Vapor pressures and thermodynamic properties of lanthanide triiodides

Study of Molecular and Ionic Vapor Composition over CeI3by Knudsen Effusion Mass Spectrometry

“…Temperature The standard deviation is given with a "±" sign. dependencies from the work of Hirayama et al [2], Villani et al [7], and Ohnesorge [6] lie below those obtained in this work. The fraction of the dimer molecules measured in this work and in [6] is about the same whereas the absolute pressures differ considerably.…”

“…In the latter case, the ions are drawn out from the cell by a weak electric field (10 4 -10 5 V/m) applied between the cell and the collimator (1). The sample (2) was placed into a molybdenum cell (3) under dry conditions in a glove box and then transferred into the vaporization chamber of the mass spectrometer and evacuated. The lid of the cell had the cylindrical effusion orifice (Ø 0.3 × 0.8 mm).…”

“…Vaporization thermodynamics of cerium triiodide is the focus of researcher's attention so far. The first measurements of vapor pressure over CeI 3 were carried out by Knudsen effusion mass spectrometry (KEMS) [1] and Knudsen effusion Cahn microbalance [2] techniques. Further KEMS studies were performed by Chantry [3,4], Struck and Feuersanger [5], and Ohnesorge [6].…”

“…In addition the vapor pressure of CeI 3 was determined by the torsion method [7], by optical absorption spectra [8], and recently by X-ray induced fluorescence [9]. In spite of the numerous experimental results [1][2][3][4][5][6][7][8][9], data on the vapor composition over CeI 3 are very scanty. Moreover, information on the ionic species in saturated vapor over CeI 3 is absent so far.…”

Thermodynamic Properties of the Melt of the NaI — DyI3 System

“…Section 3.3), agrees within the given error limits with the total pressure of 3.2 Pa at 1000 K determined by Dettingmeijer [22] by the investigation of the vaporization of Dy13(s) by the mass-loss Knudsen effusion method. The value of 5.1 Pa obtained by Hirayama et al [23] with the same method is comparatively high. Fig.…”