Cryogenic complex anisotropic permittivity of magnesium fluoride

Jacob, Mohan V., Krupka, Jerzy, Mazierska, Janina, and Woods, Graham (2006) Cryogenic complex anisotropic permittivity of magnesium fluoride. Materials Science and Engineering: A , 427 (1). pp. 175-180.

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The complex tensor permittivity of MgF2 has been measured using whispering gallery mode and quasi TE0np dielectric post resonator techniques as a function of frequency and temperature. MgF2 exhibits uniaxial anisotropy. At room temperature permittivity component parallel to the anisotropy axis is 4.77 ± 0.2% and the component perpendicular to anisotropy axis is 5.49 ± 0.2%. Dielectric loss tangent component perpendicular to anisotropy axis is approximately 4 × 10−5 and dielectric loss tangent component parallel to anisotropy axis is approximately 7 × 10−5 at 39 GHz and room temperature. Losses at room temperature increase quasi-linearly with frequency. At the temperature of 15 K measured loss tangent values for both the components of the dielectric loss tangent were about 1 × 10−6 at 39 GHz. The RF and microwave losses of magnesium fluoride (MgF2) crystal are low as compared with other commonly used Fluorides. MgF2 is hygroscopic and dielectric losses of this material vary with the contents of water.

Item ID: 3928
Item Type: Article (Research - C1)
ISSN: 1873-4936
Keywords: microwave loss; dielectric resonators; loss tangent; magnesium fluoride; complex permittivity;
Date Deposited: 18 Nov 2009 00:40
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091201 Ceramics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 60%
86 MANUFACTURING > 8617 Communication Equipment > 861799 Communication Equipment not elsewhere classified @ 40%
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