Abstract
Complex studies of new superprotonic crystals - acidic salts of potassium – ammonium sulfate (K1-x(NH4)x)3H(SO4)2, x ≥ 0.57 were carried out. Data on surface morphology, domain structure and conductivity of samples were obtained using atomic force microscopy. For the first time, the stability and degradation of the surface of superprotonic crystals were studied at the nanoscale. Based on piezoelectric response microscopy data, it was found that when the temperature decreased from 296 to 282 K, the (K0.43(NH4)0.57)3H(SO4)2 crystal transits from the paraelectric phase to the ferroelectric one.
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