Manufacturing Industry

Scanning electron microscope reveals atomic-scale structures.(TESTING AND MEASUREMENT)

Advanced Ceramics Report, August, 2006

Researchers at Cornell University, USA, have developed a technique that allows them, for the first time, to see the polarity, or physical alignment, of constituent atoms in crystalline molecules.

Using the technique, called annular dark imaging, the researchers say they can better predict the physical properties of a crystal at every point--an advance that offers potential improvements in lasers and other devices, particularly at the nanoscale, where the structure of an individual molecule can determine a device's behaviour.

To observe the atoms, the researchers--led by Dr K. Andre Mkhoyan--used a scanning transmission electron microscope (STEM) on samples of aluminium nitride, gallium nitride and other crystals with particular significance in...

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