PAS determination of the vacancy formation enthalpy in tungsten

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5757142

Smedskjaer, L C

A measurement of the vacancy formation enthalpy in 99.999 wt % pure tungsten under thermal equilibrium conditions was made using the positron anihilation spectroscopy (PAS) Doppler-broadening technique. Temperatures were measured by optical pyrometry, with calibrations against a W(Re) thermocouple, the tantalum melting point, and the power delivered to the sample. A trapping-model analysis of the PAS data from the temperature range 300 to 3633 K yielded a vacancy formation enthalpy of 3.76 +- 0.39 eV. Comparisons are made between the present result and the other available results on vacancy formation in tungsten.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5757142
• Report Number(s): CONF-850169-9; ON: DE85010283
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DOPPLER BROADENING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENTHALPY
FERMIONS
FORMATION HEAT
INTERACTIONS
LEPTONS
LINE BROADENING
METALS
PHYSICAL PROPERTIES
POINT DEFECTS
POSITRONS
REACTION HEAT
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TUNGSTEN
VACANCIES