Open AccessImproving the stability of Fe0.8Mn1.54Ni0.66O4 NTC thermistor with nano-powders and N2 annealing
Author(s) -
Nam Chol Yu,
Il Man Pak,
Son Guk Pak,
Jin Sim Kim
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/aba146
Subject(s) - thermistor , spinel , materials science , sintering , microstructure , ceramic , analytical chemistry (journal) , atmospheric temperature range , metallurgy , phase (matter) , mineralogy , nano , composite material , electrical engineering , chemistry , physics , organic chemistry , chromatography , meteorology , engineering
Fe 0.8 Mn 1.54 Ni 0.66 O 4 nano-ceramics have been successfully prepared by sol-gel auto combustion. The microstructure and phase of these samples were observed by using SEM and XRD. The diameters of Fe 0.8 Mn 1.54 Ni 0.66 O 4 ceramic particles pre-fired at 800 °C range from 52 to 83 nm. The powder sintered at above 1050 °C has the compact and uniform spinel structure. We have investigated the electrical characteristics of these thermistors at different sintering temperatures and concluded that the sample sintered at 1200 °C is sufficient to form the appropriate spinel phase. Moreover, the thermistor annealed for 72 h at 450 ∼ 550 °C in N 2 atmosphere has the drift rate of <0.7%.