研究生: |
邱世寬 Shih-Kuan Chiou |
---|---|
論文名稱: |
含銅化合物中CuKβ/Kα比值之量測 |
指導教授: |
張秋男
Chang, Chu-Nan |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
畢業學年度: | 81 |
語文別: | 中文 |
論文頁數: | 68 |
中文關鍵詞: | 釔鋇銅氧;比值;含銅化合物 、YBCO; Kβ/Kα intensity ratio; copper compounds |
論文種類: | 學術論文 |
相關次數: | 點閱:123 下載:0 |
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對化合物中銅的Kβ/Kα 比值的量測可以了解銅在形成化合物時Cu(3d)
─O (2p)軌域混成的情形。本研究係針對含銅化合物量測其ΔKβ/Kα
(以氧化亞銅為標準),已完成的量測有:含銅的簡單化合物─Cu2O,
Cu2S, CuO,CuS,CuF2和CuCl2。含銅的高溫超導體化合物─ 釔鋇銅氧
(YBCO)(包含具超導性和非超導性樣品);Y(Ba 1-xSrx)2Cu3Oy (
YBSCO)x,x=0.1~0.6。Y(Ba1-xSrx)2 Cu3-0.21xMo0.21xOy( YBSCMO)
x,x=0.1~1.0。從研究中發現,在具高溫超導特性的樣品中Cu(3d)和
O (2p)軌域有著較強烈的混成,使得O (2p)→Cu(1s)的跨越躍遷(
crossover transition)強度增加,所以具有較大的Kβ/Kα 比值。而在
含Sr和Mo的高溫超導樣品中,銅的 Kβ/Kα 比值會隨著參入(dope)量
的增加而降低,因此可以了解到Sr和Mo離子會對Cu(3d)和O (2p)鍵結
軌域輸入負面的影響。
The Cu Kβ/Kα intensity ratios have been measured for copper
compounds of Cu2O, CuO, Cu2S, CuS, CuF2 and CuCl2 and high-Tc
superconducting cuprates of Y(Ba1-xSrx)2Cu3-0.21xMo0.21xOy with
x=0 ~1. The large increase of Cu Kβ/Kα intensity ratio in
high -Tc superconductor relative to other copper compounds is
interpreted as the increase of transitions from Cu valence band
to Cu(1s) state, when Cu(3d) and O(2p) are highly hybridized.
The decrease of Cu Kβ/Kα intensity ratio with the increase of
x in the high-Tc superconducting cuprates indicates both the Sr
and Mo ions have negative input to the degree of hybridization
of Cu(3d) and O(2p) bands.
The Cu Kβ
Kα intensity ratios have been measured for copper