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Infrared-Absorption Spectrum and Ferroelectric Behavior of Sodium Trihydroselenite

The infrared-absorption spectra of sodium trihydroselenite have been investigated in both the ferroelectric as well as the nonferroelectric phases. The analysis of the data suggests that in the ferroelectric phase the units HSeO3− and H2SeO3 are distinct with hydrogen bonds connecting their oxygens....

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Bibliographic Details
Published in:The Journal of chemical physics 1965-11, Vol.43 (9), p.2974-2979
Main Authors: Khanna, R. K., Decius, J. C., Lippincott, E. R.
Format: Article
Language:English
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Summary:The infrared-absorption spectra of sodium trihydroselenite have been investigated in both the ferroelectric as well as the nonferroelectric phases. The analysis of the data suggests that in the ferroelectric phase the units HSeO3− and H2SeO3 are distinct with hydrogen bonds connecting their oxygens. The transition to the nonferroelectric phase results in the two units becoming equivalent, each behaving like a pyramidal SeO3= ion. This is explained in terms of the motion of the protons in a potential field which, in the ferroelectric phase, has an asymmetric double minimum. The transition to the nonferroelectric phase is accompanied by an even distribution of proton density along the bond length which, on the basis of our data, seems to be due to the potential field acquiring a single minimum. Based on these results an attempt has been made to suggest a plausible switching mechanism in the ferroelectric phase and to correlate the spectral changes accompanying transition with the changes in the crystal structure.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1697260