Structural and vibrational study of a new protonic conductor (CS)(0.26)(Rb)(0.74)H(SO4)(0.89)(SeO74)(0.11)

The crystal structure of (Cs)(0.26)(Rb)(0.74)H(SO4)(0.89)(SeO4)(0.11) (CsRb HSSe) has been determined by X-ray single-crystal analysis. This compound c rystallizes in the space group Pc with unit cell dimensions a = 14.733(4) A ngstrom, b = 4.6437(9) Angstrom, c = 15.102(4) Angstrom, beta = 120.94(3)de grees, and Z = 8. The refinement converged to R = 0.0391 and wR(2) = 0.0964 . The mixed compound CsRbHSSe is a chain-based structure. The Cs+ and Rb+ c ations are intercalated between chains of HBO4- (B = S, Se) groups linked w ith O-H . . .O hydrogen-bonding. CsRbHSSe presents a new type of structural arrangement different from RbH(SO4)(0.81)(SeO4)(0.19) (RbHSSe) and CsH(SO4 )(0.76)(SeO4)(0.24) (CsHSSe). Infrared (IR) and Raman spectroscopic studies were performed to confirm results of the radiocrystallographic method. (C) 2001 Elsevier Science Ltd. All rights reserved.