Details

Autor(en) / Beteiligte

• Leitner, J
• Sedmidubský, D
• Růžička, K
• Svoboda, P

Titel

Heat capacity, enthalpy and entropy of SrBi₂O₄ and Sr₂Bi₂O

Ist Teil von

• Thermochimica acta, 2012, Vol.531, p.60-65

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2012

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Heat capacity and enthalpy increments of ternary strontium bismuth(III) oxides SrBi₂O₄ and Sr₂Bi₂O₅ were measured by the relaxation time method (2–210K), DSC (253–352K) and drop calorimetry (570–1072K). Temperature dependencies of the molar heat capacity in the form Cₚₘ=161.97+45.936×10⁻³T – 1.7862×10⁶/T²JK⁻¹mol⁻¹ and Cₚₘ=197.48+87.463×10⁻³T – 1.9282×10⁶/T²JK⁻¹mol⁻¹ for SrBi₂O₄ and Sr₂Bi₂O₅, respectively, were derived by the least-squares method from the experimental data. The molar entropies at 298.15K, S°ₘ(298.15K)=206.1±1.1JK⁻¹mol⁻¹ for SrBi₂O₄ and S°ₘ(298.15K)=261.2±1.4JK⁻¹mol⁻¹ for Sr₂Bi₂O₅, were evaluated from the low temperature heat capacity measurements.