• 제목/요약/키워드: $TiO_{2}$-$SnO_{2}$

검색결과 254건 처리시간 0.038초

Ni가 첨가된 $(Zr_{0.8}Sn_{0.2})$TiO$_4$세라믹스의 미세구조와 고주파유전성질 (Microstructure and Microwave Dielectric Properties of Ni-doped $(Zr_{0.8}Sn_{0.2})$TiO$_4$ Ceramics)

  • 이달원;남산;변재동;김명호
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1996년도 추계학술대회 논문집
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    • pp.59-62
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    • 1996

  • The effect of NiO addition on the microstructure and microwave dielectric properties of (Zr$_{0.8}$Sn$_{0.2}$)TiO$_4$(ZST) was investigated. With the NiO addition, a dense ZST body of density higher than 95% has been achieved in the sintering temperature range of 1400 to 150$0^{\circ}C$. Energy dispersive X-ray spectrometry (EDS) analysis of sintered specimen shows the presence of second phase at grain boundaries, which is considered to be NiTiO$_3$. Dielectric constant of the specimen is found to increase linearly with density. Q-values and TC$_{f}$decrease with increasing NiO content. The variation of dielectric properties with NiO content is discussed in term of the second phase. The ZST ceramics with small amount of additive gave $\varepsilon$$_{r}$=38, Q=7000 at 7 GHz and TC$_{f}$=-0.5 ppm/$^{\circ}C$, comparable with the values obtained by previous investigation.stigation.

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Influence of Nanoporous Oxide Substrate on the Performance of Photoelectrode in Semiconductor-Sensitized Solar Cells

  • Bang, Jin Ho
    • Bulletin of the Korean Chemical Society
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    • 제33권12호
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    • pp.4063-4068
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    • 2012

  • Oxide substrates in semiconductor-sensitized solar cells (SSSCs) have a great impact on their performance. $TiO_2$ has long been utilized as an oxide substrate, and other alternatives such as ZnO and $SnO_2$ have also been explored due to their superior physical properties over $TiO_2$. In the development of high-performance SSSCs, it is of significant importance to understand the effect of oxides on the electron injection and charge recombination as these two are major factors in dictating solar cell performance. In addition, elucidating the relationship between these two critical processes and solar cell performance in each oxide is critical in building up the basic foundation of SSSCs. In this study, ultrafast pump-probe laser spectroscopy and open-circuit decay analysis were conducted to examine the characteristics of three representative oxides ($TiO_2$, ZnO, and $SnO_2$) in terms of electron injection kinetics and charge recombination, and the implication of results is discussed.

  • https://doi.org/10.5012/bkcs.2012.33.12.4063 인용 PDF KSCI

전기화학형 발광소자의 제작에 관한 연구 (The study of electrochemi-luminescence device fabrication)

  • 권혁문;곽동주;성열문;송재은
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.1326_1327
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    • 2009

  • In this study, used simplest sandwich cells containing $Ru2^+$ liquid electrolytes in order to clarify the role of nanoporous $TiO_2$ electrodes. And, the cell structure is as follow: F:$SnO_2$ glass/nanoporous $TiO_2$/ tris(2,2'-bipyridy)ruthenium(II) colplex [$Ru(bpy)_3(PF_6)_2$] in acetonitrile/ F:$SnO_2$ glass. The result, we found that ECL intensities increased rapidly by use of cathodes with nanoporous $TiO_2$ layers. And, porous $TiO_2$ electrodes were confirmed to be efficient for ECL devices as well as solar cell devices. It is thought that the increases in the ECL intensities may be associated with both formation of $Ru^+$ in porous $TiO_2$ electrodes and the process taking place after reduction of $Ru^+$ which occurs in the nanoporous electrodes.

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MnO$_2$가 첨가된 Pb(Sn$_{1}$2/Nb$_{1}$2/)O$_3$-PbTiO$_3$-PbZrO$_3$ 세라믹의 유전 및 초전특성에 관한 연구 (A Study on the Dielectric and Pyroelectric Properties of the Pb(Sn$_{1}$2/Nb$_{1}$2/)O$_3$-PbTiO$_3$-PbZrO$_3$ Ceramics doped with MnO$_2$)

  • 함영욱;이능헌;이덕출
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1993년도 추계학술대회 논문집
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    • pp.10-13
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    • 1993

  • ln this study, x PSN - y PT - z PZ ceramics doped with w MnO$_2$were fabricated by the mixed oxide method at 1250[$^{\circ}C$] for 2[hr] and then the dielectric and pyroelectric properties were investigated. In the 0.05 PSN - 0.4 PT - 0.55 PZ specimen with 0.5[wt.%] MnO$_2$, the pyroelectric coefficient was 6.6${\times}$10$\^$-8/[C/cm$^2$$.$$^{\circ}C$], respectibly.

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$(Zr_{0.65}, Sn_{0.35})Ti_{1.04}O_{4.04}$세라믹스의 NiO첨가에 따른 고주파 유전 특성 (Microwave dielectric properties according to the additions of NiO to $(Zr_{0.65}, Sn_{0.35})Ti_{1.04}O_{4.04}$ ceramics)

  • 윤중락;권정열;이헌용;김경용
    • E2M - 전기 전자와 첨단 소재
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    • 제8권5호
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    • pp.594-600
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    • 1995

  • Dielectric properties at microwave frequencies of ($Zr_{0.65}$, $Sn_{0.35}$) $Ti_{1.04}$ $O_{4.04}$ ceramics with additives, NiO as an agent to improve dielectric properties and $B_{2}$ $O_{3}$ as a firing agent were investigated. When 0.5 - 1.5 wt% of NiO is add, the grain growth is inhibited and the shape of the grain is uniformed, Dielectric constant(Fr) and bulk density are increased with raising amount of NiO at sintering temperature of 1330 - 1360.deg. C, but the temperature coefficient of resonant frquency(.epsilon.$_{r}$) decreased gradually as the NiO content increased. The value of Qx $f_{o}$ was increased as the amount of NiO was increased in the range of 0.5 to 1.0 wt% and the Qx $f_{o}$, was decreased slightly with raising sintering temperature. With NiO of 1.0 wt% and at sintering temperature of 1360.deg. C, this ceramics was found to have excellent microwave properties of .epsilon.$_{r}$=37.8, Qx $f_{o}$ = 48.600 and .tau.$_{f}$ = 7 ppm/.deg. C.C.. C.. C.C.. C.. C.

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