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.

Novel electrical properties of Mn-doped LaCrO3 ceramics as NTC thermistors

2021 ◽  
pp. 159269
Author(s):  
Fang Guan ◽  
Zewei Dang ◽  
Xuan Chen ◽  
Shifeng Huang ◽  
Jianrong Wang ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Ntc Thermistors ◽  
Mn Doped

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.

scholarly journals Cu-Mn Co-doped NiFe2O4 based thick ceramic film as negative temperature coefficient thermistors

2021 ◽  
Vol 882 (1) ◽  
pp. 012017
Author(s):  
A Hardian ◽  
S Greshela ◽  
T Yuliana ◽  
S Budiman ◽  
A Murniati ◽  
...  
Keyword(s):  
Temperature Coefficient ◽  
Transition Metal Oxides ◽  
Negative Temperature Coefficient ◽  
Spinel Phase ◽  
Thick Films ◽  
Synthesis Method ◽  
Negative Temperature ◽  
Ceramic Film ◽  
Ntc Thermistors ◽  
Co Doped

Abstract NTC (Negative Temperature Coefficient) thermistors are widely used as temperature sensors in industrial and medical applications due to their high-temperature sensitivity, durability, and low cost. Generally, NTC thermistors are made from spinel structured ceramics formed by transition metal oxides with the general formula AB2O4. One of the spinel structured ceramics that can be made for NTC thermistors is NiFe2O4 nanoparticles. This work aimed to prepare Cu-Mn co-doped NiFe2O4 based thick ceramic film using Jarosite mineral as a precursor. The synthesis method used was a simple coprecipitation method, while the technique used in making a thick ceramic film was a simple screen printing technique. The sintering temperatures used were 1000 °C, 1100 °C, and 1200 °C. Based on x-ray diffraction analysis, the thick films consist of spinel phase, hematite phase, and some unidentified phase. The constant thermistor values (B) for thick films obtained with 1000, 1100, and 1200 °C sintering temperatures were 4740 K, 5669 K, and 5731 K, respectively. These results showed that all obtained thick films had passed the minimum value in market needs (B ≥2000 K).

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