{"title":"Dielectric Properties of (Ba, Sr, Ca)TiO3 Ceramics for Tunable Microwave Devices","authors":"Bing Qin, D. Jin, Jinrong Cheng, Z. Meng","doi":"10.1109/ISAF.2006.4387908","DOIUrl":null,"url":null,"abstract":"(Ba<sub>0.9-x</sub>Sr<sub>x</sub>Ca<sub>0.1</sub>)TiO<sub>3</sub> (x=0.25~0.5) and (Ba<sub>0.6-y</sub>Sr<sub>0.4</sub>Ca<sub>y</sub>)TiO<sub>3</sub> (y=0.05~0.2) ceramics were fabricated by the mixed-oxide method. All BSCT specimens owned dense and homogeneous structure without the second phase. By comparing the properties of (Ba<sub>0.9-x</sub>Sr<sub>x</sub>Ca<sub>0.1</sub>)TiO<sub>3</sub> and (Ba<sub>0.6-y</sub>Sr<sub>0.4</sub>Ca<sub>y</sub>)TiO<sub>3</sub>, we found that the influence of Ba/Sr ratio on Curie temperature is greater than that of Ba/Ca ratio. The increasing of Ca content could decrease the dielectric loss and dielectric constants, but it would decrease the tunability as well. (Ba<sub>0.55</sub>Sr<sub>0.4</sub>Ca<sub>0.05</sub>)TiO<sub>3</sub> and (Ba<sub>0.5</sub>Sr<sub>0.4</sub>Ca<sub>0.1</sub>)TiO<sub>3</sub> are expected to be the candidate materials for microwave tunable devices, whose tunability, dielectric constant and loss were 24.1%, 4300, 0.28% and 16.5%, 3200, 0.096% respectively.","PeriodicalId":441219,"journal":{"name":"2006 15th ieee international symposium on the applications of ferroelectrics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2006 15th ieee international symposium on the applications of ferroelectrics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ISAF.2006.4387908","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
(Ba0.9-xSrxCa0.1)TiO3 (x=0.25~0.5) and (Ba0.6-ySr0.4Cay)TiO3 (y=0.05~0.2) ceramics were fabricated by the mixed-oxide method. All BSCT specimens owned dense and homogeneous structure without the second phase. By comparing the properties of (Ba0.9-xSrxCa0.1)TiO3 and (Ba0.6-ySr0.4Cay)TiO3, we found that the influence of Ba/Sr ratio on Curie temperature is greater than that of Ba/Ca ratio. The increasing of Ca content could decrease the dielectric loss and dielectric constants, but it would decrease the tunability as well. (Ba0.55Sr0.4Ca0.05)TiO3 and (Ba0.5Sr0.4Ca0.1)TiO3 are expected to be the candidate materials for microwave tunable devices, whose tunability, dielectric constant and loss were 24.1%, 4300, 0.28% and 16.5%, 3200, 0.096% respectively.
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