ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The secondary phases in ZnO varistor materials, having Bi2O3, Sb2O3, MnCO3 and CoO as additives, were investigated using transmission electron microscopy with an energy dispersive X-ray spectrometer and X-ray diffractometer scans. The information about the morphology of the pyrochlore phase and its formation reaction were obtained. The pyrochlore phase is formed from the reaction between the spinel and Bi2O3 phase. Below 1200° C, the spinel phase reacts with the liquid Bi2O3 phase present at the multiple grain junction and forms the pyrochlore phase. The pyrochlore phase nucleates at the corners of multiple grain junction adjacent to the spinel grain and grows towards the centre of the grain junction.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00660935
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