Infrared spectra of anhydrous and hydrated barium nitrite

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Abstract
The infrared spectra of crystalline barium nitrite monohydrate and of the deuterium substituted or anhydrous counterparts were investigated at various temperatures up to the melting piont of the anhydride 516 K (243 °C). Samples were prepared as mineral oil mulls, single crystal plates, and oriented polycrystalline sheets and were measured in polarized or unpolarized radiation. In addition to observations of the dehydration occurring near 430 K (167 °C) as temperature is increased and transitions among the three forms of anhydride (I, II, and III) known from x-ray and thermal measurements, a new transition near 348 K (75 °C) in the monohydrate was investigated, and a new, room temperature form of anhydride (IV) was discovered.

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