Characterization of transition metal oxide ceramic material for continuous thermocouple and its use as NTC fire wire sensor

Singla, Madan Lal; Sharma, Shweta; Raj, Baldev; Harchekar, V R

doi:10.1016/j.sna.2004.12.014

Cited by 22 publications

(8 citation statements)

References 11 publications

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“…The experimental data show NTCR property. The dependence of resistance on temperature approximately follows an exponential [11][12][13][14][15][16][17][18]. Hence the experimental data match with the Steinhart-Hart equation, revealing the significance of nano crystalline CaTiO 3 as a promising environment friendly material for high temperature thermistor application.…”

Section: Electrical Characteristicsmentioning

confidence: 66%

“…Alexander and MacQuarrie [10] selected the Steinhart-Hart equation and presented the procedure to calculate negative temperature coefficient of thermistor in order to improve accuracy [11]. The Steinhart-Hart equation is derived from mathematical curve fitting techniques and examination of the resistance vs. temperature characteristic of thermistor devices.…”

Section: Introductionmentioning

confidence: 99%

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CaTiO3 nano ceramic for NTCR thermistor based sensor application

2014

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Abstract:It is possible to fabricate highly sensitive NTCR (negative temperature coefficient of resistance) thermistor using nano crystalline CaTiO 3 synthesized by high energy ball milling. Disc shaped green pellets were prepared and effects of sintering on the disc pellets were studied as thermistor by sintering the samples at 1000 ℃, 1100 ℃ and 1200 ℃. The as-prepared samples were characterized by X-ray diffraction (XRD), impedance analysis and electrical measurement. The resistivity of the prepared samples varies predictably with temperature: this makes them promising material for temperature sensor. The experimental results prove that nano crystalline CaTiO 3 ceramic is one kind of thermistor with exponential negative temperature coefficient of resistance in the temperature range of 300-500 ℃. The samples have the advantages of rapid response, high sensitivity and capability to withstand thermal surges over the temperature range of 300-500 ℃. Resistance-temperature characteristics are described by thermistor equation with thermistor constant around 4003 K to 10795 K and thermal coefficient of resistance α around 1%/℃ to 13%/℃. The activation energy is in the range of 0.34-0.93 eV. The observed thermistor parameters are found to be comparable with many of the known thermistor materials. This suggests that the electrical properties can be adjusted to desirable values by controlling the temperature parameter. The influence of fabrication process of disc thermistor and electrical properties are discussed. The study shows the potential of nano crystalline CaTiO 3 to act as an NTCR material for thermistor applications.

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Section: Electrical Characteristicsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

CaTiO3 nano ceramic for NTCR thermistor based sensor application

2014

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“…The manual fabrication of continuous detector was limited to 3 m length due to physical restrictions in the method of filling 10 . Hence, the option of coupling two 3 m detectors and so on, to make a length of 15 m was decided.…”

Section: Methodsmentioning

confidence: 99%

“…The study on the NTC behaviour of powder mixture Mn 3 O 4 and La 2 O 3 powder mixture over a temperature range of 100-400 o C has been reported 10 . The paper highlights NTC mixture used to fabricate continuous thermal detectors of 3 m length.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Continuous Fire Wire Detection Sensor using Negative Temperature Coefficient Material

Singla¹,

Pandey²

2007

DSJ

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Manganese-based spinel semiconducting ceramic was mixed with lanthanum oxide powder and the mixture was characterised for the reproducible negative temperature coefficient (NTC) of resistance behaviour. The same mixture was used for the fabrication of 15 m long continuous thermal detector. The addition of La 2 O 3 leads to decrease in thermistor constant and activation energy values, thus giving freedom to fabricate thermal sensors for various temperature applications. A 3 m long continuous thermal detector for application in the temperature range 275 -350 o C was fabricated and later coupled to form a continuous unit of 15 m length.

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“…Negative temperature coefficient (NTC) ceramic thermistors have been widely used for temperature measurement and compensation due to their high sensitivity to temperature change and low price [1][2][3]. The specific resistivity ρ of these ceramics follows the well-known Arrhenius relation:…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of negative temperature coefficient (Ni,Mn)3O4–La(Mn,Ni)O3 composite

Zhao

Wang

et al. 2007

J Electroceram

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The composites made of spinel-structured (Ni, Mn) 3 O 4 and perovskite-structured La(Mn,Ni)O 3 were investigated for potential application as negative temperature coefficient (NTC) thermistor. The composites were prepared using the standard ceramic route. The electrical resistivity of the composite at 25°C was found to decrease by one to two orders of magnitude depending the amount of the low-resistivity perovskite phase, while the thermal constant determining the temperature sensitivity of the NTC thermistor was still reasonably large in the range of 4,000 to 3,000 K, and the resistivity drift after annealing at 150°C for 1,000 h in air was relatively small (∼1.2%). The general effective media model was adopted to fit the electrical resistivity data of the composites, giving a value of 0.37 for the percolation volume fraction of the perovskite phase. This work demonstrates that it is possible to tune the electrical resistivity and thermal constant of the spinel-structured oxide through making composite with low-resistivity perovskitestructured oxide.

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Characterization of transition metal oxide ceramic material for continuous thermocouple and its use as NTC fire wire sensor

Cited by 22 publications

References 11 publications

CaTiO3 nano ceramic for NTCR thermistor based sensor application

CaTiO3 nano ceramic for NTCR thermistor based sensor application

Fabrication of Continuous Fire Wire Detection Sensor using Negative Temperature Coefficient Material

Preparation and characterization of negative temperature coefficient (Ni,Mn)3O4–La(Mn,Ni)O3 composite

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