Vaporization Study of YbCl₃, YbBr₃, YbI₂, LuCl₃, LuBr₃, and LuI₃ and a New Assessment of Sublimation Enthalpies of Rare Earth Trichlorides

Abstract

The vapor pressures of YbCl 3 , YbBr 3 , YbI 2 , LuCl 3 , LuBr 3 , and LuI 3 were measured by torsion and Knudsen effusion methods. Their temperature dependences may be reported as follows: YbCl 3 (s): log(p/kPa) ) (11.30 ( 0.20) -(14420 ( 200)/(T/K) from (944 to 1096) K; YbBr 3 (s): log(p/kPa) ) (11.51 ( 0.20) -(14070 ( 300)/(T/K) from (891 to 1032) K; YbI 2 (s): log(p/kPa) ) (9.37 ( 0.30) -(13580 ( 300)/(T/K) from (968 to 1049) K; YbI 2 (l): log(p/kPa) ) (9.04 ( 0.25) -(13220 ( 300)/(T/K) from (1068 to 1192) K; LuCl 3 (s): log(p/kPa) ) (11.68 ( 0.15) -(14940 ( 150)/(T/K) from (942 to 1075) K; LuBr 3 (s): log(p/kPa) ) (11.34 ( 0.20) -(14040 ( 300)/(T/K) from (903 to 1038) K; LuI 3 (s): log(p/kPa) ) (11.99 ( 0.40) -(14270 ( 300)/(T/K) from (862 to 1004) K. Treating the vapor pressures of YbCl 3 and LuCl 3 by secondand third-law, the following standard sublimation enthalpies, ∆ sub H°(298 K) ) (288 ( 6) and ( 295( 5) kJ‚mol -1 , respectively, were derived. Comparison of these enthalpies with those of other rare earth trichlorides, recalculated by using a new set of thermodynamic functions, was made. From the YbBr 3 , LuBr 3 , and LuI 3 vapor pressures, the second-law sublimation enthalpies, extrapolated at 298 K by estimated enthalpic increments, ∆ sub H°(298 K) ) (285 ( 9), (285 ( 9), and (288 ( 9) kJ‚mol -1 , respectively, were evaluated. For YbI 2 , ∆ sub H°(298 K) ) (302 ( 6) kJ‚mol -1 was obtained by use of thermal functions estimated by analogy with the published data on EuI 2 .

Single-Source Vapor Deposition of Quantum-Cutting Yb3+:CsPb(Cl1–xBrx)3and Other Complex Metal-Halide Perovskites

“…Energydispersive X-ray spectroscopy shows that the thin films contain almost the same concentration of Yb 3+ (4.7% of total B-site cations) as the single-source precursor (5.0%). Despite differences in the melting points of PbCl 2 , CsCl, and YbCl 3 (501, 645, and 704 °C, respectively 45,46 ), which imply a lower vapor pressure of Yb 3+ relative to the other constituents, these results demonstrate that SSVD can faithfully transform powders with complex compositions into films with almost the same compositions. Notably, these films contain no undesired phases, underscoring the high fidelity of the SSVD process.…”

Is There a Stable Deacon Catalyst? Computational Screening Approach for the Stability of Oxide Catalysts under Harsh Conditions

“…As usual with large data collections, missing and erroneous data are often an issue. Missing data, such as the sublimation enthalpies and entropies of rare earth chlorides and much more, were supplemented from primary literature. − The full data set with references is given in the Supporting Information.…”

Knudsen effusion mass spectrometric determination of the complex vapor composition of samarium, europium, and ytterbium bromides

“…Unfortunately, reactions (1) and (2) were not taken into account in earlier investigations [6,7] on the vaporization of Sm and Yb bromides by torsion effusion. The authors assumed that the vapor consisted mainly of LnBr 3 molecules in the case of tribromides and LnBr 2 molecules in the case of dibromides.…”