Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/97933
標題: 在垂直式溶液布里居曼長晶中溫度梯度與n型Ba8Ga16Sn30熱電晶籠化合物的晶粒尺寸之關係
The relationship between the temperature gradient and grain size of the n-type Ba8Ga16Sn30 thermoelectric clathrates in vertical solution Bridgman growth
作者: 胡玹雋
Hsuan-Chun Hu
關鍵字: 熱電材料;Ba8Ga16Sn30晶籠化合物;垂直式布里居曼長晶法;溫度梯度;晶粒尺寸;潤覆相;thermoelectric material;Ba8Ga16Sn30 clathrates;vertical solution Bridgman method;temperature gradient;grain size;wetting phase
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摘要: 
本研究利用垂直式溶液布里居曼長晶法,以Ba:Ga:Sn=8:16:50之溶液,製備n型第八型態之Ba8Ga16Sn30晶籠化合物。藉由不同爐溫下,探討長晶過程之爐溫分布和溫度梯度對晶粒尺寸的影響。利用XRD與EDX對樣本進行晶體結構與成分分析,結果顯示樣本為第八型態之Ba8Ga16Sn30晶籠化合物。
五組爐溫參數設定範圍介於550°C到700°C間。當爐溫設定在600°C時,有最小的溫度梯度-6.5°C/cm,樣本有最大平均晶粒尺寸4.4 mm。隨著溫度增加,晶粒尺寸縮小。除此之外,為了提升晶粒尺寸嘗試改變原料總克數和爐體配置,然而晶粒沒有明顯的增大。
在本實驗中量測並討論Ba8Ga16Sn30樣本,在環境溫度40°C下,Seebeck係數、電導率與潤覆相比例之關係。並計算功率因子,結果顯示儘管潤覆相比例只有1.7%,功率因子亦會大幅降低。

In this study, the n-type type-VIII Ba8Ga16Sn30 clathrates were synthesized by the vertical solution Bridgman method from the solution with the atomic ration of Ba8Ga16Sn50. The relationship between the temperature gradient and grain size were investigated. The crystal structure and composition of Ba8Ga16Sn30 samples were determined by XRD and EDX. The results showed that the samples were the type-VIII Ba8Ga16Sn30 clathrates.
Five furnace temperatures were set between 550℃ and 700℃. When the furnace temperature is 600℃, and the temperature gradient of -0.65℃/cm is the lowest, the sample has the largest average grain size of 4.4 mm. And the grain size decreases as the temperature gradient increasing. In addition, in order to improve the grain size, the amount of raw materials and the furnace configuration were also changed. However, the grain size did not change significantly.
The thermoelectric properties including the Seebeck coefficient, electrical conductivity of the Ba8Ga16Sn30 of 40℃ were determined and discussed in dependence of the volume fraction of wetting phase. The results showed that the power factor greatly reduces even when the sample possesses the volume fraction 1.3% of wetting phase.
URI: http://hdl.handle.net/11455/97933
Rights: 同意授權瀏覽/列印電子全文服務,2021-08-14起公開。
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