La2SmNi2O7 adopts a c-doubled monoclinic superstructure without a displacive CDW and transitions monoclinic→orthorhombic at 15 GPa then tetragonal at 21 GPa under pressure.
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Pressure-Driven Structural Transitions without a Displacive Charge-Density Wave in La$_2$SmNi$_2$O$_7$
La2SmNi2O7 adopts a c-doubled monoclinic superstructure without a displacive CDW and transitions monoclinic→orthorhombic at 15 GPa then tetragonal at 21 GPa under pressure.