Low Temperature Permittivity and Loss Tangent of Zirconia from 220 to 325 GHz

Zirconia rotors are used extensively as sample holders in present- day DNP NMR research. The samples are irradiated by a THz beam that must pass through the wall of the rotor. The design of these rotors thus depends critically on knowing the dielectric constants of the zirconia material. We present the first high-accuracy experimental measurements of the permittivity and loss tangent of YTZP Zirconia in the 220-325 GHz frequency range. The measurements were made from room temperature down to 79 K.