Title

Vaporization Of Compound And Alloys At High Temperature Part I. Mass Spectrometric Determination of the Dissociation Energies of the Molecules AgAu, AgCu, AuCu

Date

1960

Index Abstract

Contrails and DTIC

Photo Quality

Not Needed

Report Number

WADD TR 60-782 Part I

Creator

Ackerman, Marcel

Drowart, J.

Stafford, Fred E.

Corporate Author

University of Brussels

Laboratory

Materials Central

Extent

30

Identifier

AD0297959

AD0297959

Access Rights

OTS

Distribution Classification

1

Contract

AF 61(052)-225

DoD Project

7350

DoD Task

73500

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

None

Report Availability

Full text available

Date Issued

1960-11

Abstract

The vapors issuing from mullite and Graphite Knudsen cells containing pure metals and alloys of the triad Cu-Ag-Au have been analyzed mass spectrometrically. From the experimental ratios of diatomic to monoatomic species and the vapor prssures of the elements, the following dissociation energies are obtained:
D°0(Cu2) = 43.2 ± 2.2 kcal D°0 (AgAu) = 47.6 ± 2.2 D°0(Ag2) = 35.7 ± 2.2 kcal D°0 (AgCu) = 40.6 ± 2.2 D°0(Au2) = 51.9 ± 2.2 kcal D°0 (AgCu) = 54.3 ± 2.2
These are based on Hvap298 = 81.1, 68.4 and 87.5 cal/mole for Cu, Ag and Au where D0 of AgAu depends on the value for Cu, and D°0 of AgAu and AuCu on Au. The uncertainties quote do not include the uncertainty in ΔHvap.
These result are interpreted in terms of chemical bonding theories. The relation between bonding in the gas and in the pure condensed phases is again observed. Furthermore, a previously unobserved qualitative relation between the dissociation energy of the asymmetrical molecule and the heat of formation of the corresponding alloys is indicated

Publisher

Wright-Patterson Air Force Base, OH : Wright Air Development Division, Air Research and Development Command, United States Air Force

Distribution Conflict

No

Provenance

IIT

Type

report

Subject

Thermochemistry

Dissociation

Mass Spectroscopy

High Temperature

Alkali Metals

Alloys

Copper Alloys

Energy

Experimental Data

Gold Alloys

Heat Of Sublimation

Silver Alloys

Format

1 online resource