Abstract
The (NH4)3H(SeO4)2 crystals in the temperature range of 296–343 K and the evolution of their surface at phase transitions have been studied by atomic force microscopy. Data on morphology and local electrical characteristics of crystal surface are obtained. Local current–voltage characteristics are measured, and the existence of structural phase transition to the phase with superprotonic conductivity at T ≈ 308 K is confirmed. A layer of non-conducting phase of variable composition is shown to appear on the crystal surface at the phase transitions.
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Funding
The study was supported by the Ministry of Science and Higher Education of the Russian Federation within a State assignment for the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences (RAS) and, in part, by the Program of Basic Research of the Presidium of the RAS 1.2.P no. 32. The experiments were performed using the equipment of the Shared Research Center of the Federal Scientific Research Centre “Crystallography and Photonics” of the RAS, with support of the Ministry of Science and Higher Education (project no. RFMEFI62119X0035). The preparation and preliminary characterization of the samples were performed with support of the Russian Foundation for Basic Research (project no. 18-32-20050).
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Gainutdinov, R.V., Tolstikhina, A.L., Selezneva, E.V. et al. Surface Evolution at the Phase Transitions in (NH4)3H(SeO4)2 Crystals. Crystallogr. Rep. 66, 508–513 (2021). https://doi.org/10.1134/S1063774521030068
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DOI: https://doi.org/10.1134/S1063774521030068