PHONON ENHANCEMENT OF THE ELECTRONIC SPECIFIC HEAT NEAR THE MARTENSITIC TRANSFORMATION IN Ti (Ni, Co) CUBIC B2 ALLOYS

Martensitic transformation behavior of a series of Ti-(50-x)Ni-xCo at% alloys (x = 4, 8, 12, 16, 20) has been examined by electrical resistivity, magnetic susceptibility and specific heat measurements, in order to know the phase stability of the B2-type structure. The 4Co and 8Co alloys exhibit a typical first order B2-R-B19' transformation. The 12Co alloy probably transforms to the R-phase, but its microstructure is composed of small domains with about 10 nm in diameter, being quite different from the microstructure of a typical R-phase formed by nucleation and growth. The 16Co and the 20Co alloys do not show any martensitic transformation but anomalies of the electrical resistivity and magnetic susceptibility being similar to those of the 12Co alloy appear in these alloys. The diffuse scattering of 1/3<110> is also observed in the 16Co alloy. The Debye temperature decreases and electronic specific heat coefficient increases with increasing Co content.

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MAGNETIC SUSCEPTIBILITY, ELECTRONIC SPECIFIC HEAT AND TRANSPORT PROPERTIES OF SOME INTERMETALLIC COMPOUNDS OF CERIUM

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19711406 ◽

1971 ◽

Vol 32 (C1) ◽

pp. C1-1136-C1-1138 ◽

Cited By ~ 5

Author(s):

J. R. COOPER ◽

C. RIZZUTO ◽

G. OLCESE

Keyword(s):

Magnetic Susceptibility ◽

Specific Heat ◽

Transport Properties ◽

Intermetallic Compounds ◽

Electronic Specific Heat

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PHONON SPECIFIC HEAT NEAR THE MARTENSITIC TRANSFORMATION IN A CUBIC CuZnAl ALLOY

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19786456 ◽

1978 ◽

Vol 39 (C6) ◽

pp. C6-1033-C6-1034 ◽

Cited By ~ 1

Author(s):

D. Abbe ◽

R. Caudron ◽

P. Costa

Keyword(s):

Martensitic Transformation ◽

Specific Heat

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Specific heat below 3 °K of a gold–zinc and a gold–indium alloy

Canadian Journal of Physics ◽

10.1139/p69-135 ◽

1969 ◽

Vol 47 (10) ◽

pp. 1077-1081 ◽

Cited By ~ 8

Author(s):

Douglas L. Martin

Keyword(s):

Specific Heat ◽

Face Centered Cubic ◽

Electronic Specific Heat ◽

Confidence Limits ◽

Electric Field Gradients ◽

Field Gradients ◽

Atomic Silver ◽

Face Centered ◽

Specific Heat Coefficient ◽

Limiting Value

Face-centered-cubic alloys of gold with 10 atomic % zinc (divalent) and 10 atomic % indium (trivalent), respectively, were measured in the range 0.4 to 3.0 °K. The coefficients of the nuclear specific-heat term were 1.80 ± 0.07 μcal °K/g atom for AuZn and 1.29 ± 0.06 μcal °K/g atom for AuIn (95% confidence limits). For a gold–10 atomic % silver (monovalent) alloy (Martin 1968) the nuclear term was 0.44 μcal °K/g atom. These results show that electric field gradients in alloys are not simply proportional to the valence difference of the components, a conclusion which may be drawn from NMR results. For the AuZn alloy the electronic specific-heat coefficient (γ) is 153.4 ± 0.7 μcal/°K2 g atom and the limiting value of the Debye temperature (θ0c) is 177.0 ± 0.5 °K. For the AuIn alloy γ is 185.9 ± 0.7 μcal/°K2 g atom and θ0c is 159.1 ± 0.3 °K.

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