Thermochemical properties of gaseous TiCl, TiCl{sub 2}, and TiCl{sub 3}

Journal Article · Mon Apr 01 04:00:00 EST 1996 · High Temperature and Materials Science

OSTI ID:376333

Hildenbrand, D L ^[1]

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1. SRI International, Menlo Park, CA (United States)

Gaseous equilibria involving TiCl, TiCl{sub 2}, and TiCl{sub 3} were studied by mass spectrometry using an effusive source in which Ti(s) was chlorinated with AgCl vapor. The three Ti lower chlorides were identified unambiguously, and their thermochemical properties were derived from reaction equilibria involving gaseous Ag and AgCl as reaction partners. Thermal functions of the three Ti-Cl species used in the analysis were recalculated with spectroscopic and molecular constants that yield larger vibrational and electronic partition functions than those in earlier tables. Bond dissociation energies at 298 K, evaluated from the derived reaction enthalpies, were 96.9, 121.3, 100.9, and 92.8 kcal/mol for the bonds Ti-Cl, ClTi-Cl, Cl{sub 2}Ti-Cl, and Cl{sub 3}Ti-Cl, respectively, all {+-}2.5 kcal/mol. The standard enthalpies of formation of the gaseous species at 298 K were derived as TiCl, 45.3 {+-} 2.5; TiCl{sub 2}, {minus}47.0 {+-} 3.5; and TiCl{sub 3}, {minus}118.9 {+-} 4.3, all in kcal/mol.

• OSTI ID: 376333
• Journal Information: High Temperature and Materials Science, Journal Name: High Temperature and Materials Science Journal Issue: 2 Vol. 35; ISSN HTMSFP; ISSN 1080-1278
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
CHEMICAL PROPERTIES
CHEMICAL VAPOR DEPOSITION
DISSOCIATION ENERGY
FORMATION HEAT
PRECURSOR
THERMODYNAMIC PROPERTIES
TITANIUM
TITANIUM CHLORIDES