Steep slopes of the dynamical X-ray diffraction curves can be utilized for the determination of homogeneous elastic strains produced by electric potential, hydrostatic pressure etc. The principle of the new method is explained with some dynamical effects of the X-ray diffraction. The sensitivity is estimated by using the intrinsic rocking curves of the Bragg-case diffraction and is found to be suitable for the strains from 5×10
-6 to 5×10
-8 experimentally.
A three-crystal spectrometer is convenient in the experimental procedure. Piezoelectric constants of α-quartz and KDP and also electrostrictive constant and linear compressibility of α-quartz were measured with the spectrometer.
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