Abstract
Formation of a homogeneous nanocrystalline CuIn0.7Ga0.3Se2 alloy was achieved by mechanical alloying of blended elemental Cu, In, Ga, and Se powders in a planetary ball mill. X-ray diffraction and transmission electron microscopy and diffraction techniques were employed to follow the structural evolution during milling. It was observed that, depending upon the milling conditions, either a metastable cubic or a stable tetragonal phase was produced. The grain size of the mechanically alloyed powder was about 10 nm. The mechanically alloyed powder was consolidated to full density by hot isostatic pressing the powder at 750 °C and 100 MPa for 2 h. Irrespective of the nature of the phase in the starting powder, the hot isostatically pressed compact contained the well-recrystallized tetragonal CuIn0.7Ga0.3Se2 phase with a grain size of about 50 nm.
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Suryanarayana, C., Ivanov, E., Noufi, R. et al. Phase selection in a mechanically alloyed Cu2013;In–Ga–Se powder mixture. Journal of Materials Research 14, 377–383 (1999). https://doi.org/10.1557/JMR.1999.0055
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DOI: https://doi.org/10.1557/JMR.1999.0055