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NEXCERA is a machinable and highly polishable ceramic with attractiveproperties for use in precision instruments, in particular because itscoefficient of thermal expansion exhibits a zero crossing at room temperature.We performed an accurate measurement of the long-term drift of the length of a12~cm long NEXCERA block by using it as a spacer of a high-finesse opticalcavity. At room temperature, we found a fractional length drift rate$L^{-1}d\Delta L/dt=-1.74\times10^{-8}~\mathrm{yr}^{-1}$.

Characterization of the long-term dimensional stability of a NEXCERA block using the optical resonator technique