高イオン導電体におけるフォノン-可動イオン結合とイオン伝導度
高离子导体中的声子移动离子键和离子电导率
基本信息
- 批准号:07239246
- 负责人:
- 金额:$ 0.9万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research on Priority Areas
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
研究目的:高イオン伝導の原因が特徴的電子状態にあると予想し、可視光照射により電子を仮想状態に励起し可動イオン-フォノン結合を通してより高イオン伝導度出現の可能性を赤イオン伝導より探る。方法:高イオン導電体に対しエキシトンエネルギー以下の可視光(AgClでは4215A,AgBrでは5145A)を断続的に照射し,室温度,分解能1cm^<-1>で照射前後の遠赤外スペクトルを観測し,誘電率ε(ω)とイオン伝導度σの間の関係σ=ω[ε(ω)-ε(∞)]/4πiにより可動イオン及び光学フォノンの情報を得た。解析は分散式を用いたfittingの方法で行い,可動イオン密度Nや遠赤外領域のσを求める。結果:AgClとAgBrとで異なる以下の結果を得た。AgCl: 低エネルギー側の反射率Rが照射時間と共に段階的に上昇する。従って照射により可動欠陥数Nやσが増加する事になる。この予想をはっきりさせる為,10分以上の光照射で観測された横(ω_<TO>)及び縦光学フォノン振動数(ω_<LO>)の増加と減少とを,有効電荷の減少から点電荷モデルで解釈し,実験事実と適合する結果を得た。又,照射無しの試料の温度650K付近のRは可動イオンの項無しで記述できるが,室温度での14分間照射の試料の低エネルギー側のRはフォノンの項のみでは記述できない。この事は光照射の効果が欠陥誘起の点では温度上昇効果より強い事を示す。これらの結果はいずれも可動欠陥の増加を示唆る。AgBr: 5分間の連続照射の試料Bにははっきりと変化が現れたが断続照射の試料では10分以上の照射合計時間で変化が現れ、15分間照射の試料との間で段階的変化を示した。この時、Nは僅に増加するがイオン移動度μとσが減少する。ω_<TO>, ω_<LO>にはほとんど変化が無い。温度上昇の場合350K以上でNは僅かに減少し,σは緩い上昇を示すので,光照射による変化は温度上昇の時とは異なる傾向を示す事になる。光照射無しのAgBrの室温度でのRは可動イオンの項無しでは記述できないので,光照射は既に存在する欠陥を安全位置へ戻すannealingの役目も果たす事を示している。
Objective: To explore the cause of high conductivity and the possibility of high conductivity appearing in electronic state, visible light irradiation, electronic state, excitation and mobility. Methods: The relationship between the inductance ε (ω) and the conductivity σ = ω [ε (ω)-ε (∞)]/4 π i between the movable and optical information was obtained under the condition of high temperature conductivity and visible light (AgCl = 4215 A, AgBr = 5145 A).<-1>The method of solving the dispersion formula is to use the middle fitting method to solve the problem of the movable density N and the far red outer field σ. Results: AgCl and AgBr were different. AgCl: Reflectivity R on the low side increases with irradiation time and step. The number of movable parts N and σ increase in the radiation. This is expected to result in an increase or decrease in the number of transverse (ω_) and transverse (ω_) vibrations measured by more than 10 minutes of light irradiation, a decrease in point charge, and a decrease in point charge.<TO><LO>In addition, the irradiation temperature of the sample is close to 650 K, the temperature of the chamber is close to 14 minutes, the temperature of the sample is close to 650 K, the temperature of the chamber is close to 650 K, and the temperature of the chamber is close to 14 minutes. This is not only the point where the effect of light irradiation is not induced, but also the point where the effect of temperature increase is strong. The result of this is that the mobile phone can be used to increase the number of calls. AgBr: 5 minutes of continuous irradiation of sample B, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of 15 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of more than 15 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of more than 15 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time of sample with continuous irradiation of more than 15 minutes, the total irradiation time of sample with continuous irradiation of more than 10 minutes, the total irradiation time. The time, N, increase, and the mobility, μ, σ, decrease.ω_, ω_<TO><LO>When the temperature rises above 350 K, N decreases only, σ increases slowly, and light irradiation changes the temperature rise time. Light irradiation does not affect the temperature of the AgBr chamber, but it does not affect the safety position of the AgBr chamber.
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
K. Wakamura, M. Sugioka K. Kawakami, M. Kurita: "Photo enhanced narrowing of TO-LO splitting and ionic conduction in AgCl." Physica B. (in press). (1996)
K. Wakamura、M. Sugioka K. Kawakami、M. Kurita:“光增强 AgCl 中 TO-LO 分裂和离子传导的缩小。”
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若村 国夫其他文献
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{{ truncateString('若村 国夫', 18)}}的其他基金
ペロブスカイト型磁性体におけるホノンーマグノン相互作用の研究
钙钛矿磁性材料中声子-磁振子相互作用的研究
- 批准号:
X00210----274093 - 财政年份:1977
- 资助金额:
$ 0.9万 - 项目类别:
Grant-in-Aid for Encouragement of Young Scientists (A)