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Synthesis and high thermal stability of Mn doped Y2/3Cu3Ti4O12 negative temperature coefficient ceramic
- Source :
- Journal of Solid State Chemistry. 303:122536
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- In this paper, high thermal stability of Mn doped Y2/3Cu3Ti4O12 negative temperature coefficient (NTC) ceramics have been successfully fabricated by the combination of Pechini powder synthesis and solid-state reaction sintering. The substitution of Mn for Ti plays a critical role in controlling the phase structure, microstructure, electrical properties, and stability. The structure of as-sintered ceramics is a single Y2/3Cu3Ti4O12 phase at x ≤ 0.5, while the CuO phase begins to appear at x ≥ 0.7. X-ray photoelectron spectroscopy further confirms the change of cation concentration, one of the critical factors for electrical conductivity in Y2/3Cu3Ti4-xMnxO12 ceramics. In the temperature of −50–250 °C, the resistivity all decreases with increasing temperature and Mn content, the aging coefficient of all samples is within 0.4%, and the minimum can reach 0.2%. We strongly propose that the Mn substitution and Pechini method are highly desirable for the fabrication of high stability NTC thermistors for medi-temperature region application.
- Subjects :
- Materials science
Analytical chemistry
Sintering
Condensed Matter Physics
Microstructure
Electronic, Optical and Magnetic Materials
Inorganic Chemistry
X-ray photoelectron spectroscopy
Electrical resistivity and conductivity
visual_art
Phase (matter)
Materials Chemistry
Ceramics and Composites
visual_art.visual_art_medium
Thermal stability
Ceramic
Physical and Theoretical Chemistry
Temperature coefficient
Subjects
Details
- ISSN :
- 00224596
- Volume :
- 303
- Database :
- OpenAIRE
- Journal :
- Journal of Solid State Chemistry
- Accession number :
- edsair.doi...........158998d30bf423d876918fc8666465bb