It is in the thickness direction. However, if the sample is anisotropic, the thermal conductivity will be affected by the thermal conductivity in the in-plane direction.
FAQThermal Measuring Instruments (WBGT and QTM)
Thermal Measuring Instruments (WBGT and QTM)
Q
With QTM measurements, is the thermal conductivity for film-shaped samples in the thickness direction, or is it in the in-plane (X-Y) direction?
A
