Preparation of Ultra‐Fine Nickel Manganite Powders and Ceramics by a Solid‐State Coordination Reaction

Fang, Dao-Lai; Wang, Zhongbing; Yang, Pinghua; Liu, Wei; Chen, Chusheng; Winnubst, Louis

doi:10.1111/j.1551-2916.2005.00666.x

Cited by 51 publications

(30 citation statements)

References 18 publications

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“…NiMnO 3 and aMn 2 O 3 were not detected in the 700-, 750-, and 800°C-calcined powders. As previously reported [2,13,[23][24][25][26], within the temperature range of 450-550°C, NiMn 2 O 4 reacts with oxygen and decomposes into NiMnO 3 and aMn 2 O 3 , but it does not occur in inert atmosphere. The NiMnO 3 and a-Mn 2 O 3 phases are stable in the temperature range of 550-750°C [27,28].…”

Section: Resultssupporting

confidence: 54%

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Preparation and characterization of NiMn2O4 negative temperature coefficient ceramics by solid-state coordination reaction

Gao

Sun³

2014

J Mater Sci: Mater Electron

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The influence of synthesis parameters, such as calcination temperature and sintering temperature, on the microstructure, phase composition, and electrical properties of NiMn 2 O 4 negative temperature coefficient (NTC) ceramics was systematically investigated. The NiMn 2 O 4 NTC ceramics were synthesized via solid-state coordination reaction. With increasing sintering temperatures, the relative density increased, whereas the porosity decreased. Single-phase, cubic spinel ceramic was obtained following sintering at 900 and 1,050°C, whereas a secondary phase, i.e., NiO, was detected when the sintering temperature was higher than 1,100°C. High-density ceramics were obtained when the sintering temperature was higher than 1,100°C, and featured the lowest room temperature resistivity of 2,924 X cm and thermal constant B of 3,429 K. The latter parameter reflects the temperature sensitivity of the NTC ceramics. Variations of the electrical property were because of increases in density and onset of decomposition.

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Section: Resultssupporting

confidence: 54%

“…Among these methods, solid-state coordinate reaction [13,14] has attracted the most interest because of some unique advantages, such as non-pollution and accurate stoichiometry. The electrical properties of such spinel-type ceramics strongly depend on the preparation technology and composition.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of NiMn2O4 negative temperature coefficient ceramics by solid-state coordination reaction

Gao

Sun³

2014

J Mater Sci: Mater Electron

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“…The mixed nickel manganese oxalate precursors for Ni x Mn 3−x O 4+δ (x=0.56, 0.66, 0.76, 0.82, 1.0) oxide powders were prepared by the route of solid-state coordination reaction, which was described in detail in our previous work [1]. The mixed oxide powders were obtained by calcining the mixed oxalate precursors at 850°C for 2 h. The oxide powders were uniaxially pressed at 60 MPa to form disk-shaped samples with a diameter of ∼6 mm and a thickness of ∼3 mm, and then isostatically pressed at 300 MPa.…”

Section: Preparation Of the Ceramic Samplesmentioning

confidence: 99%

“…The accurate contents of Ni and Mn ions in the resulting ceramics were determined by chemical analysis, which was described in our previous work [1]. The method for determination of the oxygen non-stoichiometry δ of Ni x Mn 3−x O 4+δ ceramic samples is elucidated in brief as follows:…”

Section: Determination Of Chemical Compositions and Oxygen Non-stoichmentioning

confidence: 99%

“…As a kind of the technologically important semiconducting materials for negative temperature coefficient (NTC) thermistors, spinel nickel manganite ceramics have been extensively investigated, involving their preparation, microstructure, cation distribution and electrical properties [1][2][3][4]. It is widely accepted that cation distribution of Ni x Mn 3−x O 4 is expressed as Ni 2þ…”

Section: Introductionmentioning

confidence: 99%

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Aging of nickel manganite NTC ceramics

et al. 2008

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Effect of thermal history and chemical composition on aging of Ni x Mn 3−x O 4+δ (0.56≤x≤1.0) ceramics was investigated. It was found that all the Ni x Mn 3 − x O 4+δ ceramic samples metallized by co-firing at 1050°C showed significant electrical stability with an aging coefficient less than 1.0%, while aging of those metallized by annealing at 850°C was increasingly serious with a rise in Ni content x, the aging coefficient ranging from 0.2% to 3.8%. However, the ceramic samples with Ni content x≤0.70, whether metallized by co-firing or by annealing, exhibited extraordinarily high electrical stability with an aging coefficient less than 0.5%. The composition dependence of aging of the ceramic samples was explained qualitatively, based on the electrical conduction mechanism of small polaron hopping and on the aging mechanism of the cationic vacancy-assisted migration of cations to their thermodynamically preferable sites under thermal stress.

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Sensitive Wearable Temperature Sensor with Seamless Monolithic Integration

et al. 2019

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Accurate temperature field measurement provides critical information in many scientific problems. Herein, a new paradigm for highly sensitive, flexible, negative temperature coefficient (NTC) thermistor‐based artificial skin is reported, with the highest temperature sensing ability reported to date among previously reported NTC thermistors. This artificial skin is achieved through the development of a novel monolithic laser‐induced reductive sintering scheme and unique monolithic structures. The unique seamless monolithic structure simultaneously integrates two different components (a metal electrode and metal oxide sensing channel) from the same material at ambient pressure, which cannot be achieved by conventional heterogeneous integration through multiple, complex steps of photolithography or vacuum deposition. In addition to superior performance, electronic skin with high temperature sensitivity can be fabricated on heat‐sensitive polymer substrates due to the low‐temperature requirements of the process. As a proof of concept, temperature‐sensitive artificial skin is tested with conformally attachable physiological temperature sensor arrays in the measurement of the temperatures of exhaled breath for the early detection of pathogenic progression in the respiratory system. The proposed highly sensitive flexible temperature sensor and monolithic selective laser reductive sintering are expected to greatly contribute to the development of essential components in various emerging research fields, including soft robotics and healthcare systems.

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Preparation of Ultra‐Fine Nickel Manganite Powders and Ceramics by a Solid‐State Coordination Reaction

Cited by 51 publications

References 18 publications

Preparation and characterization of NiMn2O4 negative temperature coefficient ceramics by solid-state coordination reaction

Preparation and characterization of NiMn2O4 negative temperature coefficient ceramics by solid-state coordination reaction

Aging of nickel manganite NTC ceramics

Sensitive Wearable Temperature Sensor with Seamless Monolithic Integration

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