Thermal diffusivity is an important property that is essential for thermal designs and simulations. Reliable thermal diffusivity values are required to obtain more accurate thermal simulation results and improve thermal designs. In order to obtain reliable thermal diffusivity values, a well-validated thermal diffusivity measurement apparatus is necessary. The measurement apparatus is generally validated by certified reference materials. To validate the thermal diffusivity measurement apparatus in the thermal diffusivity measurement range of 1.0 × 10⁻⁷ m² s⁻¹ to 1.0 × 10⁻⁶ m² s⁻¹, a quartz glass reference material, which exhibited a low thermal diffusivity order was raised. A large batch of the quartz glass specimens was characterized for the certified thermal diffusivity values from room temperature (300 K) to 800 K. The large batch was also subjected to inhomogeneity and stability evaluations. The detailed characterisation ensured the traceability of the thermal diffusivity results to the International System of Units (SI). In addition, uncertainty was evaluated according to the Guide to the expression of uncertainty in measurement. The developed quartz glass certified reference material has been in supply as CRM5809-a since 2020.

热扩散率是热设计和仿真必不可少的重要属性。需要可靠的热扩散率值以获得更准确的热仿真结果并改善热设计。为了获得可靠的热扩散率值，需要一种经过充分验证的热扩散率测量设备。该测量仪器通常通过认证的参考材料进行验证。为了验证热扩散率测量装置在1.0×10 ^-7  m ²  s ^-1至1.0×10 ^-6  m ²  s ^-1的热扩散率测量范围内提出了显示低热扩散阶数的石英玻璃参考材料。对一大批石英玻璃样品进行了表征，以证明其从室温（300 K）到800 K的认证热扩散率值。还对该大批样品进行了不均匀性和稳定性评估。详细的特性确保了热扩散率结果可溯源至国际单位制（SI）。另外，根据测量不确定度表达指南对不确定度进行了评估。自2020年以来，已开发的经石英玻璃认证的参考材料已作为CRM5809-a供应。