Low-Temperature Heat Capacity of Lanthanum Hafnate

Thermodynamic Functions of Terbium Hafnate

“…Here, as in Anand et al [12], the curve of the molar heat capacity has a minimum (~2 J mol -1 K -1 ) at ~8 K. A further decrease in temperature leads to an increase in the molar heat capacity due to the increasing branch of a magnetic transformation, which occurs at a temperature <2 K. This phenomenon is particularly noticeable in comparison with the molar heat capacity of lanthanum hafnate (Fig. 3, curve 4) [19], which has the same structure Fd3m. The magnetic transformation in the range 0-2 K is characteristic of all the compounds of lanthanides, except lanthanum and lutecium [20].…”

Thermal properties of matter within the model of a two-phase system

“…where the coefficient is b(q) = (t x /T )∂ϕ/∂t. The calculations of the volume fraction of the new phase in metal glass Fe 40 Co 40 P 14 B 6 using the formula (8) with account of equalities (10) and (12) are shown in Fig. 1, a and 1, b respectively [24].…”

“…Table 1 gives the model parameters for complex oxides discussed in [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. As an example, Fig.…”

“…Experimenters are currently showing a constant interest in studying the heat capacities of complex oxides [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. It is due not only to their technical use (e.g., ceramics [15]), but also the uniqueness and diversity of physical properties.…”

Experimental determination of the enthalpy of formation of the pyrochlore rare‐earth hafnates

“…6 Yet the thermodynamic properties of light rare-earth pyrochlore hafnates, important for the reliable phase diagram determination, are insufficiently studied. Some extensive works have been carried out regarding the lowtemperature heat capacity measurements, for example, up to 300 K. The low-temperature heat capacity of La 2 Hf 2 O 7 compound with pyrochlore structure was investigated by Kopan et al 7 (57-302 K) and Guskov et al 8 (15-346 K) by adiabatic calorimetry and Anand et al 9 using PPMS (1.8-300 K). The heat capacity of Pr 2 Hf 2 O 7 was investigated in the temperature range 0-25 K by Craig 10 (although the experimental method is not described in the thesis), Yaraskavitch, 11 Sibille et al, 12 Anand et al 13,14 (1.8300 K), and Guskov et al 15 in the larger temperature ranges.…”