Heat capacity of rare-earth stannates in the range 350–1000 K

Resumo

R₂Sn₂O₇ (R = Pr–Lu) rare-earth stannates with the pyrochlore structure have been synthesized by solid-state reactions, by firing stoichiometric mixtures of SnO₂ and R₂O₃ in air at 1473 K. The high-temperature heat capacity of the rare-earth stannates has been determined by differential scanning calorimetry in the temperature range 350 to 1000 K, and the Raman spectra of polycrystalline Tb₂Sn₂O₇ and Dy₂Sn₂O₇ samples have been measured.