Microwave dielectric properties of (1-x)CeO2-xCaTiO3 and (1-x)CeO2-xSm2O3 ceramics
CeO2-CaTiO3 and CeO2-Sm2O3 microwave dielectric ceramics were prepared by a conventional solid state ceramic route. The dielectric ceramics were characterised by XRD, SEM, Raman and microwave methods. Ceria has a relative dielectric constant, epsilon r, of 23, high dielectric quality factorxfrequenc...
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Published in | Journal of the European Ceramic Society Vol. 24; no. 9; pp. 2583 - 2589 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier
01.08.2004
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Subjects | |
Online Access | Get full text |
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Summary: | CeO2-CaTiO3 and CeO2-Sm2O3 microwave dielectric ceramics were prepared by a conventional solid state ceramic route. The dielectric ceramics were characterised by XRD, SEM, Raman and microwave methods. Ceria has a relative dielectric constant, epsilon r, of 23, high dielectric quality factorxfrequency product, Qxf up to 60000 GHz with high temperature coefficient of resonant frequency, tau f, of -53 ppm/C. The addition of CaTiO3 and Sm2O3 leads to a zero temperature variation of resonant frequency. The relative dielectric constant increases and Q decreases with CaTiO3 addition and the tau f changes from a negative to a positive value. Sm2O3 addition of up to 50 mol% increases Q, decreases epsilon r and improves the tau f. The microwave dielectric properties are measured at low temperatures down to 20 K. The effect of addition of 1 mol% of various rare earth oxides on the microwave dielectric properties of ceria was also investigated. 14 refs. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0955-2219 1873-619X |
DOI: | 10.1016/j.jeurceramsoc.2003.09.027 |