鋁鈦合金無序程度與德拜溫度關係

Abstract

我用電弧爐製作了一系列無序系統的塊材Al100-xTix樣品，其x的範圍由0至5。在本研究中，對樣品進行電阻率量測，溫度量測範圍由10至500 K。結果顯示，樣品的室溫電阻率 由2.7 cm (純鋁)提升至4.7 cm (摻雜5%鈦的鋁鈦合金)。 再將實驗結果與Bloch-Gru ̈neisen和electron-phonon-impurity interference兩個模型擬合，獲得Debye溫度由425降至364 K。 此外，我們觀察到在高溫時，樣品之電阻率可由Bloch-Gru ̈neisen模型完整描述；在低溫時，electron-phonon-impurity interference所貢獻的電阻率，因無序程度的增加而增強。

We have prepared a series of disorder system sample which are Al100-xTix bulks with x varying from 0 to 5 by a standard arc-melting method. The resistivities of these bulks were measured from 10 to 500 K. The room temperature resistivities for our samples vary from 2.7 cm (pure) to 4.7 cm (5% doped). Comparing our measured results with Bloch-Grüneisen and electron-phonon-impurity interference theories, we have extracted Debye temperature from 425 down to 364 K. The measured resistances are well described by the Bloch-Grüneisen law between 100 and 500 K. In low temperature regime, leading to disordered, the electron-phonon-impurity interference effect contributes significantly to the measured resistivities.