On the controlling mechanism of the lower turning point in the negative temperature coefficient regime

Fuel ◽  
2022 ◽  
Vol 315 ◽  
pp. 123184
Author(s):  
Ruiguang Yu ◽  
Jie Liu ◽  
Wenkai Liang ◽  
Biao Ma ◽  
Hewu Wang
Keyword(s):  
Temperature Coefficient ◽  
Turning Point ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Controlling Mechanism

Aging of iron manganite negative temperature coefficient thermistors

1998 ◽  
Vol 13 (5) ◽  
pp. 1238-1242 ◽  
Author(s):  
T. Battault ◽  
R. Legros ◽  
A. Rousset
Keyword(s):  
Temperature Coefficient ◽  
Spinel Structure ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Octahedral Sites ◽  
Before And After ◽  
Structural Equilibrium ◽  
Electrical Data

“Aging,” defined as the drift of resistance with temperature after 1000 h, was investigated for iron manganite temperature coefficient thermistors. For these devices, aging is relatively large, about 10%. The cationic distributions before and after aging were determined by Mössbauer spectroscopy. These distributions explain all the x-ray diffraction and correlated electrical data. The origin of the aging observed on iron manganites thermistors has been identified. It is due to the migration of Fe3+ ions from tetrahedral to octahedral sites of the spinel structure in order to reach a structural equilibrium.

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