Crystals that can be made to twin under the influence of mechanical stress have been known for some time; neodymium pentaphosphate may become the basis of novel optical and acoustic devices.
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Maddox, J. Ferroelasticity comes of age. Nature 316, 481 (1985). https://doi.org/10.1038/316481a0
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DOI: https://doi.org/10.1038/316481a0