Preparation routes and electrical properties for Ni0.6Mn2.4O4 NTC ceramics
Ni 0.6 Mn 2.4 O 4 negative temperature coefficient ceramics were prepared by using solid-state coordination reaction and traditional solid-state methods, their structures and properties were characterized by using scanning electron microscopy, powder X-ray diffractometer and temperature dependent re...
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Published in | Journal of materials science. Materials in electronics Vol. 26; no. 9; pp. 7238 - 7243 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.09.2015
|
Subjects | |
Online Access | Get full text |
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Summary: | Ni
0.6
Mn
2.4
O
4
negative temperature coefficient ceramics were prepared by using solid-state coordination reaction and traditional solid-state methods, their structures and properties were characterized by using scanning electron microscopy, powder X-ray diffractometer and temperature dependent resistivity test. For solid-state reaction powders, the calcination temperature necessary for formation of the spinel phase was 1000 °C, which is 300 °C higher than that of solid-state coordination reaction powders. Regardless of preparation routes, the ceramics were crystallized in a single cubic spinel structure when the sintering temperature was lower than or equal to 1150 °C, Mn
3
O
4
impurity phase was detected when the sintering temperature raised to 1200 °C. Having higher densities and bigger grain sizes, the solid-state coordination reaction samples had smaller room temperature resistivities and larger
B
25/50
values as compared with those of solid-state samples. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-015-3350-3 |