A sol–gel method was used to synthesize barium,
lanthanum,
and tungsten-based samples doped with praseodymium Ba(La1–x
Pr
x
)2WO7, where x = 0.005 ÷ 0.05. The morphological
and elemental analyses of the samples were carried out by electron
probe microanalysis. A full-profile refinement of the crystal structure
of the compounds belonging to the monoclinic system with the space
group P1121/b was carried
out. Using the adiabatic calorimetry method, the heat capacity of
the samples was measured and the thermodynamic functions in the range
of 5–320 K were found. In the heat capacity of the samples
below 15 K, anomalies were detected and the excessive and lattice
heat capacities were determined.