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Loss spectra of pure and La-doped MgTiO3 microwave ceramics

Published online by Cambridge University Press:  03 March 2011

V.M. Ferreira ,
J.L. Baptista ,
J. Petzelt ,
G.A. Komandin  and
V.V. Voitsekhovskii
V.M. Ferreira
Affiliation:
Departamento de Engenharia Cerâmica e Vidro/INESC, Universidade de Aveiro, 3800 Aveiro, Portugal
J.L. Baptista
Affiliation:
Departamento de Engenharia Cerâmica e Vidro/INESC, Universidade de Aveiro, 3800 Aveiro, Portugal
J. Petzelt
Affiliation:
Institute of Physics, Czech Academy of Sciences, Na Slovance 2. 18040 Prague 8, Czech Republic
G.A. Komandin*
Affiliation:
Institute of Physics, Czech Academy of Sciences, Na Slovance 2. 18040 Prague 8, Czech Republic
V.V. Voitsekhovskii*
Affiliation:
Institute of Physics, Czech Academy of Sciences, Na Slovance 2. 18040 Prague 8, Czech Republic
*
a)On leave from the Institute of General Physics, Russian Academy of Sciences, Vavilov Street 38, 177333 Moscow, Russia.
a)On leave from the Institute of General Physics, Russian Academy of Sciences, Vavilov Street 38, 177333 Moscow, Russia.
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Abstract

Pure and La-doped magnesium titanate (MgTiO3) microwave ceramics were sintered and structurally and dielectrically characterized. Doping provides small inclusions of a second phase found to correspond to the La2Ti2O7 compound. It increases the microwave dielectric loss appreciably and gives rise to three absorption peaks in the submillimeter range assigned to polar phonons of the La2Ti2O7 structure. This assignment was confirmed by a direct reflectivity measurement on La2Ti2O7 ceramics. From the temperature dependence of submillimeter losses in the pure sample, one can estimate that from 1000 down to at least 8 GHz about half of the room temperature losses are intrinsic, i.e., due to two-phonon absorption processes.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 9 , September 1995 , pp. 2301 - 2305
Copyright
Copyright © Materials Research Society 1995

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