ChemInform Abstract: Crystalline Holmium Dichloride.

Abstract

The solid phase reaction between HoCl3 and Ho, which is conducted at 780 K under a vacuum, affords the title compound, whose structure is elucidated by XRD.

Lanthanide(III) halides: Thermodynamic properties and their correlation with crystal structure

“…Our molar enthalpy results for this transition, trs H m , as well as temperature and enthalpy of fusion, fus H m , agree well with Dworkin and Bredig data [15]. The enthalpy data given by Goryushkin et al [29] are significantly higher, but they were obtained by a DTA comparative method.…”

On Polymorphism of Dysprosium Trichloride

“…It was shown [13] that solid dysprosium trichloride forms the PuBr 3 type structure only at elevated temperatures and pressures (e.g., 520 °C and 40,000 atm), whereas at normal pressure and the same temperature, DyCl 3 has a thermodynamically stable monoclinic structure of the AlCl 3 type. The absence of any phase transitions in solid DyCl 3 was recognised from the results of many DTA and XAFS studies [14][15][16][17][18]. The authors of the much used Handbook on the properties of rare earth halides [19] are forced to note the essential disagreements between the results of different researchers; therefore, to date, the reasons for the conflicting data on the existence or absence of DyCl 3 polymorphism are not established.…”

“…It is of interest that the terbium trichloride dividing these two salt groups has an orthorhombic crystalline lattice (PuBr 3 type, D 2h 17 , Z = 4, CN = 8) which is extrinsic to other lanthanide trichlorides. It is found that TbCl 3 is thermally unstable and undergoes the phase transition at 510 °C [3] from orthorhombic structure to tetragonal one (D 4h 14 , Z = 2, CN = 6).…”

Thermodynamic properties of thulium and ytterbium in fused NaCl–KCl–CsCl eutectic

“…In this case one of the problems is the determination of the lanthanides ions oxidation state in molten electrolytes. It is well-known [6,[32][33][34][35][36][37][38] that the stable valent states of thulium and ytterbium are di-and trivalent ions. That's why we can expect that the redox reactions in studied systems will be single-electron reaction.…”