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Density functional theory is used to estimate the e11 and d11 piezoelectric elements in the trigonal form of BiPO4. The calculated values, e11=-1.46C/m2 and d11=-22.84pC/N at 0K, are significantly higher than those predicted in α-quartz-type materials but require experimental confirmation. The polar E-modes below 100cm−1 are at the origin of the piezoelectric efficiency.
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