Abstract
We found that ultrafine chromium (Cr) particles prepared in UHV condition have an A15 type structure different from their bulk crystals by UHV high-resolution transmission electron microscopy (JEM 2000FXV). Cr (99.999% purity) was evaporated in situ in the UHV microscope by electron beam heating to various diameters ranging from 5 to 20 nm onto an amorphous carbon substrate kept at 600°C. Diffraction patterns of the Cr particles showed the (200), (210) and (211) spots expected from the A15 type structure, while they showed no diffraction spots from the bcc structure. From the high-resolution images of the Cr particles, showing the (110), (111), (200) and (220) lattice fringes of the A15 type structure, we confirmed that the stable phase of the clean ultrafine Cr particles has an A15 type structure.
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