Thermodynamic properties of lanthanum silicides at high temperatures

Thermodynamic properties of erbium mono-and disilicide at low temperatures

“…Comparing the heat capacities of lanthanum and gadolinium mono-and disilicides [7,11], we see that they remain the same for the isostructural compounds within the error of measurement over the entire low-temperature range. Assuming that regular elements of the heat capacity are equal (the sum of electron and phonon contributions) for the isostructural lanthanum, gadolinium, and erbium silicides, the associated Schottky contribution can be assessed as the difference between the isobaric heat capacity of erbium silicide and isostructural lanthanum or gadolinium silicide.…”

“…The heat capacity of silicides was measured adiabatically involving periodic heat supply at a low-temperature standard apparatus (UNTO) [7]. Experimental values of heat equivalent of an empty calorimeter A(T) are described by the following relations (J ⋅ K −1 ) with an error of 0.20% over the ranges of 50-90, 90-200, and 200-300 K:…”

Thermodynamic properties of LuGe1.5 at 55 to 1790 K

“…The heat capacity of germanide was adiabatically measured using a sample of 20.8071 g and a standard lowtemperature thermal installation [7]. The qualification of the installation by measuring the heat capacity of a standard thermodynamic sample (α-Al 2 O 3 ) has shown that the error of determining the heat capacity of solids does not exceed 0.4% over a range from 50 to 300 K. Enthalpy over a range from 400 to 1200 K was measured by mixing using a hightemperature differential calorimeter [8] and samples of 0.2 to 0.3 g and at T > 1200 K using a high-temperature calorimeter [9] with computer-aided measurement of temperature [10] and a sample of 4.9722 g placed into a double tantalum capsule.…”

The thermal capacity and enthalpy of gadolinium sesquiselenide over a wide temperature range

“…The thermal capacity was measured by an adiabatic method with periodic heat input at low-temperature standard thermophysical equipment (UNTO) [6], which had an upgraded calorimeter of volume 10 cm 3 [7]. The equipment had been certified in accordance with the [8] recommendations on electrolytic copper remelted and annealed under vacuum and on α-Al 2 O 3 made in the Sverdlovsk branch of the Mendeleev All-Union Metrology Research Institute.…”