International Journal of Nanoscience, Volume (10), No (3), Year (2011-9) , Pages (479-486)

Title : ( LOW TEMPERATURE SYNTHESIS AND ELECTRONIC PROPERTIES OF NTC TEMPERATURE SENSOR SPINEL-TYPE OXIDES NANOPOWDERS )

Authors: Mohammad Hosseini , boshra ghanbari shohani , , Ahmad Kompany ,

Citation: BibTeX | EndNote

NiCoxMn2-xO4 (x = 0:4; 0:8; 1:2; 1:6) thermistor with nanopowders have been synthesized by the auto-combustion method at low temperatures. The size and morphology of the calcinated powders have been investigated using XRD and TEM techniques. The average particle size was estimated to be about 65 nm in diameter with the cubic and cubic þ tetragonal phases for low and high cobalt concentrations, respectively. The grain size of NTC ceramics sintered at 1200C is veri¯ed with scanning electron microscopy (SEM) images. Upon increasing the cobalt concentration, the grain size of NTC samples increases from about 2 m to a few m in size. The formation of spinel structure of powders has been studied by Fourier transform infrared (FTIR) spectroscopy. An ab initio calculation of electronic properties of NiCo0:8Mn1:2O4 using full potential of the linear augmented plane wave (FP-LAPW) method has been performed. The results indicate that only the 3d-Mn orbitals play an important role in the conduction mechanism. The dependency of material resistivity constant (B) and temperature coe±cient () have been measured

Keywords

Solgel processes; electrical conductivity; spinels;
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@article{paperid:1024010,
author = {Hosseini, Mohammad and Ghanbari Shohani, Boshra and , and Kompany, Ahmad},
title = {LOW TEMPERATURE SYNTHESIS AND ELECTRONIC PROPERTIES OF NTC TEMPERATURE SENSOR SPINEL-TYPE OXIDES NANOPOWDERS},
journal = {International Journal of Nanoscience},
year = {2011},
volume = {10},
number = {3},
month = {September},
issn = {0219-581X},
pages = {479--486},
numpages = {7},
keywords = {Solgel processes; electrical conductivity; spinels; thermistors},
}

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%0 Journal Article
%T LOW TEMPERATURE SYNTHESIS AND ELECTRONIC PROPERTIES OF NTC TEMPERATURE SENSOR SPINEL-TYPE OXIDES NANOPOWDERS
%A Hosseini, Mohammad
%A Ghanbari Shohani, Boshra
%A ,
%A Kompany, Ahmad
%J International Journal of Nanoscience
%@ 0219-581X
%D 2011

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