• Title/Summary/Keyword: Bi-stable

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Crystallization from The Melt of 6Bi2O3.GeO2 Composition (6Bi2O3.GeO2 조성 융액의 결정화)

  • 김호건;김명섭
    • Journal of the Korean Ceramic Society
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    • v.26 no.4
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    • pp.479-486
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    • 1989
  • According to the phase diagram, 6Bi2O3.GeO2 composition melts congruently at 93$0^{\circ}C$ and forms a stable ${\gamma}$-6Bi2O3.GeO2 crystal phase below the melting point. But when the melt of this composition was cooled at a rate 1-15$0^{\circ}C$/min without tapping by a glass rod or impurity addition, a metastable $\delta$-6Bi2O3.GeO2 crystal phase was formed. It is due to that as the nucleation energy barrier of $\delta$-6Bi2O3.GeO2 crystals, which have more open and defective structure, is lower than that of ${\gamma}$-6Bi2O3.GeO2 crystals. When impurities or ${\gamma}$-6Bi2O3.GeO2 crystals existed in the melt, stable ${\gamma}$-6Bi2O3.GeO2 crystal phase was formed at various cooling rate. It is because of that the impurities or the ${\gamma}$-6Bi2O3.GeO2 crystals role as a seed crystal and as a result the nucleation energy barrier of ${\gamma}$-6Bi2O3.GeO2 crystals is lowered.

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Phase Stability of Bi-2212 and Bi-2223 Thin Films Prepared by IBS Technique

  • Yang, Sung-Ho;Park, Yong-Pil
    • Transactions on Electrical and Electronic Materials
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    • v.2 no.1
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    • pp.12-15
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    • 2001
  • Bi-2212 and Bi-2223 thin films are prepared by IBS(ion beam sputtering) technique. Three phases of Bi-2201, Bi-2212 and Bi-2223 appear as stable ones in spite of the conditions for thin film fabrication of Bi-2212 and Bi-2223 compositions, depending on substrate temperature (T $_{sub}$) and ozone pressure(PO$_3$). It is found out that these phases are limited within very narrow temperature.e.

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Thermodynamics for Formation of Each Stable Single Phase in BSCCO Thin Films

  • Yang, Sung-Ho;Park, Yong-Pil;Kim, Gwi-Yeol
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2000.11a
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    • pp.104-105
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    • 2000
  • High quality BSCCO thin films have been fabricated by means of an ion beam sputtering at various substrate temperatures, T$_{sub}$, and ozone gas pressures, PO$_3$. The correlation diagrams of the BSCCO phases appeared against T$_{sub}$ and PO$_3$are established in the 2212 and 2223 compositional films. In spite of 2212 compositional sputtering, Bi2201 and Bi2223 phases as well as Bi2212 one come out as stable phases depending on T$_{sub}$ and PO$_3$. From these results, the thermodynamic evaluations of ΔH and ΔS which are related with Gibbs'free energy change for single Bi2212 or Bi2223 phase are performed.ormed.i2212 or Bi2223 phase are performed.

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Thermodynamics for Formation of Each Stable Single Phase in Bi-superconductor Thin Films

  • Park, Yong-Pil;Kim, Gwi-Yeol
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.14 no.1
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    • pp.64-68
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    • 2001
  • High quality BSCCO thin films have been fabricated by means of an ion beam sputtering at various substrate temperatures, T$\_$sub/, and ozone gas pressures, PO$_3$. The correlation diagrams of the BSCCO phases appeared against T$\_$sub/ and PO$_3$ are established in the 2212 and 2223 compositional films. In spite of 2212 compositional sputtering, Bi2201 and Bi2223 phases as well as Bi2212 one come out as stable phases depending on T$\_$sub/ and PO$_3$. From these results, the thermodynamic evaluations of ΔH and ΔS, which are related with Gibbs' free energy change for single Bi2212 or Bi2223 phase are performed.

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Driver electronics for commercialization of emerging display technologies

  • Wai-Yan, Stephen
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.298-302
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    • 2006
  • Driver electronics for emerging display technologies are presented for OLED's, microdisplays, electrophoretic displays & bi-stable LCD's. Key factors for commercialization of these technologies are derived from the experience of the LCD's, including driver IC designs, wafer and assembly processes & applications.

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Thermodynamics for Formation of Each Stable Single Phase in BSCCO Thin Films

  • Yang, Sung-Ho;Park, Yong-Pil;Kim, Gwi-Yeol
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.11a
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    • pp.104-107
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    • 2000
  • High quality BSCCO thin films have been fabricated by means of an ion beam sputtering at various substrate temperatures, T$\_$sub/, and ozone gas pressures, PO$_3$. The correlation diagrams of the BSCCO Phases appeared against T$\_$sub/ and PO$_3$ are established in the 2212 and 2223 compositional films. In spite of 2212 compositional sputtering, Bi2201 and Bi2223 phases as well as Bi2212 one come out as stable phases depending on T$\_$sub/ and PO$_3$. From these results, the thermodynamic evaluations of ΔH and ΔS which are related with Gibbs' free energy change for single Bi2212 or Bi2223 phase are performed.

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Bi-Stable and Wide Temperature-Range Electrowetting Displays

  • Blankenbach, K.;Schmoll, A.;Bitman, A.;Bartels, F.;Jerosch, D.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08b
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    • pp.1757-1760
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    • 2007
  • Moving a droplet by electrowetting is the basis of our novel displays. This enables mechanical bistable and high reflective monochrome as well as color systems. Since no high temperature process is required, plastic substrates can be used. Our prototypes show promising performance in terms of a wide temperature range, contrast ratio and color.

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Effects of structure of Organic Bi-stable Device on the memory characteristics (유기쌍안정소자의 구조가 메모리특성에 미치는 영향)

  • Lee, Jae-June;Kong, Sang-Bok;Hwang, Sung-Beom;Song, Chung-Kun
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.483-484
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    • 2006
  • In this paper, we fabricated the organic bi-stable devices under the different condition from the other groups and analyzed the electrical characteristics. Then we investigated the effects of the device structure such as organic layer thickness, middle metal layer thickness and middle metal layer deposition rate on the memory characteristics.

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Stability Analysis of Marangoni Convection for $NH_3\;-H_2O$ Absorption Process (전파이론을 통한 $NH_3\;-H_2O$ 흡수과정의 마란고니 대류 안정성 해석)

  • 최창균;김제익;강용태
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.6
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    • pp.450-455
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    • 2002
  • Convective instability driven by surface tension is analyzed in an initially quiescent water absorbing ammonia gas using the linear stability theory. The propagation theory is adapated to find the critical conditions of the onset of solutal Maragoni convection. In this theory, the solutal penetration depth is chosen as the length scale factor. The results show that the liquid layer becomes more stable with decreasing the Schmidt number It is interesting that for a smaller Biot number than 100, the system becomes stable with decreasing Bi but for a larger Bi, it becomes unstable with decreasing Bi.