Thermogravimetry of the high temperature proton conductors BaCa0.3Nb0.6Nd0.1O3-delta, SrCa(1-x)/3Nb(2-x)/3O3-x/2 and Sr(Zr0.8Ce0.2)(0.8)In0.2O3-delta

The compounds BaCa0.3Nb0.6Nd0.1O3-delta, SrCa(1+x)/3Nb(2-x)/3O3-x/2 with x = 0.24 and Sr(Zr0.8Ce0.2)(0.8)In0.2O3-delta were analyzed by thermogravimet ry regarding their water uptake capacity. Solution enthalpies, entropies an d maximum proton contents were extracted from the data. The compounds were also characterized by XRD. As expected, all compounds absorb water vapor an d may be expected to show high-temperature proton conductivity. The first c ompound is derived from the complex perovskite BCN18 introduced by Nowick e t al., the second one is the complex perovskite designated SCN24 by the sam e authors and the third is a new compound with partial substitution of Zr b y Ce and trivalent doping. (C) 1999 Elsevier Science B.V. All rights reserv ed.