A free-energy model of ionic conductors that are ferroelectric in their low
-temperature phase is presented, together with data on systems that meet th
at description, including cesium dihydrogen phosphate, thallium antimony ox
y-germanate, the 'Nascion' sodium scandium phosphates, and silver iodide te
tratungstate. (C) 1999 Elsevier Science B.V. All rights reserved.