2013 Fiscal Year Final Research Report
Local fields and conduction electron behavior at impurity sites in ZnO
| Project/Area Number |
23600004
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Quantum beam science
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| Research Institution | Kanazawa University |
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Principal Investigator |
SATO Wataru 金沢大学, 物質化学系, 准教授 (90333319)
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| Co-Investigator(Kenkyū-buntansha) |
OHKUBO Yoshitaka 京都大学, 原子炉実験所, 教授 (70201374)
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| Co-Investigator(Renkei-kenkyūsha) |
YAMADA Yasuhiro 東京理科大学, 理学部, 教授 (20251407)
SATO Tetsuya 独立行政法人日本原子力研究開発機構, 先端基礎研究センター, 研究員 (40370382)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 酸化亜鉛 / 摂動角相関 / 不純物 / 局所構造 / インジウム / 伝導電子 |
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| Research Abstract |
Local structures in zinc oxide (ZnO) doped with In ions at various concentrations were investigated by means of the time-differential perturbed angular correlation (TDPAC) method with the 111Cd(<-111In) probe. Indium-concentration dependence of the TDPAC spectra suggests that the local structures formed by In ions are sensitive to their population in the system. The results obtained by spectral analyses are the followings: In ions can substitute for Zn ions without generating any defects in their vicinity when doped with a trace amount; they locally form microscopic unique structures widely dispersed in ZnO at the In concentration of 0.05 at.% or higher, evidently indicating the solubility limit of In ions in ZnO; and In2O3-like compounds are formed in samples with further concentrated In as high as 10 at.%. We also successfully observed conduction electron scattering at the probe nuclei composing the unique structure, which is consistent with conductivity observed for bulk samples.
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