Disorder study in triammonium hydrogen disulphate (NH4)3H (SO4)2 and its solid solutions (NH4)3− x M x H(SO4)2

Infrared and Raman spectra of (NH 4 ) 3-x K x H(SO 4 ) 2 , 0 ≤x ≤ 3 (NKHS) alloys have been investigated at room temperature. An assignment of different bands in terms of the OH group, SO 2- 4 and NH + 4 ions is given. The substitution effects have been studied in terms of evolution towards order using OH group frequencies, the splittings of the ν 1 and ν 4 (SO 2- 4 ) Raman bands and the ν 1 (S-OH) Raman band width and frequency. The size effect of the alkaline substitute has been studied through comparison between potassium and rubidium salts for the phase x = 1.

[1]  T. Mhiri,et al.  Étude des transitions de phase cristalline dans le diammonium potassium hydrogène disulfate (NH4)2 KH (SO 4 )2 , 1991 .

[2]  N. Fourati,et al.  Vibrational study of trirubidium hydrogen disulfate Rb3H(SO4)2 , 1989 .

[3]  A. Lautié,et al.  Etude par Spectrométrie Infrarouge et Raman des Phases Cristallines Basses Temperatures de (NH4)3H(SO4)2 , 1988 .

[4]  R. Blinc,et al.  Vibrational spectra of and phase transitions in caesium hydrogen sulphate , 1987 .

[5]  A. Daoud,et al.  Linear birefringence and phase transitions in triammonium hydrogen disuiphate, (NH4)3H(SO4)2 , 1987 .

[6]  F. Romain,et al.  Vibrational study of hydrogen bonding and structural disorder in Na2H(SO4)2, K3H(SO4)2 and (NH4)3H(SO4)2 crystals , 1985 .

[7]  S. Fortier,et al.  Structure of trirubidium hydrogenbis(sulfate), Rb3H(SO4)2 , 1985 .

[8]  J. Monier,et al.  Structure du disulfate acide de triammonium. Une redétermination. Relations des chaînes de liaisons hydrogène avec la morphologie et la conductivité électrique , 1985 .

[9]  D. Whiffen.  Spectroscopic constants evaluated by numerical contact transformation , 1985 .

[10]  K. Gesi,et al.  Calorimetric Study on Phase Transitions in (NH4)3H(SO4)2 , 1979 .

[11]  A. Novák.  Vibrational Spectroscopy of Hydrogen Bonded Systems , 1979 .

[12]  S. Suzuki,et al.  The crystal structure of triammonium hydrogen disulphate, (NH4)3H(SO4)2 , 1978 .

[13]  J. Evans.  Narrow transmission regions within broad infrared absorption bands in solids , 1962 .