Annotation of the articleA new class of superionic conductors (SIC) ‑ advanced superionic conductors (ASICs) with the activation energy of ionic conductivity E ≈ 0,1 eV ‑ is marked out. A new direction of nanoionics ‑ nanoionics of ASICs ‑ is proposed. Nanosystems of solid state ionic conductors are divided into two classes differing by opposite influence of surface layer disordering on ionic conductivity si and E:
1) nano-systems on the basis of compounds with an initially small si (large values of E);
In the work for nano-ASICs are introduced: (i) a characteristic parameter P = d/lQ (d ‑ the thickness of a layer of ASIC with disordered crystal structures in the area of a hetero-boundary, lQ ‑ the screening length for mobile ions in the bulk of ASIC, and (ii) a criterion of the conservation of FIT. It is shown that in nano-ASICs at the leveling of Fermi levels, the contact potentials Fat the ASIC/InEl coherent heterojunctions satisfy the condition V< |