Resistance-temperature characteristics of a new high-temperature thermistor ceramics of Mn-doping Ba–Ca–Zr–Ti–O system

Abstract

The Mn-doped (Ba 0.85 Ca 0.15 )(Ti 0.9 Zr 0.1 ) 1-x Mn x O 3 (x = 0.000, 0.005, 0.010, 0.015, 0.100) (BCZTM) negative temperature coefficient (NTC) thermistor ceramics were prepared by solid-state method, and a research of their microstructures and electrical properties was also carried out. The excellent NTC properties of BCZTM ceramics sintered at high temperature were characterized by X-ray diffraction (XRD), scanning electron microscope, X-ray photoelectron spectroscopy, Raman spectroscopy, and infrared spectra (IR) analysis in this study. It is proved that the sintering temperature of BCZTM NTC thermistor ceramics is reduced by doping; it possesses a wide working temperature range (200-1100°C) as well. All XRD, Raman, and IR spectra indicate the formation of perovskite phase. A trace Mn-doping can regulate the resistivity and activation energy of materials, yielding B 400/900 = 9992.1-11186.8 K, q 900 = 245.9-664.4 X cm, E a600/900 = 0.9649-1.0175 eV, whereas excessive (x = 0.100) Mn-doping leads to a second phase. Besides, owing to small aging coefficient at 900°C (less than 0.8%) and good high temperature stability, it can be used as a candidate material for high temperature and harsh environment.

Improved Energy Storage Density and Efficiency of Nd and Mn Co-Doped Ba0.7Sr0.3TiO3 Ceramic Capacitors Via Defect Dipole Engineering

“…The inset of Figure 10 shows the high-resolution XPS spectra of O 1s, which was divided into two distinct peaks: the first peak (OI) found at 529.08 eV indicates an oxygen lattice, and the second peak (OII) at 531.16 eV is related to oxygen vacancies [54]. The relative intensity of the BSNTM ceramics increases with Mn doping, and the x = 0.005 and y = 0.01 sample shows much a stronger relative intensity than that of other samples, which clearly indicates that the sample processes high oxygen vacancies (inset Figure 10) [55,56]. X-ray photoelectron spectroscopy (XPS) measurement was carried out to show the chemical states of Nd-and Mn-doped BST ceramics.…”