed that by co-doping Cu with a proper amount of Zn the temperature coefficient of resistance (TCR) could be tailored, while a relatively low resistivity (ρ) of the final products was retained. Specially, when 0.01 mol Zn was added to a precursor solution containing 0.025 mol Cu, the resulting specimen possessed a TCR = 2.82% K -1 and a ρ = 820 Ω (measured at RT). More importantly, compared to Zn-free films, the (Zn,Cu) co-doped compositions showed much improved electrical stability, with an aging coefficient (ΔR/R) as low as 4.6%, after aging at 150° C in air for 500 h. The results suggest that the (Zn,Cu) co-doped (Ni,Mn) 3 O 4 thin films have a promising application in IR detectors.

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Aging characteristic of Cu-doped nickel manganite NTC ceramics

Cited by 14 publications

References 37 publications

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

All-inorganic ultrathin high-sensitivity transparent temperature sensor based on a Mn-Co-Ni-O nanofilm

Electrical properties and stability of low temperature annealed (Zn,Cu) co-doped (Ni,Mn)₃O₄ spinel thin films

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Aging characteristic of Cu-doped nickel manganite NTC ceramics

Cited by 14 publications

References 37 publications

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

All-inorganic ultrathin high-sensitivity transparent temperature sensor based on a Mn-Co-Ni-O nanofilm

Electrical properties and stability of low temperature annealed (Zn,Cu) co-doped (Ni,Mn)3O4 spinel thin films

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Product

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Electrical properties and stability of low temperature annealed (Zn,Cu) co-doped (Ni,Mn)₃O₄ spinel thin films