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University of Nebraska - Lincoln

Si-Hwang Liou Publications

1985

Articles 1 - 3 of 3

Full-Text Articles in Physics

Crystalline And Amorphous Feti And Fe2Ti, C.L. Chien, Sy_Hwang Liou Jun 1985

Crystalline And Amorphous Feti And Fe2Ti, C.L. Chien, Sy_Hwang Liou

Si-Hwang Liou Publications

Amorphous FeTi, Fe2Ti, and their crystalline counterparts are compared by measurements of x-ray diffraction, conductivity, and 57Fe Mössbauer spectroscopy. In FeTi one has the unique opportunity to compare a cubic crystal with its amorphous analog. X-ray diffraction and hyperfine interactions indicate no clear correlation between the crystalline and the amorphous states. The electrical conductivity exhibits distinctive behavior for the two states.


Rapidly Quenched FeXTa100-X Alloys, C.L. Chien, Sy_Hwang Liou, B.K. Ha, K.M. Unruh Apr 1985

Rapidly Quenched FeXTa100-X Alloys, C.L. Chien, Sy_Hwang Liou, B.K. Ha, K.M. Unruh

Si-Hwang Liou Publications

Binary alloys of FexTa100-x were made by high-rate sputtering. A sharply defined boundary separates the composition ranges in which crystalline alloys (93 ≤ x ≤100) and amorphous alloys (15 ≤ x ≤ 90) are formed. The amorphous alloys with Fe concentrations up to the threshold of xc ≈ 65 are nonmagnetic. For the samples with x > xc, the magnetic ordering temperature (Tc) varies monotonically with Fe content to 200 K for a-Fe90Ta10. However, the crystalline alloys, with slightly higher Fe content, are strongly ferromagnetic. Their Tc's are several hundred degrees higher, accompanied ...


Magnetic Properties And Hyperfine Interactions Of Amorphous Fe-Hf Alloys, Sy_Hwang Liou, G. Xiao, J.N. Taylor, C.L. Chien Apr 1985

Magnetic Properties And Hyperfine Interactions Of Amorphous Fe-Hf Alloys, Sy_Hwang Liou, G. Xiao, J.N. Taylor, C.L. Chien

Si-Hwang Liou Publications

Alloys of FexHf100-x (20 ≤ x ≤ 100) were fabricated by a vapor-quench method. The amorphous state, as verified by x-ray diffraction, is realized over a wide composition range of 20 ≤ x ≤ 94. The magnetic phase diagram was determined. The variation with Fe content of the magnetic ordering temperature (Tc) in Fe-Hf amorphous alloys shows a maximum at xp≈87. In contrast, the effective magnetic hyperfine field and therefore the Fe moment increases monotonically with x. Amorphous pure Fe is likely to be magnetic (Tc ~200 K) with a large magnetic moment. At higher Fe ...