The structures of two high pressure modifications of NaOH have been determined by in situ x-ray measurements with a diamond anvil cell. Thermodynamic data for the transformation are derived from the P,T diagram. The structures are discussed and especially the influence of the H atoms on characteristic deformations. The compressibility of α-NaOH shows an anomaly, which can be explained by a continuous transformation to yet another new modification, which is isotypic with the low-temperature form of NaOD.
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Beck et al. (1993) studied this question.
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