One of the major applications of neutron diffraction in mineral sciences has been in the study of order-disorder processes and phase transitions. Neutron scattering methods provide unique insights into the origins and mechanisms of these processes, and have enabled mineralogists to develop new models of phase transformation behavior. The time-temperature dependence of processes such as phase transformations, exsolution, cation ordering and disordering in minerals has considerable potential geophysical, geochemical and petrological importance. Let’s take atomic ordering as an example. Order-disorder transformations and similar structural phase transitions are typically some of the most efficient ways a mineral can adapt to changing...

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