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Connection between Near Millimeter Range Dielectric Loss and High Frequency Acoustic Attenuation

Published online by Cambridge University Press:  18 March 2011

Boris M. Garin ,
Sergey N. Ivanov ,
Efim N. Khazanov  and
Ivan P. Nikitin
Boris M. Garin
Affiliation:
Institute of Radio Engineering and Electronics of Russian Academy of Sciences 11, Mokhovaya str., Moscow 103907, Russia, Tel.: +7(095)203-4774, Fax: +7(095)203-8414, E-mail: ivanov@mail.cplire.ru
Sergey N. Ivanov
Affiliation:
Institute of Radio Engineering and Electronics of Russian Academy of Sciences 11, Mokhovaya str., Moscow 103907, Russia, Tel.: +7(095)203-4774, Fax: +7(095)203-8414, E-mail: ivanov@mail.cplire.ru
Efim N. Khazanov
Affiliation:
Institute of Radio Engineering and Electronics of Russian Academy of Sciences 11, Mokhovaya str., Moscow 103907, Russia, Tel.: +7(095)203-4774, Fax: +7(095)203-8414, E-mail: ivanov@mail.cplire.ru
Ivan P. Nikitin
Affiliation:
Institute of Radio Engineering and Electronics of Russian Academy of Sciences 11, Mokhovaya str., Moscow 103907, Russia, Tel.: +7(095)203-4774, Fax: +7(095)203-8414, E-mail: ivanov@mail.cplire.ru
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Abstract

A series of crystalline isomorphic solid solutions of Yttrium-Lutetium Aluminum Garnets (Y1−cLuc)3Al5O12 (c = 0 – 1) has been studied. The measurements of dielectric loss (DL) tangent tgδ has been performed at electromagnetic wavelengths 1 – 0.6 mm and temperature T = 300 K. The results obtained has been compared with longitudinal acoustic waves (AW) attenuation data for frequencies f = 1 – 9.4 GHz, T = 4.2 – 300 K and with theory. The correlation between the DL and the AW attenuation is observed. The dependencies of DL (at T = 300 K) and AW attenuation (at T > 77 K) on concentration c are qualitatively identical in the whole interval c = 0 – 1. From comparison with theory it follows that the observed DL is due to the two-phonon intrinsic lattice loss. It is caused by the lattice anharmonicity as well as the AW attenuation at not too low temperatures. Also the prediction for concentration dependence of DL at very low temperatures is discussed that follows from comparison with the results of “heat pulse” propagation experiments for the same samples at T = 2 K and theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 656: Symposium DD – Materials Issues for Tunable RF and Microwave Devices II , 2000 , DD4.3
Copyright
Copyright © Materials Research Society 2001

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References

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