Heat capacity and thermodynamic functions of zirconia and yttria-stabilized zirconia

High-temperature calorimetry of zirconia: Heat capacity and thermodynamics of the monoclinic–tetragonal phase transition

“…Concerning the m-phase, the set of smoothing equations for the combined data of D T 298.15 H m consistently describes both measured C p,m and D T 298.15 H m best, and moreover, is in excellent agreement with the low-T C p,m data by Tojo et al [8] as seen in the inset of figure 5(a). Thus, this set is adopted to represent C p,m and D T 298.15 H m .…”

“…This smoothing method requires a C p,m value at the standard temperature, i.e., 298.15 K, so that the derived C p,m equation gives this value at T = 298.15 K. (Note that 298.16 K was taken as the standard temperature in old papers.) Here, the most recent value of C p,m (298.15 K) = 56.14 J AE K À1 AE mol À1 reported by Tojo et al [8] was used for smoothing. The smoothing equation has the form D T…”

“…In fact, C p,m of some martensitic alloys with controlled thermal treatment measured by the adiabatic method shows a broad and symmetrical anomaly in the transformation region , calculated from the temperature-derivative of the smoothing equations for the combined data of the molar enthalpy change between T = 0 K and T, D T 0 H m , measured by the present transposed temperature drop calorimetry (t.t.d.c.) and the previous drop calorimetry (d.c.) [14] (table 3); -d-, measured by adiabatic method [8]; -AEAE-, Dulong-Petit limiting value of 9R. (b) D T 0 H m : s, measured by the present t.t.d.c.…”

“…There are reliable data on the low-T heat capacity of the m-phase [8][9][10], while only a few data points are reported for the heat capacity between T = (400 and 2800) K [11][12][13] in addition to the heat capacity equations reported by Coughlin and King [14], which were derived from the heat content measured by drop calorimetry (d.c.). Only the data given by Coughlin et al [14] have been accepted as literature values for high-T thermodynamic data of ZrO 2 [15,16].…”

Synthesis, Characterization and Thermal Diffusivity of Holmium and Praseodymium Zirconates

“…Specific heat was calculated using literature data for constituent oxides [15,16], based on Neumann-Kopp law. It was reported [17][18][19] that such calculations are in good agreement with measured values of heat capacity in RE zirconates.…”