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Effect of Divalent Dopants on Properties of Ba3.75Nd9.5Ti18O54 Microwave Dielectric Resonators

Published online by Cambridge University Press:  15 February 2011

R. Ubic ,
I. M. Reaney ,
W. E. Lee ,
J. Samuels  and
E. Evangelinost
R. Ubic
Affiliation:
Department of Engineering Materials, The University of Sheffield, Hadfield Bldg, Mappin Street, Sheffield SI 3JD (United Kingdom)
I. M. Reaney
Affiliation:
Department of Engineering Materials, The University of Sheffield, Hadfield Bldg, Mappin Street, Sheffield SI 3JD (United Kingdom)
W. E. Lee
Affiliation:
Department of Engineering Materials, The University of Sheffield, Hadfield Bldg, Mappin Street, Sheffield SI 3JD (United Kingdom)
J. Samuels
Affiliation:
Morgan Matroc Ltd. Unilator Division, Vauxhall Industrial Estate, Ruabon, Wrexham, Clwyd LL14 6HY (United Kingdom)
E. Evangelinost
Affiliation:
Morgan Matroc Ltd. Unilator Division, Vauxhall Industrial Estate, Ruabon, Wrexham, Clwyd LL14 6HY (United Kingdom)
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Abstract

Pellets in the ternary solid-solution Ba6–3xNd8+2xTi18O54 (x=0.75) have been processed to near theoretical density by mixed-oxide synthesis, and their dielectric properties determined to be εr≈89, Qf> 10,000, and τf≈+60ppm/°C at microwave frequencies. Similar ceramics with Ca, Sr, and Pb partially substituted for Ba were also processed and analysed. Both Ca and Sr were found to increase εr to 100–105 but significantly lower Qf and inflate τf. While Pb substitution also lowered Qf, it had no significant effect on εr and beneficially suppressed τf to values from -16 to +8ppm/°C, tunable with Pb content, strongly suggesting that these materials may be useful for commercial applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 495
Copyright
Copyright © Materials Research Society 1997

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References

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