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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

REFERENCES

1. Kolar, D., Stadier, Z., Gaberscek, S. and Suvorov, D., Ber. Deut Keram. Ges., 55, 346 (1978).Google Scholar
2. Nenasheva, E.A., Rotenber, B.A., Gindin, E.I. and Prokhvatilov, V.G., Neorg. Mater. 15, 1890 (1979).Google Scholar
3. Razgon, E.S., Gens, A.M., Varfolomeev, M.B., Korovin, S.S. and Kostomarov, V.S., Russ. J. Inorg. Chem., 25, 945 (1980).Google Scholar
4. Gens, A.M., Varfolomeev, M.B., Kostomarov, V.S. and Korovin, S.S., Russ. J. Inorg. Chem., 26, 482 (1981).Google Scholar
5. Matveeva, R G, Varfolomeev, M B and Il'yushenko, L S, trans. from Zh. Neorg Khimi., 29, 31–34 (1984).Google Scholar
6. Ohsato, H, Nishigaki, S and Okuda, T, Jpn. J Appl. Phys. 31 3136–3138 (1992).Google Scholar
7. Roth, R S, Beach, F, Santoro, A and Davis, K, Abstract 07.9.9, 14th Int. Conf. On Crystallog., Perth, Australia August 1987.Google Scholar
8. Azough, F, Champness, PE and Freer, R, J Appl. Cryst., 28, 577–581 (1995).Google Scholar
9. Azough, F., Freer, R. and Tang, C.C., Br. Ceram. Proc., 57, 111–117 (1997).Google Scholar
10. Shannon, R.D., Acta Cryst, A32, 751 (1976)Google Scholar
11. Hakki, B W and Coleman, R D, IER Trans on MTT, MTT-8, 402–410 (1960)Google Scholar
12. Ubic, R., Reaney, I. M. and Lee, W.E., J. Mater. Res. 14, 1576–1580 (1999).Google Scholar
13. Setasuwon, P., PhD Thesis, University of Manchester (1996).Google Scholar
14. Nishigaki, S., Kato, H., Yano, S. and Kamimura, R., J. Am. Ceram. Soc., 66, 1405 (1987)Google Scholar
15. Takahashi, J., Kageyama, J. and Kodaira, K., Jpn. J. Appl. Phys., 32, 4327 (1993)Google Scholar
16. Azough, F., Freer, R., Setasuwon, P., Leach, C. and Smith, P., Ceram. Trans. 100, 257–26 6 (Am. Ceram. Soc. Westerville, Ohio, 1999).Google Scholar