Open AccessPreparation of Fe0.8Mn1.54Ni0.66O4 Nano-Ceramics by Sol-gel auto combustion and N2 Annealing for High Reliable NTC Thermistor
Author(s) -
Nam Chol Yu,
Il-Man Pak,
SonGuk Pak
Publication year - 2021
Publication title -
international journal of materials
Language(s) - English
Resource type - Journals
ISSN - 2313-0555
DOI - 10.46300/91018.2020.7.17
Subject(s) - spinel , thermistor , materials science , sintering , microstructure , ceramic , scanning electron microscope , annealing (glass) , combustion , metallurgy , sol gel , nano , composite material , analytical chemistry (journal) , mineralogy , nanotechnology , chemistry , chromatography , organic chemistry , electrical engineering , engineering
Fe0.8Mn1.54Ni0.66O4 nano-ceramics have been successfully prepared by sol-gel auto combustion. The microstructure and phase of these samples was observed by using Scanning Electron Microscopy and X-Ray Diffraction. The diameters of Fe0.8Mn1.54Ni0.66O4 ceramic particles pre-fired at 800℃ range from 52 to 83nm. The powder sintered at above 1050℃ 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℃ is sufficient to form the appropriate spinel phase. Moreover, the thermistor annealed for 72h at 450~550℃ in N2 atmosphere has the drift value of <0.7%.