Heating-induced negative temperature coefficient effect in conductive graphene/polymer ternary nanocomposites with a segregated and double-percolated structure

2017 ◽  
Vol 5 (32) ◽  
pp. 8233-8242 ◽  
Author(s):  
Shuaiguo Zhao ◽  
Dandan Lou ◽  
Pengfei Zhan ◽  
Guojie Li ◽  
Kun Dai ◽  
...  
Keyword(s):  
Temperature Coefficient ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Ntc Effect ◽  
Uhmwpe Composite

A NTC effect has been developed upon heating in a ternary graphene/PA6/UHMWPE composite with a segregated and double-percolated structure.

Suppressing the negative temperature coefficient effect of resistance in polymer composites with positive temperature coefficients of resistance by coating with parylene

2020 ◽  
Vol 8 (22) ◽  
pp. 7304-7308 ◽  
Author(s):  
Chihiro Okutani ◽  
Tomoyuki Yokota ◽  
Ryotaro Matsukawa ◽  
Takao Someya
Keyword(s):  
Temperature Coefficient ◽  
Polymer Composites ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Temperature Coefficients ◽  
Ntc Effect

Thin parylene coating suppressed the negative temperature coefficient (NTC) effect of polymer thermistors with a positive temperature coefficient (PTC) while maintaining the PTC characteristics.

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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