論文
使用済核燃料ガラス固化体中生成相Nd2（MoO4）3の熱力学的性質
キーワード:
heat capacity,
nuclear fuel waste glass,
fission product,
yellow phase,
geo-chemical simulation
2017 年 81 巻 10 号 p. 485-493
詳細
2017 年 81 巻 10 号 p. 485-493
The thermodynamic properties for Nd2(MoO4)3 were investigated. Nd2(MoO4)3 is one of the end member of the yellow phases which are known as hygroscopic harmful phases in the nuclear fuel waste glasses. The standard molar entropy, 
, at 298.15 K of Nd2(MoO4)3 was determined by measuring its isobaric heat capacities, 
, from 2 K via the fitting functions including the Debye-Einstein formula and electronic- as well as magnetic terms. The Neel temperature, TN, estimated by extrapolating the magnetic- term in the fitting function. Its standard Gibbs energy of formation, 
, was determined by combining datum with the standard enthalpy of formation, 
, which were estimated from ones for Ce2(MoO4)3 and Sm2(MoO4)3. The unknown standard Gibbs energies of solution, 
, at 298.15 K for Nd2(MoO4)3 were predicted from the reference data for MoO42-(aq) and Nd3+(aq). The obtained thermodynamic values are as follows:
