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Low Temperature Specific Heat and Magnetic Susceptibility of NbTi and NbTiMn Alloys
Abstract We report on the results of a low temperature specific heat and magnetic susceptibility studies of a series of annealed-and-quenched binary NbTi alloys in the concentration range 41~53 wt.% Nb, which includes most compositions of technical interest. Also discussed is the influence of Mn on the calorimetrically measured properties of NbTi. Three series of alloys are considered: (i) a set of binary control alloys; (ii) alloys with Mn content fixed at ~0.5 wt.% and with Nb concentration between about 41 and 53 wt.%; (ii) alloys with an almost fixed Ti content (~46 wt.%) and with Mn concentration between 0 and ~5 wt.%. In alloys such as Ti-52Nb it is demonstrated that the addition of several percent of Mn causes a decrease in the electronic specific heat coefficient and a concomitant decrease in Tc. In that regard the effect of Mn on Tc (dTc/dc = -0.22 K/at.%) is comparable to that of Cr, Mo, or Re (for which dTc/dc = -0.2 K/at.%). It is concluded: (i) that Mn is a strong stabilizer of the bcc phase in Ti-base alloys; (ii) that Mn in bcc NbTi acts like any other nonmagnetic transition-element and influences Tc through its influence on the band density of states.
Low Temperature Specific Heat and Magnetic Susceptibility of NbTi and NbTiMn Alloys
Abstract We report on the results of a low temperature specific heat and magnetic susceptibility studies of a series of annealed-and-quenched binary NbTi alloys in the concentration range 41~53 wt.% Nb, which includes most compositions of technical interest. Also discussed is the influence of Mn on the calorimetrically measured properties of NbTi. Three series of alloys are considered: (i) a set of binary control alloys; (ii) alloys with Mn content fixed at ~0.5 wt.% and with Nb concentration between about 41 and 53 wt.%; (ii) alloys with an almost fixed Ti content (~46 wt.%) and with Mn concentration between 0 and ~5 wt.%. In alloys such as Ti-52Nb it is demonstrated that the addition of several percent of Mn causes a decrease in the electronic specific heat coefficient and a concomitant decrease in Tc. In that regard the effect of Mn on Tc (dTc/dc = -0.22 K/at.%) is comparable to that of Cr, Mo, or Re (for which dTc/dc = -0.2 K/at.%). It is concluded: (i) that Mn is a strong stabilizer of the bcc phase in Ti-base alloys; (ii) that Mn in bcc NbTi acts like any other nonmagnetic transition-element and influences Tc through its influence on the band density of states.
Low Temperature Specific Heat and Magnetic Susceptibility of NbTi and NbTiMn Alloys
Collings, E. W. (author) / Smith, R. D. (author) / Ho, J. C. (author) / Wu, C. Y. (author)
1990-01-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
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