<i>In situ</i> visualization of crystallization inside high temperature silicate melts

DOI PDF 被引用文献3件
  • Atul Srivastava
    Tohoku University 1 Department of Earth and Planetary Materials Science, Graduate School of Science, , Sendai 980-8578, Japan
  • Yuko Inatomi
    Japan Aerospace Exploration Agency 2 Institute of Space and Astronautical Science, , Sagamihara, Kanagawa 229-8510, Japan
  • Katsuo Tsukamoto
    Tohoku University 1 Department of Earth and Planetary Materials Science, Graduate School of Science, , Sendai 980-8578, Japan
  • T Maki
    Olympus Optical Co. 3 , Hachioji, Tokyo 192-8507, Japan
  • Hitoshi Miura
    Tohoku University 1 Department of Earth and Planetary Materials Science, Graduate School of Science, , Sendai 980-8578, Japan

説明

<jats:p>The present work is concerned with the real time in situ visualization of crystallization processes inside strongly supercooled silicate melts using optical projection technique. The crystallization experiments are carried out for forsterite composition under container-less conditions. Starting material is heated above its liquidus temperature (2169 K) using a high power CO2 laser and crystallization is initiated following rapid cooling. Three different values of supercooling (ΔT≈320, 400, and 500 K, calculated with respect to the liquidus temperature of forsterite composition as reference) are independently employed to initiate the nucleation process by adjusting the output power of CO2 laser. Primary findings of the study show that a suitably designed optical system is capable of imaging melt convection at temperatures as high as near liquidus and presents a novel approach for the prediction of resultant crystallization textures in real time nondestructively. Using the developed optical arrangement, formation of porphyritic-like textures and parallel-barred structures could be successfully visualized during the crystallization process. The results also reveal that for very large values of supercooling, it is possible to initiate nucleation from inside the melt droplet. The in situ predictions of resultant crystalline textures are compared with the textures revealed by photomicrographs of the corresponding thin sections and a good agreement is seen between the two observations.</jats:p>

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