An advanced superionic conductor (AdSIC) in
materials science, is
fast ion conductor that has a
crystal structure
In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions or molecules in a crystal, crystalline material. Ordered structures occur from the intrinsic nature of the constituent particles to form symmetric pat ...
close to optimal for fast ion transport (FIT).
History
The term was introduced in a paper by A.L. Despotuli, A.V. Andreeva and B. Rambaby.
Characteristics
The rigid ion sublattice of Advanced SuperIonic Conductors (AdSICs) has structure channels where mobile ions of opposite sign migrate. Their ion-transport characteristics display ionic conductivity of ~0.3/Ω cm (
RbAg4I5, 300 K) and activation energy of E
i~0.1 eV. This determines the temperature-dependent concentration of mobile ions ni~Ni x e
Ei/kBT capable to migrate in conduction channels at each moment (Ni~10
22/cm
3, ni~2x10
20/cm
3, 300 K).
The
Rubidium silver iodide Rubidium silver iodide is a ternary inorganic compound with the formula RbAg4I5. Its conductivity involves the movement of silver ions within the crystal lattice. It was discovered while searching for chemicals which had the ionic conductivity prop ...
–family is a group of AdSIC compounds and solid solutions that are isostructural with the RbAg
4I
5 alpha modification. Examples of such compounds with mobile Ag
+- and Cu
+-cations include KAg
4I
5, NH
4Ag
4I
5, K
1−xCs
xAg
4I
5, Rb
1−xCs
xAg
4I
5, CsAg
4Br
1−xI
2+x, CsAg
4ClBr
2I
2, CsAg
4Cl
3I
2, RbCu
4Cl
3I
2 and KCu
4I
5.
RbAg
4I
5 AdSIC displays peculiar features of crystal structure and dynamics of mobile ions.
Recently, all solid state micrometre-sized
supercapacitors
A supercapacitor (SC), also called an ultracapacitor, is a high-capacity capacitor, with a capacitance value much higher than other capacitors but with lower voltage limits. It bridges the gap between electrolytic capacitors and Rechargeable ba ...
based on AdSICs (
nanoionic supercapacitors
Nanoionics is the study and application of phenomena, properties, effects, methods and mechanisms of processes connected with fast ion transport (FIT) in all-solid-state nanoscale systems. The topics of interest include fundamental properties of ...
) had been recognized as critical electron component of future sub-voltage and
deep-sub-voltage nanoelectronics Deep-sub-voltage nanoelectronics are integrated circuits (ICs) operating near theoretical limits of energy consumption per unit of processing. These devices are intended to address the needs of applications such as wireless sensor networks which ha ...
and related technologies (22 nm technological node of CMOS and beyond). Researchers also developed an all-solid-state battery employing
RbAg4I5 superionic conductor.
References
External links
* {{Cite web, url=http://ruby.chemie.uni-freiburg.de/Vorlesung/Strukturtypen/sonstige_rbag4i5.html, title=Strukturtypen-Datenbank, website=ruby.chemie.uni-freiburg.de, access-date=2017-03-10
Electricity