Structural transitions in a TiNiFe shape memory alloy
Por:
Marquina M.L., Jiménez M., Marquina V., Aburto S., Ridaura R., Gómez R., Escudero R., Ríos-Jara D.
Publicada:
1 ene 1994
Resumen:
Results for resistance versus temperature, differential scanning calorimetry (DSC), Mössbauer spectroscopy, and magnetic susceptibility measurements in a Ti50Ni47Fe3 sample are presented. The resistance versus temperature curve shows a sharp increase at 245K and then rises slowly until a maximum is attained at ?150K. The DSC curve also exhibits a peak at the former temperature. The room temperature Mössbauer spectrum consists of a single line. As the temperature is lowered to 270K, a small asymmetric quadrupole doublet appears. The isomer shift and quadrupole splitting values of this doublet increase with decreasing temperature until almost constant values are achieved at temperatures ?100K. The magnetic susceptibility curve shows a sharp decrease that begins at 255K and then an unexpected increase at 90K. We relate these observations with a charge density wave-driven premartensitic transition in this system, and with the final martensitic phase. © 1994.
Filiaciones:
Marquina M.L.:
Facultad de Ciencias, UNAM. 04510, Mexico
Jiménez M.:
Facultad de Ciencias, UNAM. 04510, Mexico
Marquina V.:
Facultad de Ciencias, UNAM. 04510, Mexico
Aburto S.:
Facultad de Ciencias, UNAM. 04510, Mexico
Ridaura R.:
Facultad de Ciencias, UNAM. 04510, Mexico
Gómez R.:
Facultad de Ciencias, UNAM. 04510, Mexico
Escudero R.:
Instituto de Investigación en Materiales, UNAM. 04510, México D. F., Mexico
Ríos-Jara D.:
Instituto de Investigación en Materiales, UNAM. 04510, México D. F., Mexico
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