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).

Theoretical and Experimental Investigation of Thermal Dynamics of Steinhart–Hart Negative Temperature Coefficient Thermistors

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Hooman Fatoorehchi ◽  
Mahdi Alidadi ◽  
Randolph Rach ◽  
Abolfazl Shojaeian
Keyword(s):  
Temperature Coefficient ◽  
Decomposition Method ◽  
Negative Temperature Coefficient ◽  
Adomian Decomposition Method ◽  
Negative Temperature ◽  
Differential Algebraic Equations ◽  
Thermal Dynamics ◽  
Average Absolute Relative Error ◽  
Adomian Decomposition ◽  
Ntc Thermistors

The temperature-dependent dynamics of a negative temperature coefficient (NTC) thermistor conducting variable electric current is modeled using the differential approach. The thermistor is assumed to follow the Steinhart–Hart resistance-temperature equation. The developed mathematical model consists of a nonlinear differential-algebraic equations system, and it was analyzed by the Adomian decomposition method (ADM) and its time-marching version known as the multistage Adomian decomposition method (MADM) as well as the Dormand–Prince (DP) numerical method. Five sets of experiments were conducted on five different NTC thermistors and the laboratory measurements were compared with the model predictions. It is demonstrated that the proposed model, when combined with the MADM, can accurately simulate the thermal behavior of the NTC thermistors. The MADM reproduces the experimental temperature dynamics of the five NTC thermistors with an average absolute relative error of about 2.601% while the corresponding errors for the DP method and the classic ADM are 8.122% and 51.255%, respectively. Also, it is shown that the MADM is highly efficient in terms of computational efficiency and it is approximately 6.5 times faster than the classic DP method, when tuned appropriately.

NTC Ceramics: Past, Present and Future

2010 ◽  
Vol 67 ◽  
pp. 124-133 ◽  
Author(s):  
Antonio Feteira ◽  
Klaus Reichmann
Keyword(s):  
Temperature Coefficient ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Commercial Success ◽  
Scientific Curiosity ◽  
Technological Advances ◽  
Samuel Ruben ◽  
Ntc Thermistors

In contrast with metals, the resistivity of ceramics decreases with increasing temperatures. This phenomenon was first discovered in 1833 by Faraday and remained a mere scientific curiosity until 1930, when Samuel Ruben proposed the fabrication of a pyrometer device, which explored the negative temperature coefficient (NTC) of resistance exhibit by Cu2O. Eight decades later, NTC ceramic thermistors constitute an important business segment for most electroceramic manufacturers. Here, we present a review of the most significant scientific and technological advances, which lead to the enormous commercial success of NTC thermistors. This review concludes with an outlook into future possible applications of NTC ceramics, providing that some current technological shortcomings (such as ageing) are resolved.

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