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http://dx.doi.org/10.4191/KCERS.2006.43.7.421

Curie Temperature and Tunable Dielectric Properties of Barium Strontium Titanate Thick Films  

Jeon, So-Hyun (Department of Materials Engineering, Kyungnam University)
Kim, In-Sung (Electric and Magnetic Devices Group, Korea Electrotechnology Research Institute)
Min, Bok-Ki (Electric and Magnetic Devices Group, Korea Electrotechnology Research Institute)
Song, Jae-Sung (Electric and Magnetic Devices Group, Korea Electrotechnology Research Institute)
Yoon, Jon-Do (Department of Materials Engineering, Kyungnam University)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.7, 2006 , pp. 421-426 More about this Journal
Abstract
[ $(BaSr)TiO_3$ ] thick films were prepared by tape casting method, using $BaTiO_3\;and\;SrTiO_3$ powder slurry in order to investigate dielectric properties i.e. dielectric constant, ${\varepsilon}_r$, Curie temperature, $T_c$. Grain growth within $(BaSr)TiO_3$ thick films was observed with increasing weight ratio of $BaTiO_3$. This observation can be explained by phenomena of substitution of $Sr^{2+}$ ion for $Bi^{2+}$ ion in the $BaTiO_3$ system. Also, the Curie temperature in $(BaSr)TiO_3$ thick films was shifted to lower temperature range with increasing $ SrTiO_3$. Furthermore, Curie temperature having maximum dielectric constant was in the range of $-40^{\circ}C\;to\;30^{\circ}C$, and hence sharper phase transformation occurred at Curie temperature. There occurred decrease in tunability and k-factor of $(Ba_{0.6}Sr_{0.4})TiO_3$ calculated from the dielectric constant, ${\varepsilon}_r$ above Curie temperature. In addition, above the $60^{\circ}C$, phase fixation was observed. This means that internal stress relief occurred with increasing $90^{\circ}$ domains.
Keywords
BST; Thick films; Curie temperature; Tunability; Dielectric properties;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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