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The knowledge derived from thermal measurements are important for non-crystalline materials because the structural disorder severely limits the precision of the information from diffraction and scattering experiments. To show the difference between the crystalline and amorphous substances, the heat capacities of glassy and crystalline potassium meta-phosphate are presented. A large excess heat capacity was found for the glassy sample at temperatures between 10 to 40 K with a maximum value at 25doi:10.1351/pac199870030599 fatcat:5pv7uk7lqjgjljralnmp6c4poa