Low-temperature heat capacities of terbium molybdate phosphates M2Tb(MoO4)(PO4) (MI = Na or K)статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The heat capacities of Na2Tb(MoO4)(PO4) and K2Tb(MoO4)(PO4) were measured by adiabatic calorimetry at low temperatures (6.34-333.74 and 7.20-341.17 K, respectively). Smoothed thermal-capacities values were used to calculate the entropy, enthalpy increments, and reduced Gibbs energy. The respective values at 298.15 K are as follows: for Na2Tb(MoO4)(PO4), C-p(0) (298.15 K) = 240.1 +/- 0.2 J/(K mol), (0)(298.15 K) = 307.4 +/- 0.4 J/(K mol), H-0(298.15 K) - H-0(0) = 4.95 +/- 0.03 kJ/mol, and Phi(0)(298.15 K) = 156.6 +/- 0.5 J/(K mol); and for K2Tb(MoO4)(PO4): C-p(0) (298.15 K) = 245.1 +/- 0.1 J/(K mol), S-0(298.15 K) = 322.9 +/- 0.1 J/(K mol), H-0(298.15 K) -H-0(0) = 46.58 +/- 0.02 kJ/mol, and Phi(0)(298.15 K) = 166.6 +/- 0.2 J/(K mol). The noncooperative magnetic component of the heat capacity was estimated.