• Title/Summary/Keyword: 분말합성

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A Study on the Preparation of $ZnGa_{2}O_{4}$ by Polymerized Complex Method and Solution Combustion Method (착체중합법 및 연소합성법에 의한 $ZnGa_{2}O_{4}$ 합성에 관한 연구)

  • Jun, Ae-Kyoung;Ryu, Ho-Jin;Park, Hee-Dong;Lee, Ik-Mo
    • Korean Journal of Materials Research
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    • v.8 no.7
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    • pp.616-620
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    • 1998

  • Zn_{0.994}Mn_{0.006}Ga_2O_4$ green phosphor powders were synthesized using polymerized complex and solution combustion methods, and their powder and luminescence properties were characterized by XRD, SEM, BET, PL, etc. The properties were compared with those of the powders prepared by a solid state reaction method. The powders prepared by polymerized complex and solution combustion methods showed only a single spinel phase at 50$0^{\circ}C$ and 40$0^{\circ}C$, respectively. Their particle sizes were smaller than that of a solid state reaction method. Emission intensity of the phosphor powders prepared by both methods were highest at 90$0^{\circ}C$ and 40$0^{\circ}C$, respectively.

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Electrical and Optical Properties of Grain-Oriented (Pb, Ba, La) $Nb_2O_6$ Piezoelectric Ceramics (입자배향(Pb, Ba, La) $Nb_2O_6$ 압전세라믹스의 제작 및 그 전기적.광학적 특성)

  • 남효덕;조상희;영전방유
    • Journal of the Korean Ceramic Society
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    • v.25 no.3
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    • pp.268-276
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    • 1988

  • Ba or La-Substituted lead niobate $(Pb_{1-x}Ba_x)_{1-y}La_{2y/3}Nb_2O_6$(PBLN), powders having needle shape are prepared by flux method using KCl and the effect of Ba or La substitution on morphology of obtained powders is examined. From these needle shape powders, grain-oriented ceramics are made by doctor-blade method and two-stage hot-pressing technique. The dielectric, piezoelectric and optical properties of the ceramics are also investigaated. Heating condition and the amount of substituted Ba or La have remarkable effects have large anisotropy in both permittivity and coupling factor depending on the pressing direction.

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