• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.13 no.2
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• pp.137-142
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• 2000

The sintering and electrical properties of YMnO3 bulk ceramics were investigated with Y/Mn ratios(Mn rich ;0.80/1.20, 0.90/1.10, 0.95/1.05, and Y rich ; 1.00/1.00, 1.05/0.95, 1.10/0.90). The crystal structure of samples showed a hexagonal structure, and the sample of Y/Mn = 0.95/1.05 indicated higher c-axis oriented peak than other samples. In the case of Mn rich samples, the grain sizes were about 7.8${\mu}{\textrm}{m}$ and they showed 95% of theoretical density. Whereas, in the case of Y rich samples, the grain sizes were about 2.3${\mu}{\textrm}{m}$ and they showed 86%. The dielectric constant and dissipation factor of the Mn rich samples were smaller than those of the Y rich samples. The samples of Y/Mn = 0.90/1.10 showed the lowest a dissipation factor, and their dielectric constant, dissipation factor and Curie temperature were 36, 0.0136 and 68$0^{\circ}C$, respectively.