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Isotropic negative area compressibility, which is very rare, is observed in KBBF and the related mechanism is investigated by combined high‐pressure X‐ray diffraction (XRD) experiments and first‐principles calculations. The strong mechanical anisotropy leads to a large Poisson's ratio and high figure of merit for the acoustic‐optics effect, giving KBBF potential applications as smart strain converters...
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