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Isovalent Substitution of Sr for Ba in Ba3.75Nd9.5Ti18O54 Microwave Dielectric Ceramics – Experimental and Computer Modelling Studies

Published online by Cambridge University Press:  10 February 2011

Paisan Setasuwon ,
Robert Freer ,
Feridoon Azough  and
Colin Leach
Paisan Setasuwon
Affiliation:
Materials Science Centre, University of Manchester/UMIST Grosvenor Street, Manchester, M1 7HS, UK
Robert Freer
Affiliation:
Materials Science Centre, University of Manchester/UMIST Grosvenor Street, Manchester, M1 7HS, UK
Feridoon Azough
Affiliation:
Materials Science Centre, University of Manchester/UMIST Grosvenor Street, Manchester, M1 7HS, UK
Colin Leach
Affiliation:
Materials Science Centre, University of Manchester/UMIST Grosvenor Street, Manchester, M1 7HS, UK
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Abstract

Ceramics of Ba3.75Nd9.5Ti18O54 substituted with 2, 5, 10, 20 and 50% Sr have been prepared by the mixed oxide route. Specimens were sintered at temperatures in the range 1350–1500°C. Densities were ∼95% theoretical. The solubility limit for Sr replacing Ba was found to be ∼10%. The relative permittivity (∼80) was almost independent of Sr content, but 2% Sr increased the Qxf value to a maximum of 11000. Static simulation of Sr- bearing Ba3.75Nd9.5Ti18O54 successfully reproduced the structure and lattice parameters to within 1–2%. Different site distributions of Ba-Sr ions have been explored.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 631: Symposium AA – Millimeter-/Submillimeter-Wave Technology Materials, Devices and Diagnostics , 2000 , AA2.7
Copyright
Copyright © Materials Research Society 2000

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References

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