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1 Polish Journal of Chemistry

1 1998

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Vibratial and DSC investigations of the (NH4)4H2(SeO4)3 crystal

Baran J., Marchewka M.K., Drozd M., Czapla Z.

Polish Journal of Chemistry

1998

Vol. 72, nr 2

355-367

Polarized Raman and powder IR spectra for a (NH4)4H3(SeO4)3 crystal were measured at room temperature and discussed with relation to the crystal structure. Additionally, the reflection polarized IR spectra were measured. The transition into a metastable phase was observed for the first heating DSC scan. In following cooling and heating scans 5 and 7 phase transitions, respectively, were observed. No changes were noticed between the IR spectra of the fresh sample and that which was heated up to a superionic phase and cooled down. A strong reaction between the KBr windows and the sample occurs when heating to the superionic phase.