PASADENA, Calif.—They shrink when you heat 'em. Most materials expand when heated, but a few contract. Now engineers at the California Institute of Technology (Caltech) have figured out how one of ...
The crystal structure of ScF3. Scandium atoms are green while fluorine atoms are white. You can imagine the bonds connecting the atoms as springs. In the so-called quartic oscillations of ScF3, a ...
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