Temperature‐Dependent Optical Reflectivity of Tetragonal‐Prime Yttria‐Stabilized Zirconia

The optical reflectance of dense, metastable, tetragonal‐prime zirconia plates, made by densifying electron beam physical vapor‐deposited powder, is reported as a function of temperature up to 1673 K (1400°C) over the range of 400–1500 cm −1 (6.67–25 μm). Curve fitting of the reflectance as a function of temperature was performed using two different damped oscillator models, each with three infrared (IR)‐active modes. Oscillator parameters were then used to calculate the values of the indices of refraction and absorption as a function of temperature using the classical dispersion theory. The reflectance data of tetragonal‐prime yttria‐stabilized zirconia at room temperature are qualitatively similar to that reported for the equilibrium tetragonal phase in that it can be fit with three IR‐active modes.