科研之友
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摘要
A calculation formula for determining he specific heat capacity of solid compound with an improved RD496-III microcalorimeter was derived. The calorimetric constant and precision determined by the Joule effect were (63.901 +/- 0.030) mu W/mW and 0.3% at 298.15 K, respectively, and the total disequilibrium heat has been measured by the Peltier effect. The specific heat capacities of two standard substances (benchmark benzoic acid and alpha-Al2O3) were obtained with this microcalorimeter, and the differences between their calculated values and literature values were less than 0.4%. Similarly, the specific heat capacities of thirteen solid complexes, RE(Et(2)dtc)(3)(phen) (RE=La, Pr, Nd, Sm-Lu, Et(2)dtc: diethyldithiocarbamate ion, phen: 1,10-phenanthroline) were gained, and their total deviations were within 1.0%. These values were plotted against the atomic numbers of rare-earth, which presents tripartite effect, suggesting a certain amount of covalent character in the bond of RE3+ and ligands, according to Nephelauxetic effect of 4f electrons of rare earth ions.
