Trends in stability of rare earth pyrochlores in the lanthanide series: Ruthenium. (2020)

• Record Type: Journal Article
• Authors: Banerjee, Aparna
• Is Part Of: Materials today. Volume 29:Part 3(2020)
• Page Start: 946
• Page End: 950
• Publication Date: 2020
• Subjects: Pyrochlores -- Tolerance factor -- Lanthanides -- Stability -- Gibbs energy of formation -- Enthalpy of formation; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2020.05.611
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Stability of lanthanide pyrochlores is important as they are proposed as rad-waste matrices. The molar Gibbs energy of formation data obtained was correlated with increase in atomic number down the lanthanide series for Ln2 Ru2 O7 where (Ln = Nd, Sm, Eu, Gd, Ho-Lu &Y). The enthalpies of formation of the ternary oxides from their component binary oxides at T/K = 298.15 were determined. The enthalpies of formation from oxides become less negative down the lanthanide series as the radius ratio Ln/Ru decreases. These thermodynamic data can be correlated to pyrochlores ability to withstand irradiation damage, an important input for the nuclear industry.