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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hartnett, John G.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2011Microwave properties of semi-insulating silicon carbide between 10 and 40 GHz and at cryogenic temperaturescitations
- 2010Detrapping and retrapping of free carriers in nominally pure single crystal GaP, GaAs, and 4H–SiC semiconductors under light illumination at cryogenic temperaturescitations
- 2009Measurements of the complex permittivity and the complex permeability of low and medium loss isotropic and uniaxially anisotropic metamaterials at microwave frequenciescitations
- 2008Modified permittivity observed in bulk gallium arsenide and gallium phosphide samples at 50 K using the whispering gallery mode methodcitations
- 2004The microwave Characterization of Single Crystal Lithium and Calcium Fluoride at Cryogenic Temperaturescitations
- 2004The dependence of the permittivity of sapphire on thermal deformation at cryogenic temperaturescitations
- 2003Lithium tantalate - a high permittivity dielectric material for microwave communication systemscitations
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article
The microwave Characterization of Single Crystal Lithium and Calcium Fluoride at Cryogenic Temperatures
Abstract
The whispering-gallery mode method is used for very accurate permittivity and dielectric loss measurements of single crystal lithium fluoride (LiF) and calcium fluoride (CaF/sub 2/) over the temperature range of 4.5 K to 300 K. The absolute uncertainty in the real part of permittivity was estimated to be less than 0.1%, and it was limited principally by uncertainty in dimensions of the samples. Dielectric losses were measured with uncertainties of about 10% limited by the accuracy of Q-factor measurements. The measured materials exhibited dielectric losses between 2-4 /spl times/ 10/sup -7/ near 5 K. The relative permittivity was evaluated as 6.502 (4.9 K) to 6.844 (296 K) at 17.5 GHz for CaF/sub 2/ and 8.534 (4.6 K) to 9.063 (300 K) at 13.5 GHz for LiF.