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- W2007074529 abstract "The emf of the galvanic cells with Pt, Cs2CrO4 (α or β)|Cr2O3|Cs3CrO4 (cell I) and Pt, s2CrO4(β)|Cr2O 3|Cs2Cr2O7(l) (cell II) against air|Pt reference electrode using 15 mol% calcia stabilized zirconia as the electrolyte were measured to be EI(a)(mV) = (1345.88 ± 3.68) − (0.53174 ± 0.03376)T(K); (860–967 K) EI(b) (mV) = (1266.47 ± 1.50) − (0.45345 ± 0.04351)T(K); (1052–1097 K) EII (mV) = (344.42 ± 1.84) − (0.25715 ± 0.0079)T(K); (1025–1189 K). Using the literature data for the standard Gibbs energies of formation of α-Cs2CrO4 and Cr2O3 together with the above numerical expressions for the emf values of cell I, the transition temperature and the standard enthalpy of α-to-β phase transformation in Cs2CrO4 were found to be 1014 K and 12.8 kJ mol−1. In addition, the ΔGf0 (Cs3CrO4) was derived to be as follows: (ΔGf0 (Cs3CrO4) ± 2.0) (kJ mol−1 = −1531.72 + 0.38044 T(K). The emf results from cell II led to the expression (ΔGf0 (Cs2Cr2O7,1 ± 3.35) (kJ mol−1) = − 2066.47 + 0.55062 T(K). By making emf measurements on galvanic cells with Pt, M2CrO4 (β)|Cr2O3|M2Cr2O7 (l) (where M = Na or K) against air|Pt as the reference electro configuration identical with cell II, the following expressions for ΔGf0 of M2Cr2O7(l) were derived. (ΔGf0(Na2Cr2O7,1 ± 2.0) (kJ mol−1) = −1942.68 + 0.51289 T(K), (ΔGf0(K2Cr2O7,1 ± 2.5) (kJ mol−1) = −2037.35 + 0.5406 T(K). The third law treatment of the emf data on cells I and II yielded the values of −1549.8 ± 1.4 kJ mol−1 and −2108 ± 4 kJ mol−1 r for the standard enthalpies of formation, ΔHf2980 of Cs3CrO4(s) and Cs2Cr2O7(s)." @default.
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- W2007074529 date "1997-11-01" @default.
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- W2007074529 title "Thermodynamic stabilities of Cs2CrO4(β), Cs3CrO4 and M2Cr2O7(l) (where M = Na, K or Cs) by solid electrolyte emf method" @default.
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- W2007074529 doi "https://doi.org/10.1016/s0022-3115(97)00233-x" @default.
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