Correlation between the structure, the microstructure and the electrical properties of nickel manganite negative temperature coefficient (NTC) thermistors

Fritsch, Sophie; Sarrias, J.; Brieu, M.; Couderc, Jean-Jacques; Baudour, J. L.; Snoeck, E.; Rousset, A.

doi:10.1016/s0167-2738(98)00080-0

Cited by 148 publications

(88 citation statements)

References 7 publications

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“…The cubic spinel compound NiMn 2 O 4 (NMO) has been well known for many decades as the basis of negative temperature coefficient (NTC) thermistor materials. [1][2][3][4][5][6][7] The electrical resistance shows a uniform exponential increase with decreasing temperature, which makes the material applicable in industrial temperature sensor or compensator applications. [8][9][10][11] For such applications, different NMO film types or bulk devices with a wide range of dopants are commonly used in order to tune the device performance to the application's requirements.…”

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In-plane impedance spectroscopy in aerosol deposited NiMn2O4 negative temperature coefficient thermistor films

Ryu

Park

Schmidt

2011

Journal of Applied Physics

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Temperature dependent in-plane impedance spectroscopy measurements were carried out in order to analyze the charge transport properties of functional oxide NiMn2O4 negative temperature coefficient thermistor films deposited via aerosol deposition techniques onto glass and Al2O3 substrates. The in-plane resistivity (ρ) versus temperature (T) curves of all films were uniform over a large temperature range (180 K to 500 K) and showed the typical exponential power-law behavior associated with variable-range hopping. The ρ-T dependences of annealed and as-deposited films exhibited power-law exponents p of about 0.6 and thermistor constants B in the range of 3500 K to 5000 K. As-deposited films showed higher p values as compared to annealed films. As-deposited films exhibited also increased B values, leading to increased sensitivity of the resistance to temperature changes, whereas annealed films deposited on Al2O3 showed the lowest scatter in differentiated ρ-T data and might display superior reliability for temperature sensing applications.

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confidence: 99%

In-plane impedance spectroscopy in aerosol deposited NiMn2O4 negative temperature coefficient thermistor films

Ryu

Park

Schmidt

2011

Journal of Applied Physics

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“…On the other hand, the structural relaxation of those kinds of NTC compounds limits their applications at temperatures below 200 ℃. In Ni x Mn 3x O 4 ceramics, the lowest electrical resistivity can be obtained at x = 0.66, and the value is about 1900 Ω·cm [7,8]. In order to further decrease the resistivity, Cu is doped into nickel manganites, e.g., the resistivity of Cu 0.2 Ni 0.5 Mn 2.3 O 4  decreases to 70 Ω·cm.…”

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Characterization of new negative temperature coefficient thermistors based on Zn–Ni–O system

Sun

Zhang

et al. 2016

J Adv Ceram

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Y 2 O 3 -doped Zn 1x Ni x O (x = 0, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.9) powders were prepared by a wet chemical synthesis method, and the related ceramics were obtained by the traditional ceramic sintering technology. The phases and related electrical properties of the ceramics were investigated. The analysis of X-ray diffraction (XRD) indicates that the prepared ceramics with Ni substitution have a cubic crystalline structure. The resistance-temperature feature indicates that all the ceramics show a typical effect of negative temperature coefficient (NTC) of resistivity with the thermal constants between 3998 and 5464 K, and have high cyclical stability in a temperature range from 25 to 300 ℃. The impedance analysis reveals that both grain effect and grain boundary effect contribute collectively to the NTC effect. The electron hopping and band conduction models are proposed for the grain (bulk) conduction, and the thermally activated charge carrier transport overcoming the energy barrier is suggested for the grain boundary conduction.

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confidence: 98%

“…The homogeneity is a very important parameter for having reproducible properties. Our previous studies performed on spinel manganites have evidenced the influence of the powder quality on the final material properties [4,5].The electronic properties are related to the mixed valence state Mn3+/Mn4+ that leads to mobile charge carriers. Low temperature synthesis allows moreover a larger oxidation state [6].…”

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Advances in the Low Temperature Preparation and Structural Characterization of Lanthanum Strontium Manganite Powder

et al. 2001

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Perovskite oxides of formula Lal-xSrMnO 3 have been obtained by the thermal decomposition of precursor powders. Two different kinds of precursors, carbonates and citrates have been prepared by low temperature, i.e., "chimie douce" technique. The careful control of the chemical and the hydrodynamic parameters during the synthesis process allows obtaining nice homogeneous and small size particles (80 nm for the ex-carbonates and 30 nm for ex-citrates). Pure perovskite phase is observed after a low temperature thermal treatment, from 550 'C. The structure of these oxides is either rhombohedral or cubic and depends on the strontium content, the temperature and the partial pressure of oxygen during the thermal treatment. The Mn-O distances and the Mn-O-Mn angles are directly related to the amount of Mn 4 + content. INTRODUCTIONIn recent years, the doped perovskite manganites such as Lal-,SrMnO 3 have attracted growing attention due to the colossal magnetoresistance (CMR) properties. Several studies have shown that the microstructure, such as grain size, plays a very significant role in the intrinsic properties [ 1,2]. The synthesis methods are very important to obtain polycrystalline materials with specific microstructure.Traditional way of processing is usually the mixing of oxides, hydroxides or carbonates, followed by high temperature (T > 1000 'C) processing. Consequently, the materials obtained with these methods are constituted of large particles with low surface area. "Soft chemistry" techniques have been developed in order to obtain -at lower temperature -the same materials as the one observed at high temperature with the ability to control the particle size, the surface area and the stoichiometry of the powders [3]. The advantages of using powders of reduced grain size to prepare ceramics or thick films is the increase of the reactivity and the possibility of lowering the sintering temperature. The homogeneity is a very important parameter for having reproducible properties. Our previous studies performed on spinel manganites have evidenced the influence of the powder quality on the final material properties [4,5].The electronic properties are related to the mixed valence state Mn3+/Mn4+ that leads to mobile charge carriers. Low temperature synthesis allows moreover a larger oxidation state [6]. It was also observed that high oxygen ionic conductivity correlates with a cubic or an orthorhombic structure [7,8]. The coefficient of non stoichiometry 8 depends on the temperature of thermal treatment and on the oxygen partial pressure [9]. The highest values of 8 have been obtained for low temperature synthesis technique [10]. Many recent studies indicate that the LaMnO 3 + 8 compounds exhibit different structural types as orthorhombic Pnma, rhombohedral R3c,

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Correlation between the structure, the microstructure and the electrical properties of nickel manganite negative temperature coefficient (NTC) thermistors

Cited by 148 publications

References 7 publications

In-plane impedance spectroscopy in aerosol deposited NiMn2O4 negative temperature coefficient thermistor films

In-plane impedance spectroscopy in aerosol deposited NiMn2O4 negative temperature coefficient thermistor films

Characterization of new negative temperature coefficient thermistors based on Zn–Ni–O system

Advances in the Low Temperature Preparation and Structural Characterization of Lanthanum Strontium Manganite Powder

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