Domain walls are natural borders in ferromagnetic, ferroelectric or ferroelastic materials. It seems that they can also be reactive areas that produce crystallographic phases never before observed in bulk materials. See Letter p.379
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Ghosez, P., Triscone, JM. Reactive walls. Nature 515, 348–350 (2014). https://doi.org/10.1038/515348a
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DOI: https://doi.org/10.1038/515348a
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