New negative temperature coefficient thermistor ceramics in Mn-doped CaCu3−xMnxTi4O12 (0≤x≤1) system
Source abstract
Abstract
New negative temperature coefficient (NTC) ceramics based on CaCu3-xMnxTi4O12 ( 0 x 1 ) compositions have been investigated. The grain size of the CaCu3-xMnxTi4O12 samples decreases at first and then increases with increasing Mn content. The X -ray photoelectron spectroscopy analysis corroborates the presence of Mn3+ and Mn4+ in Mn-doped samples, which results in a decrease in the activation energy. All the NTC thermistors prepared show a linear relationship between the natural logarithm of the resistivity and the reciprocal temperature , indicative of NTC characteristics. The Mn-doped CaCu3-xMnxTi4O12 NTC thermistors provide various electrical properties, depending on Mn content. The values of p25, B constant and activation energy of the NTC thermistors are in the range of 2.22 x 10(6)-3.22 x 10(-8) Omega cm, 5488-8031 K, and 0 .473- 0 .692 eV, respectively.
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Research context
OpenAlex topics: Dielectric properties of ceramics · Electrical and Thermal Properties of Materials · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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