• Title/Summary/Keyword: YMn$_3$

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Sintering and Dielectric of $YMnO_3$ Ceramics with the Effect of Y/Mn Ratio (Y/Mn의 혼합비에 따른 $YMnO_3$세라믹의 소결 및 유전특성)

  • 김재윤;김부근;김강언;정수태;조상희
    • 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.

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Synthesis of Multiferroic Nanocomposites by a Polyol Method

  • Shim, In-Bo;Pyun, Jeffrey;Park, Yong-Wook;Uhm, Young-Rang;Kim, Chul-Sung
    • Journal of Powder Materials
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    • v.14 no.3 s.62
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    • pp.180-184
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    • 2007

  • The material design and synthesis are of important to modem science and technology. Here, we report the synthesis of multifunctional nanomaterials with different properties: feroelecties $YMnO_3$ and multiferroic materials such as $CoFe_2O_4-YMnO_3,\;Fe_3O_4-YMnO_3,\;CoFe_2O_4-Cd_{0.85}Zn_{0.15}S,\;and\;Fe_3O_4-Cd_{0.85}Zn_{0.15}S$ nano-composites by using a chemical synthesis process. These results provide a simple and convenient synthesis process to produce multifunctional nanocomposites.

  • https://doi.org/10.4150/KPMI.2007.14.3.180 인용 PDF KSCI

Investigation of crystallinity and microstructure of $YMnO_3$ single crystal grown by floating zone method

  • Cho, N.T.;Kwon, D.H.;Shin, J.H.;Ahn, C.I.;Shim, K.B.
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.13 no.4
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    • pp.168-171
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    • 2003

  • $YMnO_{3}$ single crystals have been grown by a floating zone technique and the optimal growth conditions were investigated. Their crystallinity and microstructure were characterized by the chemical etch pit patterns, their distribution and the compositional difference depending on the G value. In particular, the microstructural feature was interpreted in terms of compositional deviation along radial direction on (1010) growth plane.

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