Abstract
Surfaces of the natural cleavage of water-soluble single crystals (K0.43(NH4)0.57)3H(SO4)2 is studied via atomic force microscopy. It is shown that ultrafine details of nanorelief (pits and hills with stable parameters of height (depth) of ~0.7 nm form on the surfaces of crystals) correspond to 1/3 с in a unit cell. A phase transition (from paraelectric to ferroelectric) is detected in the (K0.43(NH4)0.57)3H(SO4)2 crystal via microscopy of the piezoelectric response as the temperature falls from 296 to 282 K.
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ACKNOWLEDGMENTS
We are grateful to V.V. Dolbinina (Institute of Crystallography, Russian Academy of Sciences) for providing our crystal samples, and to A.S. Kalinin (NT-MDT Spectrum Instruments) for his help in our work. Our experiments were conducted using equipment of the Shared Equipment Center of FSRC “Crystallography and Photonics” of the Russian Academy of Sciences (project RFMEFI62119X0035).
Funding
This work was supported by the RF Ministry of Science and Higher Education within the government research contract with the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences; and by Basic Research Program 1.2.P no. 32 of the Presidium of the Russian Academy of Sciences.
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Translated by I. Obrezanova
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Gainutdinov, R.V., Tolstikhina, A.L., Selezneva, E.V. et al. AFM Study of Potassium–Ammonium Hydrogen Sulfates at Lower Temperatures. Bull. Russ. Acad. Sci. Phys. 83, 1353–1356 (2019). https://doi.org/10.3103/S1062873819110108
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DOI: https://doi.org/10.3103/S1062873819110108