頁籤選單縮合
| 題 名 | Structural Studies of the Destruction of Cu-O Chains in PrBa₂Cu₃O₇ by Ga-doping |
|---|---|
| 作 者 | Peng,J. C.; Hsieh,W. T.; Lee,K. C.; Li,W. H.; Yang,H. D.; | 書刊名 | Chinese Journal of Physics |
| 卷 期 | 36:2(Part1) 民87.04 |
| 頁 次 | 頁72-84 |
| 分類號 | 338.4 |
| 關鍵詞 | |
| 語 文 | 英文(English) |
| 英文摘要 | Structural changes of the PrBa₂Cu₃MO₇ compound as Cu are partially replaced by Ga or Zn are studied by using high resolution neutron diffraction measurements. Rietveld method is followed in refining the diffraction patterns. Ga atom is foundto enter the Cu site in the CuO-chain layers, that also causes the O in that layerto become disorder with equal probability to occupy the sites along the a and alongthe b axis directions. This effectively destroys the Cu-O chain ordering observed inthe undoped sys em, and results in (Cu/Ga)-O chain run in both the a and b axis directions. Tetragonal symmetry for the Ga-doped compound is resulted. Zn atom,on the other hand, replaces the Cu in the CuO₂)-plane layer, which make no significant effect on the basic structure except a small oxygen disorder in the chain layers. Thebond lengths of Pr and the O in the CuO₂-plane layers increase slightly in the Ga-doped system, whereas that in the Zn-doped system remains basically unaffected. |
本系統中英文摘要資訊取自各篇刊載內容。