DC bulk conductive ceramic with low RF and microwave loss
Abstract
A DC conductive, low RF/microwave loss titanium oxide ceramic provides, at room temperature, a bulk DC resistivity of less than 1×1011 ohm-meters and an RF loss tangent of less than 2×10−4 at 7.5 GHz and less than 2×10−5 at 650 MHz. The resistivity is reduced by oxygen vacancies and associated Ti3+ and/or Ti4+ 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 Mg2TiO4—MgTiO3 embodiment includes mixing, grinding, pre-sintering in air, and pressing 99.95% pure MgO and TiO2 powders, re-sintering in air at 1400° C.-1500° C. to reduce porosity, and sintering at 1350° C.-1450° C. for 4 hours in an 0.05% oxygen and 99.05% nitrogen atmosphere.
- Inventors:
- Issue Date:
- Research Org.:
- Euclid Techlabs, LLC, Solon, OH (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 2293661
- Patent Number(s):
- 11773026
- Application Number:
- 17/019,441
- Assignee:
- Euclid Techlabs, LLC (Solon, OH)
- DOE Contract Number:
- SC0017150
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 09/14/2020
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Kanareykin, Alexei, and Nenasheva, Elizaveta Arkadievna. DC bulk conductive ceramic with low RF and microwave loss. United States: N. p., 2023.
Web.
Kanareykin, Alexei, & Nenasheva, Elizaveta Arkadievna. DC bulk conductive ceramic with low RF and microwave loss. United States.
Kanareykin, Alexei, and Nenasheva, Elizaveta Arkadievna. Tue .
"DC bulk conductive ceramic with low RF and microwave loss". United States. https://www.osti.gov/servlets/purl/2293661.
@article{osti_2293661,
title = {DC bulk conductive ceramic with low RF and microwave loss},
author = {Kanareykin, Alexei and Nenasheva, Elizaveta Arkadievna},
abstractNote = {A DC conductive, low RF/microwave loss titanium oxide ceramic provides, at room temperature, a bulk DC resistivity of less than 1×1011 ohm-meters and an RF loss tangent of less than 2×10−4 at 7.5 GHz and less than 2×10−5 at 650 MHz. The resistivity is reduced by oxygen vacancies and associated Ti3+ and/or Ti4+ 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 Mg2TiO4—MgTiO3 embodiment includes mixing, grinding, pre-sintering in air, and pressing 99.95% pure MgO and TiO2 powders, re-sintering in air at 1400° C.-1500° C. to reduce porosity, and sintering at 1350° C.-1450° C. for 4 hours in an 0.05% oxygen and 99.05% nitrogen atmosphere.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2023},
month = {10}
}
Works referenced in this record:
Titania-Half Metal Composites as High-Temperature Thermoelectric Materials
patent-application, June 2010
- Backhaus-Ricoult, Monika
- US Patent Application 12/333670; 20100147348