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Analyses of vibrational spectra and X‐ray powder diffraction data demonstrate that two phases (space groups I2/m and P21/n) coexist for calcium oxalate monohydrate between 273 and 376 K. Interpretation of the Raman spectra indicates that the I2/m‐P21/n phase transition near 320 K is analogous to the cubic‐tetragonal phase transition of NH4Cl. Unambiguous Rarnan band assignments are reported for the phase with space group I2/m. Several band reassignments are made for calcium oxalate monohydrate with space group P21/n.
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Duval et al. (1985) studied this question.
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