High-frequency dielectric properties of Mg-Al-Si,Ca-Al-Si and Y-Al-Si oxynitride glasses |
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Authors: | J S Thorp A B Ahmad B L J Kulesza S V J Kenmuir |
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Affiliation: | (1) Department of Applied Physics and Electronics, University of Durham, South Road, Durham, UK |
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Abstract: | Recently developed coaxial line techniques 1] have been used to determine, at room temperature, the values of the real (![epsi](/content/w64726t77x420q42/xxlarge949.gif) ) and imaginary (![epsi](/content/w64726t77x420q42/xxlarge949.gif) ') parts of the dielectric constants for some Mg-Al-Si, Ca-Al-Si and Y-Al-Si oxynitride glasses over the frequency range 500 MHz to 5 GHz. The frequency dependencies of ![epsi](/content/w64726t77x420q42/xxlarge949.gif) and ![epsi](/content/w64726t77x420q42/xxlarge949.gif) ' are consistent with the universal law of dielectric response in that (![epsi](/content/w64726t77x420q42/xxlarge949.gif) - t8)![prop](/content/w64726t77x420q42/xxlarge8733.gif) (n–1) and ![epsi](/content/w64726t77x420q42/xxlarge949.gif) '![prop](/content/w64726t77x420q42/xxlarge8733.gif) (n–1) for all glass compositions; the high experimental value of the exponent (n=1.0±0.1) suggests the limiting form of lattice loss 2] situation. In this frequency range, as previously reported 3] at longer wavelengths, the addition of nitrogen increases the dielectric constant, (![epsi](/content/w64726t77x420q42/xxlarge949.gif) ); in both the oxide and oxynitride glasses ![epsi](/content/w64726t77x420q42/xxlarge949.gif) is also influenced by the cation, being increased with cation type in the order magnesium, yttrium, calcium as at lower frequencies. |
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