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Development of new gallium cell s

Development of new gallium cell s. Euromet Project 732, WP 4. Slovak Institute of Metrology J. Ranostaj ( ranostaj@smu.gov.sk ) S. Ďuriš,. Objective: To develop a new generation of cells at the Gallium fixed point. Workpackage 4 Gallium melting point. Pilot Laboratory: SMU

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Development of new gallium cell s

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  1. Development of new gallium cells Euromet Project 732, WP 4 Slovak Institute of Metrology J. Ranostaj (ranostaj@smu.gov.sk ) S. Ďuriš,

  2. Objective: To develop a new generation of cellsat the Galliumfixed point Workpackage 4Gallium melting point Pilot Laboratory: SMU Participants: FE-LMK, METAS, CMI, Cooperating laboratory: VNIIM

  3. Reviewof up to date activities • Review of WP 4 possibilities • Collection of information related to gallium fixed point (literature retrieval) • Realization of cells • selection of supplier and purchase of the gallium • chemical analysis • cell design • cleaning procedure • filling procedure • manufacturing of the cells – under process

  4. Review of WP 4 posibilities

  5. Cells realization • Gallium • Supplier: CMK, Ltd. (Slovakia) • Charge No.: 2004057 • Purity: 7N • Quantity: 1.1 Kg (2x0.5 Kg, 4x0.025 Kg) • Analyze: • GDMS, CMK, Ltd. • GDMS, Shiva Technologies Europe (France) • Supplier: CMK, Ltd. (Slovakia) • Charge No.: 2006041 • Purity: 7N – MBE Grade • Quantity: 1.1 Kg (2x0.5 Kg, 4x0.025 Kg) • Analyze: • GDMS, CMK, Ltd. • GDMS, Shiva Technologies Europe (France)

  6. Detection limits of some GDMS analytical laboratories (ppb wt)

  7. GDMS analysis of Ga 7N (ppb wt)

  8. GDMS analysis of Ga 7N–MBE Grade (ppb wt)

  9. Design of the cells

  10. Cleaning of the container and filling of the cells • Cleaning procedure for teflon crucible and cap • Washing with detergent • Rinsing and ultrasonic washing with distilled water • Washing with watered-down aqua regia • Rinsing with vapour of redistilled water • Heating in argon atmosphere

  11. Future activities • Finalization of prototype cells • Comparison of prototype cells with SMU primary standard gallium point cell (used in CCT-K3 and Euromet No.: 552) • Study of gallium phase transition realized by prototype cells • pressure effect on the temperature of phase transition • effect of different method and effect of thermodynamic conditions of realization • effect of preceding freezing • effect of moisture • ... • Comparison of gallium point realization by different NMIs

  12. Thank you for your attention

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