Superprotonic conductivity in β-Cs3(HSO4)2(Hx(P,S)O4)

✍ Scribed by Sossina M Haile; Pamela M Calkins; Dane Boysen

• Book ID: 104296628
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 623 KB
• Volume: 97
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(97)00066-0

✦ Synopsis

Investigations of the system CsHSO -CsH PO led to discovery of the new compound, b-Cs (HSO ) (H (P,S)O ), with 4 2 4 3 4 2 x 4 a superprotonic phase transition at 1258C. The room temperature structure of b-Cs (HSO ) (H (P,S)O ) is related to that of 3 4 2 x 4 a -Cs (HSO ) (H PO ) and that of CsHSO -II. It is unique, however, in that P and S occupy the same crystallographic 3 4 2 2 4 4

position in the structure, and there is accordingly a variable H content and a partially occupied hydrogen bond. This leads to room temperature conductivity that is significantly higher than either of the two related compounds. The conductivity in the high temperature phase is comparable to that of CsHSO -I. Furthermore, the transition exhibits a relatively large heat of 30 4 21 J g and some hysteresis. These are explained by probable disordering between S and P sites upon transition to the superprotonic state.