.in effect of particle sizc upon the heat capacity of socliu~n cl~loricle has been found in the te~mperature range 9' to 21°1C. The euperiments were clone with three NaCl samples of specific surfaces between 38 and 59 sq. meters per gm. 'The observed effect has the temperature dependence predicted by theory but its 111agnitude is three to four times larger than expected. I t is unlil (2N/a) (yo is the maximum frequency of the solid lattice and N3 is the number of atoms in the particle). 'ibfanz~script received Seplenzber 16, 1964.
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