Specimens with Low Infrared Absorbance
In infrared-heated instruments, materials with high infrared transmittance (such as glass) or materials with high infrared reflectance (such as gold-plated coatings) exhibit significantly
low heating efficiency when exposed directly to infrared radiation. Therefore, these materials must be heated indirectly.
For instance, flat glass specimens or sheet-like specimens entirely covered with a gold-plated coating are heated by placing them on a sintered SiC specimen stage, which acts as an efficient infrared absorber.
In the case of powder samples with high infrared transmittance, they are heated utilizing a specialized, low-outgassing carbon material.
