Sintered ceramic composite lead with superconductive nano-architecture

A sintered high temperature superconducting (HTS) ceramic electric lead formed as three-dimensional (3D) HTS macro-ceramic solid product with honeycomb-like superconductive nano-architecture, comprising substantially uniformly aligned nano-size HTS ceramic crystal grains, silicate glass nano-thick films, and nano-size silver and/or inorganic dots that locate in nano-thick boundary areas of said superconductor ceramic crystal grains, and said nano-size films or dots provide honeycomb-like 3D nano-size network within said 3D HTS macro-ceramic solid product or HTS ceramic lead, and said electric lead is superconducting at liquid nitrogen cooling temperature, wherein said HTS ceramic crystal grains are composed of YBa2Cu3O7-x ceramic crystals, and an average number of oxygen atoms in a stoichiometric formula of YBa2Cu3O7-x ceramic crystals, where “x” may be varied in a range 0<x<0.3, is so that it provides superconductivity of the HTS ceramic crystal grains and said sintered HTS ceramic lead or 3D HTS macro-ceramic product, wherein said HTS lead has the YBa2Cu3O7-x ceramic crystal grains having 10-25 nm in length.