Abstract
The ferroelectric crystal of ammonium iodate NH4IO3 was investigated by the methods of Raman and IR spectroscopy. Powder IR and Raman temperature dependent spectra of the title crystal were measured in the temperature range 300–400K near the Curie temperature (Tc=367K). The 127I nuclear quadruple resonance (NQR) spectra of the NH4IO3 crystal, which were measured in the same temperature range, are discussed. The effect of hindered rotation of NH4+ and IO3− ions was revealed in the pretransition temperature range and is explained by anomalous crystal thermal expansion.
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