DC bulk conductive ceramic with low RF and microwave loss
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2024-03-25 |
| Journal | OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) |
| Authors | Alexei Kanareykin, Elizaveta Nenasheva |
Abstract
Section titled āAbstractāA DC conductive, low RF/microwave loss titanium oxide ceramic provides, at room temperature, a bulk DC resistivity of less than 1Ć10<sup>11</sup> ohm-meters and an RF loss tangent of less than 2Ć10<sup>ā4</sup> at 7.5 GHz and less than 2Ć10<sup>ā5</sup> at 650 MHz. The resistivity is reduced by oxygen vacancies and associated Ti<sup>3+</sup> and/or Ti<sup>4+</sup> centers created by sintering in an atmosphere containing only between 0.01% and 0.1% oxygen. The reduced resistivity prevents DC charge buildup, while the low loss tangent provides good RF/microwave transparency and low losses. The ceramic is suitable for forming RF windows, electron gun cathode insulators, dielectrics, and other components. An exemplary Mg<sub>2</sub>TiO<sub>4</sub>āMgTiO<sub>3</sub> embodiment includes mixing, grinding, pre-sintering in air, and pressing 99.95% pure MgO and TiO<sub>2</sub> powders, re-sintering in air at 1400Ā° C.-1500Ā° C. to reduce porosity, and sintering at 1350Ā° C.-1450Ā° C. for 4 hours in an 0.05% oxygen and 99.05% nitrogen atmosphere.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal Sourceā- DOI: None