Determination of thermal conductivity tensor and heat capacity of insulating solids

• Specific heat capacity ρcp and thermal conductivity components λij for several classes of anisotropic crystals as well as isotropic materials may be determined by a transient method. The specimen is ground flat, the boundary plane being oriented parallel to two principal axes of the conductivity tensor. Two parallel metal strips in one of the principal directions are evaporated on to this surface. One is heated with a constant DC power, the other is used as an AC-driven resistance thermometer. It is shown that the temperature variation measured in response to a heat pulse permits λ and ρcp to be determined if the specimen is isotropic. If it is anisotropic, two parameters of the type λllλ33 and λll/ρc are obtained. Additional measurements with the strips deposited in the other principal directions enable λll, λ22, λ33 and ρcp to be calculated.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

Thermal conductivity

thermal conductivity tensor

anisotropy

specific heat

heat capacity

Publication and Content Type

ref (subject category)

art (subject category)