Direct Evidence of Pretransformation Lattice Instabilities

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Abstract
Observations on lattice instability are demonstrated by transmission and diffraction electron microscopy together with an electron multiplier. The latter displays the coupled atomic fluctuations on an oscilloscope screen. The WKB method has been used to calculate a single-atom transition time. The results indicate that fluctuations should be present and that quantum mechanical considerations are important in the nucleation of solid-state phase transformation. A standing-wave model is suggested for the pretransition lattice instabilities and is experimentally supported.