| Summary: | 碩士 === 淡江大學 === 物理學系碩士班 === 104 === We have performed X-ray absorption near edge structure (XANES) to study the shape memory alloys Ti50-X Ni50+X (x=0，0.4，0.7，1.0，1.3，1.6). From Ti L2，3 -edge spectra, we find that L3 absorption intensity, at x≤1, decreases systematically. While, at higher Ni concentration (x>1), the L3 absorption intensity increases. The variation of Ti 3d unoccupied states correlates well with the electric resistivity and electronic thermal conductivity of austensit phase. From Ni L2，3 -edge spectra, we find that L3 absorption intensity, at x≤1 decreases systematically, The variation of Ni 3d unoccupied states correlates well with the electric resistivity of martensite phase. While, at higher Ni concentration (x>1), the L3 absorption intensity decreases. From Ti K–edge spectra, main absorption peak only at x=1.6 has strong intensity, other no obvious change. From Ni K–edge spectrum, no significant change in the spectral shape, speculate that no related with seekback effect.
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