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The phase transition between the two anhydrous modifications of NaHSO 4 (α and β) was studied using Raman spectroscopy and differential scanning calorimetry. These measurements indicate that β-NaHSO 4 is a metastable phase and readily undergoes phase transition to thermodynamically stable α-NaHSO 4 with an exothermic enthalpy change of 3.5kJ/mol. Both thermal (temperatures...
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