研究生: |
劉貞鈴 Chen-Ling Liu |
---|---|
論文名稱: |
KTiOPO4:Al晶體輻射破壞的電子順磁共振研究 Electron paramagnetic resonance study of an Al-associated |
指導教授: |
余健治
Yu, Jiang-Tsu |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
畢業學年度: | 82 |
語文別: | 中文 |
論文頁數: | 37 |
中文關鍵詞: | 電子順磁共振;基曼效應;超微細分裂;捕捉電洞中心 |
英文關鍵詞: | Electron paramagnetic resonance(EPR) ; Zeeman effect ; |
論文種類: | 學術論文 |
相關次數: | 點閱:241 下載:0 |
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本實驗是利用電子順磁共振(Electron paramagnetic resonance)的方
法研究 Al-doped KTiOPO4 晶體於溫度300K 經 r─ray 照射後產生的點
缺陷(point defect)。溫度150K 時,我們可以看到一組六線超微細分
裂,可由一個鋁核說明,以及雙線超微細分裂,可由磷核解釋。結果顯
示 150K 時,g的主值是62.0027、2.0157和2.0464;鋁核的超6微細分裂
主值是6.3、7.4和7.5G;磷核的超微細分裂主值是0.6、2.5、和2.6G 。
根據分析,我們發現這個hole會在O(T)(titanyl oxygen)中的一個被捕獲
其附近並伴隨著位於Ti4+上(或其附近)的鋁雜質。室溫時,未滲入鋁雜
質的 KTiOPO4晶體中的oxygen hole center不穩定,加入鋁雜質有助於它
的穩定。
Electron paramagnetic resonance (EPR) has been used to study an
oxygen hole center(o-) produced in Al-doped KTiOPO4 crystals r-
irradiated at 300K. The EPR spectrum exhibited by this point
defectcan be observed at temperatures 300-100K. A six line
hype- rfine splittings ascribed to one 27Al nucleus and a
doublet spl- itting ascribed to one 31P nucleas has been
observed at 150K. At 150Kthe principal g values are
2.0027,2.0157,and 2.0464 ; the principal values of the 27Al
hyperfine splitting are 0.6, 2.5, and 2.6 G.The hole is trapped
at one of the titanyl oxygens and locally associated with an
Al3+ impurity located at or near a Ti4+ site. The Al impurity
stabilizes the oxygen hole center which would become unstable
at room temperature in undoped
Electron paramagnetic resonance (EPR) has been used to study an