Thermodynamic properties of HgBa2CuO4+

Alyoshin, V. A.; Mikhailova, Daria; Антипов, Е.В.; Monayenkova, A.S.; Popova, A. A.; Tiphlova, L.A.; Karpiński, J.

doi:10.1016/s0925-8388(98)00882-2

Cited by 8 publications

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“…We have measured previously 16 the thermodynamic properties of the GdBa 2 Cu 3 O 6.92 phase as follows: 0.5Gd 2 O 3 (s) + 2BaO (s) + 3CuO (s) + 0.2O 2 (g) ) GdBa 2 Cu 3 O 6.9 (s) (15) ∆ ox H o (323.15K) ) -174.1 ( 12.6kJ/mol Data for the enthalpies of reactions 12 and 15 and our data on the enthalpy of reaction of BaO + CuO ) BaCuO 2 16 were used to calculate the enthalpies of reactions:…”

Section: Resultsmentioning

confidence: 99%

“…However, there are some uncertainties regarding their thermochemistry. Thermochemical properties were investigated mainly for Y 2 O 3 −BaO−Cu−O, – and to a lesser extent for other RE 2 O 3 −BaO−Cu−O systems. , We determined the enthalpy of formation of GdBa 2 Cu 3 O x previously . There are no thermochemical data for Gd 2 BaCuO 5 and the superconductor LuBa 2 Cu 3 O x .…”

Section: Introductionmentioning

confidence: 99%

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Thermochemistry of Gd₂BaCuO₅ and LuBa₂Cu₃O_x

2008

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Solution calorimetry, using 6.0 M HCl as a solvent, is used to study the thermochemistry of Gd2BaCuO5 and the high-temperature superconductor LuBa2Cu3O6.92. For the first time, the standard formation enthalpies of these phases have been determined as follows: DeltafH(o)(Gd2BaCuO 5, s, 298.15 K) = -2618.6 +/- 7.4 kJ/mol; DeltafH(o)(LuBa2Cu3O6.92, s, 298.15 K) = -2693.1 +/- 11.9 kJ/mol. The thermodynamic stability at room temperature has been assessed. The results show that Gd211 and Lu123 are thermodynamically stable with respect to binary oxides and unstable with respect to interaction with CO 2 at ambient temperatures. Lu123 is thermodynamically stable with respect to assemblages containing combinations of Lu2O3, CuO, and BaCuO2 and thermodynamically unstable with respect to interactions with water.

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Section: Resultsmentioning

confidence: 99%