• Title, Summary, Keyword: Vasil'ev

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Comparison of Ionic Equilibria Analysis of ZnSO4-Fe2(SO4)3-Na2SO4-H2SO4-NaOH-H2O System at 25℃ between Pitzer and Vasil'ev Equation (25℃에서 ZnSO4-Fe2(SO4)3-Na2SO4-H2SO4-NaOH-H2O계에 대해 Pitzer식과 Vasil'ev식에 의한 이온평형해석 비교)

  • Lee, Man-Seung;Lee, Kyoung-Ju;Nam, Sang-Ho
    • Analytical Science and Technology
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    • v.16 no.2
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    • pp.159-165
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    • 2003
  • To develop an ionic equilibria model applicable to the sulfuric acid leaching solutions of zinc oxide ore, the method of the Pitzer equation and that of the Vasil'ev equation were compared. As the ionic strength of the solution increased to 9 m, the results of ionic equilibria by the Pitzer equation were more accurate than those by Vasil'ev. To simulate the sulfuric acid leaching solutions of zinc oxide ore, the mixed solutions with the various composition of $ZnSO_4-Fe_2(SO_4)_3-Na_2SO_4-H_2SO_4-NaOH-H_2O$ were prepared. The pH values calculated in this study agreed well with those measured at $25^{\circ}C$.

New Methods in the Technology of Electroluminescent Phosphors

  • Sychov, M.M.;Bahmet'ev, V.V.;Khavanova, L.V.;Kuznetsov, A.I.;Smimov, A.;Vasil'eva, I.V.;Mjakin, S.V.;Nakanishi, Y.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1065-1070
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    • 2003
  • Controlling synthesis conditions of ZnS:Cu,Al and ZnS:Cu electroluminescent phosphors we optimized particle size, color properties and efficiency. Surface properties were studied by new method and showed correlation with luminescence as shown by the analysis of EL spectra with Fok-Alentsev method. Luminance and maintenance improvement was achieved by the electron-beam annealing due to additional decomposition of $ZnS-Cu_{2}S$ solid solution and formation of centers of blue luminescence.

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