Superionics: crystal structures and conduction …
INSTITUTE OFPHYSICSPUBLISHINGREPORTS ONPROGRESS INPHYSICSRep. Prog. (2004) 1233 1314PII: S0034-4885(04)93704-9Superionics: crystal structures and conductionprocessesStephen HullThe ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UKReceived 16 February 2004Published 14 June 2004Online conductors are compounds that exhibit exceptionally high values of ionicconductivity within the solid state. Indeed, their conductivities often reach values of theorder of 1 1cm 1, which are comparable to those observed in the molten state. FollowingFaraday s first observation of high ionic conductivity within the solids -PbF2and Ag2Sin1836, a fundamental understanding of the nature of the superionic state has provided oneof the major challenges in the field of condensed matter science.
Crystal structures and conduction processes 1237 Figure 1. The variation of the ionic conductivities of NaCl, β-PbF2 and AgI with temperature. The vertical arrows denote the melting points of each compound (schematic compilation using data
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