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LaMnO 3 – Ni 0.75 Mn 2.25 O 4 Supported Bilayer NTC Thermistors
Author(s) -
Zhao YongLi,
Zhao ChunHua,
Huang Juan,
Zhao Bing
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12870
Subject(s) - thermistor , materials science , bilayer , annealing (glass) , composite material , layer (electronics) , electrical resistivity and conductivity , composite number , analytical chemistry (journal) , electrical engineering , chemistry , biochemistry , membrane , chromatography , engineering
A bilayer concept was proposed to adjust the electrical properties of NTC thermistors. The conventional NTC material Ni 0.75 Mn 2.25 O 4 was chosen as the sensitive layer, and high conductive LaMnO 3 – Ni 0.75 Mn 2.25 O 4 composite was chosen as the support layer. The bilayer NTC thermistors were successfully fabricated by classical uniaxial pressing method. After cosintering at 1235°C for 4 h, the two layers adhered well to each other without any cracking or delamination. The resistance decreased linearly with the decrease in the thickness of Ni 0.75 Mn 2.25 O 4 layer, and the B values varied between 3868 and 3901 K. After annealing at 150°C in air for 500 h, the resistance shifts at 25°C were less than 1%, which mean that the bilayer NTC thermistors had high stability.