Effect of Cr addition on the structure and electrical properties of CaCu3Ti4O12 NTC thermistor

2021 ◽  
pp. 161066
Author(s):  
Guangtan Miao ◽  
Ming Yin ◽  
Peng Li ◽  
Jigong Hao ◽  
Wei Li ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Ntc Thermistor ◽  
Cr Addition

Effect of Nb2O5 Addition to the Electrical Properties of Fe2TiO5 Ceramics-Based NTC Thermistor

2015 ◽  
Vol 827 ◽  
pp. 262-265 ◽  
Author(s):  
Wiendartun ◽  
Risdiana ◽  
Fitrilawati ◽  
Rustam E. Siregar
Keyword(s):  
Activation Energy ◽  
Grain Size ◽  
Electrical Properties ◽  
Electrical Resistance ◽  
Single Phase ◽  
Mixed Powder ◽  
Ntc Thermistor ◽  
Constant Activation Energy

The aims of this research is to identify the effect of Nb2O5addition on the electrical properties of Fe2TiO5ceramics-based NTC thermistor.The concentration of Fe2O3and TiO2was proportional to Fe2TiO5, whereas the concentration value of Nb2O5were 0, 0.5 and 1.0 mole %, respectively. Within two hours, the mixed powder was pressed at 4 ton/cm2to form pellets and sintered at 1300 °C in air. It can perceived from the XRD data that the sintered ceramics had single phase of Fe2TiO5, pseudobrookite. From SEM data, it is found that addition of Nb2O5decreases the grain size. The addition of Nb2O5increases thermistor constant, activation energy and electrical resistance of Fe2TiO5ceramics. The values of thermistor constant of Nb2O5added-Fe2TiO5ceramics were relatively large, indicated that the ceramics were aplicable as the NTC thermistor.

scholarly journals Geometrical and electrical properties of NTC polycrystalline thermistors vs. Changes of sintering parameters

2006 ◽  
Vol 38 (3) ◽  
pp. 223-229 ◽  
Author(s):  
S.M. Savic ◽  
O.S. Aleksic ◽  
P.M. Nikolic ◽  
D.T. Lukovic
Keyword(s):  
Electrical Properties ◽  
Particle Diameter ◽  
Volume Resistivity ◽  
Average Particle ◽  
Microstructure Development ◽  
Average Particle Diameter ◽  
Oxide Mixture ◽  
Ntc Thermistor ◽  
Small Disc ◽  
Sintering Conditions

NTC thermistor powder was made of a Mn, Ni, Fe and Co oxide mixture calcinated at 1050?C / 60 min. The powder was milled in a ball mill down to an average particle diameter of 0.9 ?m. Small disc shaped pills of the powder obtained were made by pressing with a pressure of 2.5 MPa. The pills were sintered in the temperature range of 900-1400 ?C for 30-240 min. The volume and specific volume resistivity change were measured as a function of sintering conditions. Microstructure development was observed using a SEM microscope. Using the results obtained, optimization of sintering parameters was performed in order to determine optimal electrical properties of the selected thermistor composition.

Cationic Distribution and Electrical Properties of Ni0.6Mn2Si0.4-xAlxO4 (0≤x≤0.04) NTC Thermistor

2016 ◽  
Vol 868 ◽  
pp. 79-83
Author(s):  
Sen Liang ◽  
Xiao Zhang ◽  
Hai Bo Li ◽  
Mang Mang Gao ◽  
Jin Li
Keyword(s):  
Electrical Properties ◽  
Tetrahedral Site ◽  
Negative Temperature ◽  
Solid State Reaction Method ◽  
Molar Content ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Valence States ◽  
Cationic Distribution ◽  
Ntc Thermistor

Negative temperature coefficient (NTC) ceramics with general composition Ni0.6Mn2Si0.4-xAlxO4 (0≤x≤0.04) were prepared by conventional solid-state reaction method and were investigated for cationic distribution and electrical properties. X-ray diffraction (XRD) confirmed that the Si cations occupied the tetrahedral site. The valence states of Mn ions were characterized by X-ray photoelectron spectral (XPS). The results showed that Mn4+ content decreased from 0.19 mol to 0.185 mol when the Si molar content declined from 0.4 to 0.1, i.e. the content of Mn4+ was 0.197mol when x was equal to 0.4. Besides, the resistivity (ρ25) reached the minimum value when the Si molar content was 0 (ρ25=4.07×104Ω·cm).

Effect of V2O5 Additive on the Microstructure and Electrical Properties of Mn-Co-NiO NTC Thermistor

2007 ◽  
Vol 336-338 ◽  
pp. 743-745
Author(s):  
Wei Min Wang ◽  
Xiang Chun Liu ◽  
Ming Zhao ◽  
Chang Sheng Tian
Keyword(s):  
Electrical Properties ◽  
Spinel Phase ◽  
Material Constant ◽  
Electron Configuration ◽  
Cell Enlargement ◽  
Outer Electron ◽  
Ntc Thermistor ◽  
Ntc Thermistors

The aim of this paper is to investigate the effects of V2O5 additive on the electrical properties of NTC thermistors based on Ni0.5Co0.5Mn2O4.The XRD analyses indicate that single spinel phase can form, and V2+ions are in the octahedral interspace. The cell can be enlarged due to the V2O5 additive. The resistivities (ρ) and the material constant (B) increase obviously, the reasons of which are mainly attributed to the outer electron configuration of V2+ and cell enlargement.

Structural and electrical properties of Mn1.56Co0.96Ni0.48O4 NTC thermistor films

2014 ◽  
Vol 185 ◽  
pp. 74-78 ◽  
Author(s):  
Y.Q. Gao ◽  
Z.M. Huang ◽  
Y. Hou ◽  
J. Wu ◽  
W. Zhou ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Structural And Electrical Properties ◽  
Ntc Thermistor
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