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用真空绝热量热计测定了库水硼镁石2MgO·3B_2O_3·15H_2O 在65—310K 间的比热.比热和温度的关系如下式所示:c_p(J/K·mol)=-69.6577+3.6266T-1.7008×10~(-3)T~2-7.522×10~(-6)T~3+1.5×10~(-8)T~4(65—310K 范围).据据 Debye—Einsein 函数组合式,c_p(J/K·mol)=4.184[D(65/T)+2E(113/T)+4E(200/T)+10E(319/T)+18E(805/T)+9E(900/T)+20E(1450/T)],计算了0—65K 间的比热,其误差为0.4%。在65—310K 范围内,每隔5K,计算了熵、焓和自由能函数.其数据列于表3.在298.15K 时,S=723.4±4.8J/K·mol,H=118.2±0.2kJ/K·mol,G=327±5.4J/K·mol.
The specific heat of 2MgO · 3B_2O_3 · 15H_2O between 65 and 310 K was determined by vacuum adiabatic calorimeter.The relation between specific heat and temperature is as follows: c_p (J / K · mol) = -69.6577 + 3.6266T-1.7008 × 10 -3 T ~ 2-7.522 × 10 -6 T -3 + 1.5 × 10 -8 T 4 (65-310K range) According to Debye-Einsein Function Combination, c_p (J / K · mol) = 4.184 [D (65 / T) + 2E (113 / T) + 4E (200 / T) + 10E (319 / T) + 18E (805 / T) + 9E (900 / T) + 20E (1450 / T)], the specific heat between 0-65K was calculated and the error was 0.4%. The entropy, enthalpy and free energy function were calculated every 5K in the 65-310K range and the data are presented in Table 3. At 298.15K, S = 723.4 ± 4.8J / K · mol, H = 118.2 ± 0.2kJ / K · mol, G = 327 ± 5.4 J / K · mol.