ABSTRACT

The equilibrium vapor pressures over GdCl3, GdBr3, alpha-GdI3, TbCl3, TbBr3, and alpha-TbI3 were measured by the torsion-effusion method. The obtained data are well represented in the covered temperature ranges by the following selected equations: GdCl3(l) log(p/kPa) = 9.50 +/- 0.30-(13 113+/- 300)(K/T) (from 930 to 1213 K) GdBr3(s) log(p/kPa) = 11.46 +/- 0.20 - (14 355 +/- 200)(K/T) (from 895 to 1057 K) GdBr3(l) log(p/kPa = 9.75 +/- 0.30 - (12 671 +/- 400)(K/T) (from 1060 to 1179 K) alpha-GdI3(s) log(p/kPa) = 10.99 +/- 0.20 - (13 651 +/- 200)(K/T) (from 890 to 1012 K) TbCl3(l) log(p/kPa) = 9.13 +/- 0.20 - (12 210 +/- 200)(K/T) (from 921 to 1117 K) TbBr3(s) log(p/kPa) = 11.09 +/- 0.20 - (14 013 +/- 200)(K/T) (from 904 to 1108 K) alpha-TbI3(s) log(p/kPa) = 11.33 +/- 0.30 - (13 850 +/- 400)(K/T) (from 861 to 1078 K) Considering the vapor consists only of the monomeric form, by the second- and third-law treatment of the experimental data, the following standard sublimation enthalpies of the compounds were derived: 311 +/- 4, 292 +/- 2, 279 +/- 2, 296 +/- 4, 288 +/- 4, and 279 +/- 2 kJ.mol-1 for GdCl3, GdBr3, alpha-GdI3, TbCl3, TbBr3, and alpha-TbI3, respectively.

Compounds

#	Formula	Name
1	Cl3Gd	gadolinium(III) chloride
2	Br3Gd	gadolinium bromide (GdBr3)
3	GdI3	gadolinium triiodide
4	Cl3Tb	terbium trichloride
5	Br3Tb	terbium tribromide
6	I3Tb	terbium triiodide

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Derived by Second law	1
POMD	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER:dPV:30%	58
POMD	2	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Derived by Second law	1
POMD	2	Molar enthalpy of vaporization or sublimation, kJ/mol ; Crystal	Temperature, K; Crystal	Crystal Gas	Derived by Second law	1
POMD	2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER:dPV:30%	32
POMD	2	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	OTHER:dPV:30%	102
POMD	3	Molar enthalpy of vaporization or sublimation, kJ/mol ; Crystal	Temperature, K; Crystal	Crystal Gas	Derived by Second law	1
POMD	3	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	OTHER:dPV:30%	105
POMD	4	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Derived by Second law	1
POMD	4	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER:dPV:35%	81
POMD	5	Molar enthalpy of vaporization or sublimation, kJ/mol ; Crystal	Temperature, K; Crystal	Crystal Gas	Derived by Second law	1
POMD	5	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	OTHER:dPV:30%	127
POMD	6	Molar enthalpy of vaporization or sublimation, kJ/mol ; Crystal	Temperature, K; Crystal	Crystal Gas	Derived by Second law	1
POMD	6	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	OTHER:dPV:30%	152

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Vapor Pressures and Sublimation Enthalpy of Gadolinium Trichloride, Tribromide, and Triiodide and Terbium Trichloride, Tribromide, and Triiodide

Piacente, V.[Vincenzo], Scardala, P.[Paolo], Brunetti, B.[Bruno]

ABSTRACT