High-temperature heat capacity and thermodynamic properties of TbSnO.

TbSnO has been prepared by solid-state reaction in air at 1473 K over a period of 200 h and its isobaric heat capacity has been studied experimentally in the range 350-1073 K. The C ( T) data for this compound have no extrema and are well represented by the classic Maier-Kelley equation. The experimental C ( T) data have been used to evaluate the thermodynamic properties of terbium stannate (pyrochlore structure): enthalpy increment H°( T)- H°(350 K), entropy change S°( T)- S°(350 K), and reduced Gibbs energy Ф°( Т). [ABSTRACT FROM AUTHOR]