Mercury cadmium telluride (MCT) has been directionally solidified for ten days in the Advanced Automated Directional Solidification Furnace (AADSF) on the second United States Microgravity Payload Mission (USMP-2). A second growth experiment is planned for the USMP-4 mission in November 1997. Results from USMP-2 demonstrated significant changes between microgravity and ground-based experiments, particularly in the compositional homogeneity. Changes were also observed during the microgravity mission which were dependent on the attitude of the space shuttle and the relative magnitudes of axial and transverse residual accelerations with respect to the growth axis of the crystal. Issues of shuttle operation, especially those concerned with safety and navigation, and the science needs of other payloads dictated the need for changes in attitude. One consequence for solidification of MCT in the USMP4 mission is the desire for a shorter growth time to complete the experiment without subjecting the sample to shuttle maneuvers. By using a seeded technique and a pre-processed boule of MCT with an established diffusion layer quenched into the solid, equilibrium steady state growth can be established within 24 hours, rather than the three days needed in USMP-2. The growth of MCT in AADSF during the USMP-4 mission has been planned to take less than 72 hours with 48 hours of actual growth time. A review of the USMP-2 results will be presented, and the rationale for the USMP-4 explained. Pre-mission ground based tests for the USN4P-4 mission will be presented, as will any available preliminary flight results from the mission.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Directional Solidification of Mercury Cadmium Telluride in Microgravity


    Beteiligte:

    Kongress:

    Experimental Methods for Microgravity Materials Science ; 1998 ; San Antonio, TX, United States


    Erscheinungsdatum :

    01.01.1998


    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Designers still choose mercury cadmium telluride

    Piotrowski, J. / Perry, F. | British Library Online Contents | 1997


    THz Emission from Mercury Cadmium Telluride Films Grown on Cadmium Zinc Telluride Substrates

    Mendis, R. / Smith, M. L. / Vickers, R. E. M. et al. | IEEE | 2006


    Directional Solidification Using a Baffle in Microgravity

    Vogel, Michael J. | Online Contents | 2001


    Directional solidification in the Microgravity Science Glovebox

    Ostrogorsky, A. / Marin, C. / Cummings, T. et al. | AIAA | 2002


    Mercury cadmium-telluride photodiodes and focal plane arrays

    Bovina, L. A. / Stafeev, V. I. / Russian Federation RD &P Centre ORION; State Scientific Centre | British Library Conference Proceedings | 1999