Frequency and temperature dependent electrical characteristics of CaTiO3 nano-ceramic prepared by high-energy ball milling

Sahoo, Subhanarayan; Dash, Umasankar; Parashar, S. K. S.; Ali, S. M.

doi:10.1007/s40145-013-0075-8

Cited by 99 publications

(32 citation statements)

References 20 publications

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“…The broadening of the peak also occurs with increasing temperature, indicating the spread of relaxation with a different mean time constant. The results confirm the nonDebye type temperature dependent relaxation in these ceramics [62], which is also in good agreement with the impedance results mentioned above.…”

Section: Resultssupporting

confidence: 91%

A novel low cost non-aqueous chemical route for giant dielectric constant CaCu3Ti4O12 ceramic

Singh

Kim

Woo

et al. 2015

Solid State Sciences

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Section: Resultssupporting

confidence: 91%

A novel low cost non-aqueous chemical route for giant dielectric constant CaCu3Ti4O12 ceramic

Singh

Kim

Woo

et al. 2015

Solid State Sciences

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“… , a material characteristic, shows the percentage resistance change per degree centigrade [25,26]. It is also referred as the temperature coefficient.…”

Section: Electrical Characteristicsmentioning

confidence: 99%

CaTiO3 nano ceramic for NTCR thermistor based sensor application

2014

Self Cite

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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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“…Sample dielectric constants values measured at 1 MHz was found to range from 231 to 326, which is slightly higher compared to the 160 -225 values reported by other workers [23][24][25][26][27]. Samples prepared by solution combustion technique resulted in higher dielectric constants than samples prepared solid state reaction (Figure 10a).…”

Section: Effects Of Synthesis Techniques On Dielectric Constantmentioning

confidence: 60%

Effects of synthesis techniques on chemical composition, microstructure and dielectric properties of Mg-doped calcium titanate

Jongprateep¹,

Sato²

2018

AIP Conference Proceedings

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Chemical synthesis and characterization of hollow dopamine coated, pentagonal and flower shaped magnetic iron oxide nanoparticles AIP Conference Proceedings 1957, 020004 (2018) Compositional analysis revealed that powder synthesis techniques did not exhibit a significant effect on formation of secondary phases. When Mg concentration did not exceed 5 at%, the powders prepared by both techniques contained only a single phase. An increase of MgO secondary phase was observed as Mg concentrations increased from 10 to 20 at%. Experimental results, on the contrary, revealed that powder synthesis techniques contributed to significant differences in microstructure. Solution combustion technique produced powders with finer particle sizes, which consequently led to finer grain sizes and density enhancement. High-density specimens with fine microstructure generally exhibit improved dielectric properties. Dielectric measurements revealed that dielectric constants of all samples ranged between 231 and 327 at 1 MHz, and that superior dielectric constants were observed in samples prepared by the solution combustion technique.

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Frequency and temperature dependent electrical characteristics of CaTiO3 nano-ceramic prepared by high-energy ball milling

Cited by 99 publications

References 20 publications

A novel low cost non-aqueous chemical route for giant dielectric constant CaCu3Ti4O12 ceramic

A novel low cost non-aqueous chemical route for giant dielectric constant CaCu3Ti4O12 ceramic

CaTiO3 nano ceramic for NTCR thermistor based sensor application

Effects of synthesis techniques on chemical composition, microstructure and dielectric properties of Mg-doped calcium titanate

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