통합 검색 | Korea Science

노현지;남성필;이성갑;김대영;배선기;이영희
- 한국전기전자재료학회:학술대회논문집
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- 한국전기전자재료학회 2009년도 하계학술대회 논문집
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- pp.180-181
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- 2009
$(Ba_{0.6},Sr_{0.3}Ca_{0.1})TiO_3$ powders, which were prepared by sol-gel method using a solution of Ba-acetate, Sr-acetate and Ca-acetate and Ti iso-propoxide, $(Ba_{0.6},Sr_{0.3}Ca_{0.1})TiO_3$ array thick films doped with 0.1 mol% $MnCO_3$ and $Yb_2O_3$ (0.1~0.7 mol%) were fabricated by the screen printing method on the alumina substrate. And the structural and electrical properties as a function of $Yb_2O_3$ amount were investigated. The thickness of all (Ba,Sr,Ca)$TiO_3$ thick films was approximately 60mm. The Curie temperature of doped with 0.1 mol% $Yb_2O_3$ specimen was $45^{\circ}C$, and the dielectric constant and at this temperature was 1062.
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김인성;민복기;송재성;전소현
- 대한전기학회:학술대회논문집
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- 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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- pp.2013-2015
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- 2005
In this paper, Effect of $BaSrTiO_3/Li_2CO_3$ on low temperature sintering and dielectric property of thick films has been investigated for variable capacitor on high frequency. The thick films were fabricated by the tape casting and then the structural and dielectric properties as a function of an addition composition ratio and sintering temperature were studied. For the thick film sintered at $1050^{\circ}C$, it was densified to 96% of $BaSrTiO_3$ theoretical density by the addition of 10 $wt{\cdot}%$ $BaSrTiO_3/Li_2CO_3$. Dielectric constant increased and Curie temperature lowered with the increased of $BaSrTiO_3/Li_2CO_3$ content, which probably can be explained by the substitution of $Ba^{3+},Li^{1+}$ on $RaTiO_3$ lattice. The tunability and dielectric loss of the $BaSrTiO_3/Li_2CO_3$ thick film, sintered at $1350^{\circ}C$, were about 26% and 0.234 at $10{\sim}15MHz$, respectively.
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이상철;임성수;정장호;배선기;이영희
- 한국전기전자재료학회:학술대회논문집
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- 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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- pp.649-652
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- 1999
The (Ba, Sr)TiO$_3$(BST) thin films were fabricated on Pt/Ti/SiO$_2$/Si substrate by RF sputtering technique. The structural properties of the BST thin films were investigated with substrate temperature by XRD, SEM, EDS and AES depth profils. Increasing the substrate temperature, barium multi titanate phases were decreased. The BST thin film had a structure of perovskite type, and had peaks of (100), (200) at the substrate temperature of 50$0^{\circ}C$. When the BST thin films were deposited at the substrate temperature of 50$0^{\circ}C$, the composition ratio of Ba/sr was 52/48.
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