Effects of Nd/Sm ratio and glass addition on the microwave dielectric properties of Ba4.5(Sm(0.8-x)NdxBi0.2)9Ti18O54 ceramics

In this study, Ba4.5(Sm(0.8-x)NdxBi0.2)9Ti18O54 ceramics with various amounts of glass were prepared. The effects of Nd/Sm ratio and glass content on the microstructure evolution and microwave dielectric properties were evaluated. SEM micrographs revealed that the microstructures of Ba4.5(Sm(0.8-x)N...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 468; no. 1-2; pp. 522 - 527
Main Authors WU, Yu-Chuan, WANG, Sea-Fue, WANG, Yuh-Ruey, WU, Wen-Jung
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier 22.01.2009
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Permittivity (dielectric function)
Physics
Grain size
Scanning electron microscopy
Addition
Microwave radiation
Dielectric properties
X-ray diffraction
Titanates
XRD
Ceramics
Dielectric response
Precipitation
Sintering
Chemical composition
Microstructure
Permittivity
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Summary:In this study, Ba4.5(Sm(0.8-x)NdxBi0.2)9Ti18O54 ceramics with various amounts of glass were prepared. The effects of Nd/Sm ratio and glass content on the microstructure evolution and microwave dielectric properties were evaluated. SEM micrographs revealed that the microstructures of Ba4.5(Sm(0.8-x)NdxBi0.2)9Ti18O54 ceramics with 4 wt.% glass sintered at 1150 deg C are uniform and their grain sizes range from 1 to 3 mum. The dielectric constant of Ba4.5(Sm(0.8-x)NdxBi0.2)9Ti18O54 ceramics increased with increasing sintering temperature or the Nd content, and the tauf value also increases with increasing Nd content. With 6 -10 wt.% glass added, Ba4.5(Sm0.24Nd0.56Bi0.2)9Ti18O54 ceramics obtain maximum densities at 1100 deg C. No second phase was detected in the XRD patterns. Grains are columnar-like and grain size increases significantly with increasing glass content and sintering temperature. The results showed that Ba4.5(Sm0.24Nd0.56Bi0.2)9Ti18O54 ceramics with 2 wt.% glass sintered at 1150 deg C had a sintering density of 5.6 g/cm3, dielectric constant of 87.9, Q*f of 2523 GHz, and tauf of 22.8 ppm/ deg C.
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ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2008.01.099