https://www.selleckchem.com/pr....oducts/elexacaftor.h
In a low-dimensional layered piezoelectric material such as CuInP_2S_6, the internal-strain term is approximately zero. This is because the internal structure of the molecular layers, which are bonded by the weak van der Waals interaction, responds little to the strain. As a result, the magnitude of the dipole, which depends strongly on the dimension and structure of the molecular layer, also has a small response with respect to strain. An equation bridging the internal strain responses in low-dimensional and three-dimensional piezo
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