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XRD traces for ALT with . The inset further enlarges the XRD trace for with between 66° and 69°, showing the splitting of diffraction peaks.
for ALT with measured at 1 MHz upon cooling and heating. The inset depicts the hysteretic loop obtained at 0.1 Hz for ALT with at 77 K.
The plot of as a function of for ALT with . The dashed-dotted line shows the fitting to the quantum ferroelectric relation.
The dependence of lattice parameter (a) and the interaxial angle (b) at room temperature determined for the primitive rhombohedral unit cell of ALT, respectively. The dashed lines indicate the eye guides.
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