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研究生:賈碩頎
研究生(外文):Jia, Shy-Chyi
論文名稱:鈮酸鋰攙雜氧化鋅之晶體結構與拉曼光譜分析
論文名稱(外文):The Raman Modes and Crystal Structure of ZnO doped in Lithium
指導教授:周雄;謝雲生
指導教授(外文):H Chou;W.S. Tse
學位類別:碩士
校院名稱:國立中山大學
系所名稱:物理研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:1996
畢業學年度:84
語文別:中文
論文頁數:43
中文關鍵詞:拉曼光譜晶體結構鈮酸鋰氧化鋅
外文關鍵詞:Raman SpectrumCrystal StructureDTAX-rayZnOLiNbO3
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當氧化鎂攙雜入鈮酸鋰晶體,可降低光損傷值並增加二倍頻的轉換率.因為
鋅離子與鎂離子有相似的大小及相同的價電子數,因此我們非常有興趣去
探索當氧化鋅攙雜入鈮酸鋰晶體時是否仍有與氧化鎂攙雜入鈮酸鋰晶體的
相同現象.實驗過程中,我們將氧化鋅與鈮酸鋰粉末混合並加熱至1320C使
其熔化反應,以每分鐘1C的速率降溫.取得樣品後利用DTA,ICP-MS及X-ray
研究反應後粉末的成份與結構,在室溫下完成拉曼光譜實驗. DTA實驗發現
一明顯的居里溫度,混合後粉末的熔點隨著攙雜量的增加而下降.X-ray繞
射圖顯示隨著鋅的攙雜量增加,晶體仍維持相同的結構,然而其相對強度隨
鋅攙雜量增加而有強弱的變化,顯示鋅進入晶體內取代鋰離子並製造缺陷.
譜線115cm-1顯示鋅離子線性的進入鈮酸鋰晶體內,這結果與ICP-MS量測鋅
的含量是相同的.譜線157cm-1告訴我們鋰離子與NbO6間的力常數增加

The MgO doped LiNbO3 exhibits high efficiency of preventing
photo damage and the second harmonic generation.Because Zn ion
has similar ionic size and the valence to Mg ion,it is
interesting to find out how ZnO doped into LiNbO3 and its
behaves. In this study,we doped ZnO by melt the mixture at
1320C and cool at a slow rate of 1C/min.To identify the
formation,the composition and the structure of samples,DTA,ICP-
MS and X-ray diffraction were used.The Raman Scattering
Spectrums were taken at room temperature. DTA shown a strong
peak of the ferroelectric transition at the Cure's temperature(
~1150C).The melting temperature of the mixture were lower from
1250C to 1170C when dopent increases from 2% to 16%.The samples
by melting method indicates a high solubility of Zn in LiNbO3
up to 18at.%.The main peaks of X-ray diffraction patterns
remain the same position to the undoped LiNbO3 but the relative
intensities alter one to another.This indicates that the
lattices of LiNbO3 do not change with the doping of Zn but the
substitution between ions do occur.The 115cm-1 peak,that
represents the substitution of Li site by either Nb or Zn ion,
was nearly invisible for the pure LiNbO3 crystal,that indicates
a very little of Nb is sitting at the Li site.While the
percentage of dopent increases linearly which coincides with
the ICP-MS measurement ,that the concentration of Zn ion
increases monotonically with the doping.However,ICP-MS
indicates that the concentration of Li ion increases Sharply at
low doping region of 2% and drops back to a lower concentration
for a higher doping level(~18%) of ZnO.The concentration of Nb
follows the opposited tendency as Li does.This strongly
indicates that the doped Zn intended to substitute the Nb site
for 2% of dopent.When more and more Zn were doped,Zn and Nb
ions were begin to substitute the Li at the Li sites.Therefore,
theconcentration of Li droped while the 115cm-1 peak increases.

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