Thermal expansion studies using powder diffraction methods require long measurement time at classical sources. This can be improved by using combination o synchrotron X-ray source with a position sensitive counter. Experimental setting of this type should enable wavelength calibration, in order to eliminate possible, even small, wavelength instabilities: this goal can be achieved using a suitable internal standard . In this presentation, examples of unit-cell size dependence on temperature determined at synchrotron beamlines with the use of linear imaging plate detectors will be demonstrated. The measurements were carried out at powder diffractometers at the B2 beamline at Hasylab/DESY (Hamburg, Germany)  and at I711 beamline at MAXlab Laboratory (Lund, Sweden) . For structure refinement, the Fullprof program  was applied. Using the position sensitive detectors is found to ascertain a fst and accurate determination of thermal expansion behavior.
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