NTC characteristic of SnSb0.05O2–BaTi0.8Fe0.2O3−δ composite materials

Ouyang, Pan; Zhang, Hong; Xue, Dan; Li, Zhicheng

doi:10.1007/s10854-013-1342-8

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…At the impedance spectrum study of Ba 0.95 Bi 0.05 Ti 1-x Fe x O 3 ceramic at x=0.1 (Fig.5), all the curves showed a tendency to bend towards the abscissa to form semicircles with their centers below the real axis, having comparatively larger radii. For all ceramics (data not shown), the radii decrease with the increase of temperature, indicating negative temperature coefficient of resistivity (NTCR) behaviour of the materials 21,22 , generally found in case of semiconductors and at the same time showing a non-ideal Debye type behavior 23 . This nonideal behavior could be attributed to several factors such as grain orientation, grain boundary, stress-strain phenomena, and atomic defect distribution 24 .…”

Section: Electric Propertiesmentioning

confidence: 93%

Structural and dielectric properties of Ba0.95Bi0.05Ti1-xFexO3ceramics at x=0.0, 0.1 and 0.2 prepared by solid state method

Gouitaa¹,

Lamcharfi²,

Bouayad³

et al. 2019

Mediterr.J.Chem.,

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The Ba0.95Bi0.05Ti1-xFexO3 ceramics at (x=0.0, 0.1 and 0.2) were prepared by the solid-state reaction method. The effect of iron substitution on structural and dielectric properties of Ba0.95Bi0.05TiO3 ceramic was studied. These compounds are found to crystallize in only tetragonal phase for x = 0.0 and 0.1 and the mixture of tetragonal and hexagonal phases for x = 0.2. The dielectric properties of Ba0.95Bi0.05Ti1-xFexO3 ceramics at x=0.0, 0.1 and 0.2 of Fe -doping concentration. The dielectric measurements as a function of temperature and frequency are studied and showed two diffuse phase transition and relaxation phenomena. The evolution of dielectric permittivity as a function of the frequency of undoped Ba0.95Bi0.05TiO3 show a relaxation phenomenon for which is displaced to the higher frequencies accompanied by a decrease in dielectric constant when x increase. The Complex impedance Cole-Cole plots showed a negative temperature coefficient of resistivity (NTCR) behavior of the Ba0.95Bi0.05Ti1-xFexO3 materials and increased in grain and grain boundaries resistivity. The relaxation behavior in the test materials is found to be of non-Debye type.

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Section: Electric Propertiesmentioning

confidence: 93%

Structural and dielectric properties of Ba0.95Bi0.05Ti1-xFexO3ceramics at x=0.0, 0.1 and 0.2 prepared by solid state method

Gouitaa¹,

Lamcharfi²,

Bouayad³

et al. 2019

Mediterr.J.Chem.,

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“…Sn 0.95-x Sb 0.05 Zr x O 2 (x = 0, 0.025, 0.05, 0.075 and 0.1) powders were prepared by using a steric entrapment synthesis method that was polymerized with polyvinyl alcohol [19,22] 4 were dissolved into nitric acid solution. A proper amount of polyvinyl alcohol, polymeric carrier for the effective preparation of mixed oxides, was added into the solution.…”

Section: Methodsmentioning

confidence: 99%

“…The electrical properties of SnO 2 -based materials have been previously reported, e.g., appropriate doping with Sb 5? in SnO 2 leads to a deteriorated semiconductor with metal-like conductivity [18], and the minimum room-temperature resistivity q 25 in Sn 1-y Sb y O 2 ceramics could be obtained for a suitable y value [19]. Furthermore, SnO 2 -based oxides are also the potential metal oxide semiconductors for NTC thermistor devices [20].…”

Section: Introductionmentioning

confidence: 99%

Zr-substituted SnO2-based NTC thermistors with wide application temperature range and high property stability

Ouyang

Zhang

2015

J Mater Sci: Mater Electron

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Zr-substituted SnO 2 -based ceramics (Sn 0.95-x Sb 0.05 Zr x O 2 , x B 0.1) were prepared by using a wet-chemical synthesis method. The results show that the prepared ceramics have a pure tetragonal phase as that of SnO 2 and have a typical characteristic of negative temperature coefficient (NTC) of resistivity over a wide temperature range from -50 to 300°C. The room-temperature resistivity q 25 and material constant B 25/85 of the NTC thermistors increase from 4.77 X cm to 4.89 9 10 7 X cm and from 641 to 5085 K, respectively, when the content of Zr, x, changes from 0 to 0.1. The NTC thermistors also show high cyclic stability and ageing resistance. The analysis of impedance spectra reveals that the NTC effect mainly resulted from the grain-boundary contribution, and the conduction mechanisms of the Sn 0.95-x Sb 0.05 Zr x O 2 thermistors combine with the electron-hopping conduction and band conduction.

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“…However all the curves showed a tendency to bend towards the abscissa to form semicircles with their centers on the real axis, having comparatively larger radius showing an ideal Debye type behavior 32,33 . The radius of curvature of the arcs decreases with increasing temperature, which reveals that the conductivity of the sample increases as temperature increases and indicate also a negative temperature coe cient of resistivity (NTCR) behavior of the test materials 34,35 According to the impedance spectrum data obtained of Ba 1 − x Bi x Ti 0.80 Fe 0.20 O 3 ceramics at x = 0.00, 0.05, 0.10 and 0.15 at 400 °C of measurement temperature (Fig. 11) the Complex impedance spectrum of all the samples shows the presence of an arc of a circle with the center below the real axis indicating the contribution of both ceramic's boundaries and grain boundaries 36 .…”

Section: Electric Propertiesmentioning

confidence: 96%

Rietveld refinement and diffuse phases transition of Ba1-XBixTi0.8Fe0.2O3 ceramics at x=0.00, 0.05, 0.10 and 0.15 prepared by solid state method.

Gouitaa

Taj-dine

BOUAYAD

et al. 2020

Preprint

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The effect of substitution of Baryum by Bismut in site A and titanium by iron in site A on structural, physical and electrical properties of Ba1-xBixTi0.80Fe0.20O3 ceramics at (x=0.00, 0.05, 0.10 and 0.15) was investigated by X-ray diffraction, Scaning Electron Microscopy (SEM) as well as dielectric characterizations. The crystal phase was studied by using rietveld refinement. The result of rietveld refinement of X-ray powders diffraction of Ba1-xBixTi0.80Fe0.20O3 shows that these compounds crystallize in tetragonal (P4mm) and hexagonal (P63mmc) for x=0.00 and 0.05 while at x=0.10 and 0.15 the hexagonal phase disappears and the tetragonal phase is stabilized. The structural parameters and the R-factors of these ceramics were succefully determined by the rietveld refinement. The Raman spectra confirms the disappearance of hexagonal phase in benefit of tetragonal phase as the Bi substitution increases. The dielectric measurements as function of temperature are studied and showed tree diffuse phase transitions transition from the ferroelectric rhombohedral phase to the ferroelectric orthorhombic TR-O phase and the second one is from the ferroelectric orthorhombic phase to the ferroelectric TO-T tetragonal phase. While the third one at high temperatures is the phase transition from the ferroelectric tetragonal phase to the paraelectric cubic phase Tm. These phases transition were displaced to the lower temperature with increasing of Bi substitution. And the value of dielectric permittivity increases gradually with increasing of Bi2+ contents. All these phase transitions showed a diffused phenomenon which can be well described by fitting the modified Ushino relation, 1/ε’r = 1/ε’r,max [ 1+ ((T-Tm)/2δ)γ]. The complex impedance Cole–Cole plots showed negative temperature coefficient of resistivity (NTCR) behavior of the Ba1-xBixTi0.80Fe0.20O3 for x=0.05 to 0.15 materials and decrease in grain and grain boundaries resistivity. The relaxation behavior in the test materials is found to be of Debye type.

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NTC characteristic of SnSb0.05O2–BaTi0.8Fe0.2O3−δ composite materials

Cited by 10 publications

References 26 publications

Structural and dielectric properties of Ba0.95Bi0.05Ti1-xFexO3ceramics at x=0.0, 0.1 and 0.2 prepared by solid state method

Structural and dielectric properties of Ba0.95Bi0.05Ti1-xFexO3ceramics at x=0.0, 0.1 and 0.2 prepared by solid state method

Zr-substituted SnO2-based NTC thermistors with wide application temperature range and high property stability

Rietveld refinement and diffuse phases transition of Ba1-XBixTi0.8Fe0.2O3 ceramics at x=0.00, 0.05, 0.10 and 0.15 prepared by solid state method.

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