Abstract
Surface of (NH4)3H(SeO4)2 crystals and its evolution in the course of the transition from the ferroelastic to the superprotonic phase were studied by optical polarization microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and energy-dispersive X-ray spectroscopy (EDXS). The morphology of fresh cleavage surfaces was examined. The composition and local electrical properties of the surface crystal layers were investigated. Local measurements of current-voltage curves and piezoresponse hysteresis loops were carried out. A transition to the phase with a superprotonic conductivity was proved to exist at T ≈ 308 K. A thin crystal layer of varying composition was found to form owing to topochemical reactions. Phase transformations and solid-state reactions at the crystal surface were analyzed based on the data obtained.
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