Effect of Cu and Fe addition on electrical properties of Ni–Mn–Co–O NTC thermistor compositions

Muralidharan, M. N.; Rohini, P.R.; Sunny, E. K.; Dayas, K.R.; Seema, A.

doi:10.1016/j.ceramint.2012.05.025

Cited by 78 publications

(29 citation statements)

References 15 publications

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“…As a temperature sensor, the sensitivity is an important parameter. The sensitivity coefficient (α T ) of NTC thermistor can be defined as the following equation:…”

Section: Resultsmentioning

confidence: 99%

SiCNO–GO composites with the negative temperature coefficient of resistance for high‐temperature sensor applications

Huang

Rhodes

et al. 2016

J Am Ceram Soc.

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We report the synthesis of silicon oxycarbonitride ceramic‐graphene oxide (SiCNO–GO) composites by using polyvinylsilazne (PVSZ) and GO as precursors through cross‐linking processes, in which GO organizes into microspheres in the SiCNO matrix. The formation of GO microspheres significantly enhances the electrical conductivity of SiCNO. The electrical resistivity of SiCNO–GO composites shows a negative temperature coefficient in the range from 25°C to 600°C. We demonstrate the application of SiCNO–GO composites as the functional component of high‐temperature sensors.

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“…As a temperature sensor, the sensitivity is an important parameter. The sensitivity coefficient (α T ) of NTC thermistor can be defined as the following equation:…”

Section: Resultsmentioning

confidence: 99%

SiCNO–GO composites with the negative temperature coefficient of resistance for high‐temperature sensor applications

Huang

Rhodes

et al. 2016

J Am Ceram Soc.

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show abstract

“…This gives rise to a decrease of the resistivity, B-value and temperature coefficient of resistance. 2 This phenomenon is prominent for all samples sintered at 1100°C, while the Co content was increasing in the samples. Similar trends were also observed for the A1, A2 and A6 compositions when the samples were sintered at 1200°C.…”

Section: Discussionmentioning

confidence: 82%

Influence of nano-sized cobalt oxide additions on the structural and electrical properties of nickel-manganite-based NTC thermistors

Hardal¹,

Price²

2016

Mater. Tehnol.

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The structural and electrical properties of NiMn2O4 and Ni0.5CoxMn2.5-xO4 (where x = 0.5, 0.8 and 1.1) NTC thermistors have been investigated. The samples, prepared by conventional ceramic processing techniques, were calcinated at 900°C for 2 h and then sintered at 1100°C and 1200°C for 5 h. The cubic spinel phase was observed by XRD analysis in the NiMn2O4 and Ni0.5Co0.8Mn1.7O4 samples sintered at 1100°C for 5 h. The sintering at 1200°C resulted in much denser microstructures with a larger grain size. The room-temperature electrical resistivity (r25) and material constant (B) value of the NiMn2O4 sample sintered at 1100°C were 7710 W cm and 3930 K, respectively. The electrical resistivity of the samples decreased significantly with the addition of Co3O4. The B25/85 values of the Ni0.5CoxMn2.5-xO4 (where x = 0.5, 0.8 and 1.1) samples sintered at 1100°C were found to be 3820 K, 3525 K and 3270 K, respectively. Keywords: cobalt oxide, electrical properties, microstructure, NTC thermistor Preiskovana je bila zgradba in elektri~ne lastnosti NiMn2O4 in Ni0.5CoxMn2.5-xO4 (kjer je x = 0,5, 0,8 in 1,1) NTC termistorjev. Vzorci, pripravljeni po obi~ajni tehniki priprave keramike, so bil kalcinirani 2 h na 900°C in potem 5 h sintrani na 1100°C in 1200°C. Kubi~na {pinelna faza je bila opa`ena pri XRD-analizi, v vzorcih NiMn2O4 in Ni0.5Co0.8Mn1.7O4, sintranih 5 h na 1100°C. Sintranje na 1200°C je povzro~ilo mnogo bolj gosto mikrostrukturo z ve~jimi zrni. Vrednosti za elektri~no upornost pri sobni temperaturi (r25) in materialne konstante (B) vzorca NiMn2O4, sintranega na 1100°C, sta bili 7710 W cm in 3930 K. Elektri~na upornost vzorcev se je ob~utno zmanj{ala po dodatku Co3O4. Vrednosti B25/85 pri vzorcih Ni0.5CoxMn2.5-xO4 (kjer je bil x = 0,5, 0,8 in 1,1) sintranih na 1100°C so bile: 3820 K, 3525 K in 3270 K.

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“…As a result of the temperature coefficient of resistance (TCR = 1/R * dR/dT), all Ni x Mn 3 − x O 4 specimens showed values −4%/°C above the typical NTCR properties and Ni 0.79 Mn 2.21 O 4 specimens showed the maximum value of −4.2%/°C. In order to use in infrared sensors, low resistivity, good sensitivity and detectivity are required [7]. It is known that the electrical properties in a spinel structure are due to the hopping of electrons between the Mn 3 + and Mn 4+ ions present at the octahedral sites [8].…”

Section: Measurementmentioning

confidence: 99%

Structural and electrical properties of NixMn3−xO4 system ceramics for infrared sensors

Jung

Lee

Kim

et al. 2015

Microelectronic Engineering

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Effect of Cu and Fe addition on electrical properties of Ni–Mn–Co–O NTC thermistor compositions

Cited by 78 publications

References 15 publications

SiCNO–GO composites with the negative temperature coefficient of resistance for high‐temperature sensor applications

SiCNO–GO composites with the negative temperature coefficient of resistance for high‐temperature sensor applications

Influence of nano-sized cobalt oxide additions on the structural and electrical properties of nickel-manganite-based NTC thermistors

Structural and electrical properties of NixMn3−xO4 system ceramics for infrared sensors

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