Measurements of Dielectric Constant of Rutile (TiO2) at Microwave Frequencies between 4.2° and 300°K

Abstract
The microwave dielectric constant k′ and loss tangent (tanδ) of rutile have been measured as a function of temperature from 4.2° to 300°K. At low temperatures, k′ approaches the limiting value of 256 in the c direction and 131 in the a direction. The loss tangent at 4.2°K is 2.5×10−6 for pure rutile and increases by an order of magnitude for both 0.12% chromium and 0.2% iron‐doped rutile.

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