Schematic diagram of the XRD setup.
Changes in the lattice parameters, the averaged linear expansion, and of the tetragonal structure for polycrystalline BNT–6BT as a function of temperature. A discontinuous change in all the parameters presented is clearly discerned at about , which is analyzed to be due to a to phase transition. (The size of symbols used approximately reflects 95% confidence interval for each fitted peak.)
Surface plot (a) showing the evolution of selected XRD peaks for BNT–6BT perpendicular to the applied uniaxial stress. Due to the relatively weak intensity of the superlattice reflection, a magnified view of the peak is presented (b) illustrating the changes in the position and FWHM of reflection as a function of stress.
Stress-strain hysteresis curves for BNT–6BT polycrystalline specimens at various temperatures. The coercive stress (blue dot), onset stress (red triangle), remanent strain (green square), and initial compliance are labeled on the ferroelastic hysteresis curve at ; the direction of loading is indicated by the inset arrows.
Remanent and maximum strain as a function of temperature for polycrystalline BNT–6BT samples loaded under uniaxial compression to a maximum stress of −385 MPa.
(a) Compliance and (b) characteristic stresses (onset and coercive stress) as a function of temperature for BNT–6BT. The curve fit lines are meant only to guide the eye.
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