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Ab initio calculations have been carried out using the FP-APW+lo method in order to understand the atomic origin of the inverse piezoelectric effect in α-quartz. The external electric field was modelled by a saw-like potential V ext in order to achieve translational symmetry within a supercell (SC) containing 72 atoms. The original trigonal quartz structure was repeated along the [110] direction,...
In order to understand the atomistic origin of the inverse piezoelectric effect in α-SiO2 and α-GaPO4 we have measured the changes of integrated X-ray intensities of selected Bragg reflection under influence of an external high electric field up to 8 kV/mm. To do this 300 µm thick samples were sandwiched between metallic contacts and the X-ray intensities were recorded with and without the applied...
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