Thermal and electrical conductivities of high purity tantalum

Technical Report · Sun Jan 01 04:00:00 EST 1978

DOI:https://doi.org/10.2172/5005603· OSTI ID:5005603

Archer, S. L.

The electrical resistivity and thermal conductivity of three high purity tantalum samples have been measured as functions of temperature over a temperature range of 5K to 65K. Sample purities ranged up to a resistivity ratio of 1714. The highest purity sample had a residual resistivity of .76 x 10/sup -10/OMEGA-m. The intrinsic resistivity varied as T/sup 3/./sup 9/ from 10K to 31K. The thermal conductivity of the purest sample had a maximum of 840 W/mK at 9.8K. The intrinsic thermal resistivity varied as T/sup 2/./sup 4/ from 10K to 35K. At low temperatures electrons were scattered primarily by impurities and by phonons with both interband and intraband transitions observed. The electrical and thermal resistivity is departed from Matthiessen's rule at low temperatures.

• Research Organization: Ames Lab., Iowa (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5005603
• Report Number(s): IS-T-809
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
IMPURITIES
LOW TEMPERATURE
METALS
PHYSICAL PROPERTIES
REFRACTORY METALS
TANTALUM
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
VERY LOW TEMPERATURE