Abstract
Measurements of the enthalpies of reactions occurring in the liquid state were used to determine the standard enthalpies of formation ΔH 0298 of the monosulfides LnS (Ln = La, Ce, Pr, Nd, and Gd) with the NaCl-type structure and sesquisulfides Ln2S3 (Ln = La, Ce, Pr, and Nd) with the Th3P4-type structure. The values of ΔH 0298 of LaS La2S3, Ce2S3, and Nd2S3 were compared with the published values. The values of ΔH 0298 of LaS, PrS, NdS, GdS, and Pr2S3 were obtained for the first time. The ionic component of the chemical bonds in the mono- and sesquisulfides decreased with increasing atomic number of the rare-earth element. This was in agreement with the observation that the difference between the electronegativities of the rare-earth elements and sulfur decreased along the lanthanide series.
“Crystals,” pp. 282–291 (see page 3).
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Semenkovich, S.A., Sergeeva, V.M., Finogenov, A.D. (1972). Enthalpies of Formation of Some Rare-Earth Sulfides. In: Sirota, N.N. (eds) Chemical Bonds in Solids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1686-2_28
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