These compounds are known as fast ion conductors.

Above 420 K, Ag ions can move rapidly through the solid, making it a fast ion conductor.

Technological applications of fast ion conductors include batteries, sensors, ion pumps and fuel cells.

Examples of fast ion conductors include beta-alumina solid electrolyte, beta-lead fluoride, zirconium dioxide, silver iodide.

The Lehovec's effect had given a basis for a creation of multitude nanostructured fast ion conductors which used in modern portable lithium batteries and fuel cells.

Beta-alumina solid electrolyte (BASE) is a fast ion conductor material used as a membrane in several types of molten salt electrochemical cell.

To save money, the Bloom Energy Server uses inexpensive metal alloy plates for electric conductance between the two ceramic fast ion conductor plates.

AdSICs are fast ion conductors that have a crystal structure close to optimal for fast ion transport (FIT).

The topics of interest include fundamental properties of oxide ceramics at nanometer length scales, and fast ion conductor (advanced superionic conductor)/electronic conductor heterostructures.

A more modern definition of heterojunction is the interface between any two solid-state materials, including crystalline and amorphous structures of metallic, insulating, fast ion conductor and semiconducting materials.

Lithium aluminum germanium phosphate has been found to be an effective electrolyte, but the ionic conductivity of current lithium fast ion conductors are still lower than liquid electrolyte alternatives.

Fast ion conductors are intermediate in nature between crystalline solids which possess a regular structure with immobile ions, and liquid electrolytes which have no regular structure and fully mobile ions.

In solid-state ionics, fast ion conductors, also known as solid electrolytes and superionic conductors, are materials that act as solid state ion conductors and are used primarily in solid oxide fuel cells.

The electrical double layer (EDL) is a structure which describes the variation of electric potential near a surface, and has a significant influence on the behaviour of colloids and other surfaces in contact with solutions or solid-state fast ion conductors.

The examples of nanoionic devices are all-solid-state supercapacitors with fast ion transport at the functional heterojunctions (nanoionic supercapacitors), lithium batteries and fuel cells with nanostructured electrodes, nano-switches with quantized conductivity on the basis of fast ion conductors (see also programmable metallization cell).