Phase behaviour of the solid proton conductor CsHSO4
Journal article, 2006

The sequence of previously found phase transitions in CsHSO4 at around 60, 122, and 141 °C was carefully examined by using thermo-gravimetric analysis (TGA), mass spectroscopy (MS), differential thermal analysis, ac calorimetry, impedance spectroscopy, and x-ray diffraction (XRD). Our results show evidence that at all these transition temperatures, the dehydration processes take place at or very near the surface of the crystal. As a consequence, our results support the phase of CsHSO4 above 141 °C being not a superprotonic-conducting phase but rather a mixture of CsHSO4 and Cs2S2O7 caused by a partial thermal decomposition that includes the break-up of hydrogen bonds and the formation of H2O molecules.

Author

E. Ortiz

Universidad Del Atĺntico

R. A. Vargas

Universidad del Valle

Bengt-Erik Mellander

Chalmers, Applied Physics, Solid State Physics

Journal of Physics Condensed Matter

0953-8984 (ISSN)

Vol. 18 42 9561-9573 003

Subject Categories

Other Engineering and Technologies

DOI

10.1088/0953-8984/18/42/003

More information

Created

10/6/2017