Specific Heats of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Phase Cu-Al and Dilute Magnetic Cu-Al (Fe) Alloys

Zrudsky, Donald R.; Delinger, W. G.; Savage, William R.; Schweitzer, J. W.

doi:10.1103/physrevb.3.3025

Cited by 27 publications

(4 citation statements)

References 24 publications

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“…In figure 3 the results of the electronic specific heat measurements [l, [16][17][18][19][20][21] of Cu-Au alloys in disordered as well as ordered phases are shown. For disordered alloys the experimental electronic specific heat coefficient (yexp) lies on a smooth curve slightly below the linearly interpolated elemental metal values.…”

Section: Electronic Spec$c Heat Of Copper-gold Alloysmentioning

confidence: 99%

A band theoretical explanation for the electronic specific heat of some copper-gold alloys

Kokko

Ojala

Mansikka

1990

J. Phys.: Condens. Matter

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The low temperature electronic specific heat as a function of Au content in Cu-Au alloys shows interesting features. The specific heat coefficient of disordered alloys lies on a smooth curve below the linearly interpolated elemental metal values. Ordering reduces the value of this coefficient in all cases except that of the CuAu I alloy. It is shown that this behaviour of the electronic specific heat is due to the specific structure of the electronic density of states around the Fermi level. The position and shape of the large dip the authors found at the Fermi level varies with changes in the chemical composition or the crystal structure of the alloy. The singular property of the specific heat of CuAu I can be explained by the lattice contraction in the c direction. Besides these Fermi level properties, the electron density of occupied states, resolved into the total and Au part, is discussed for the case of Cu3Au I, CuAu I and CuAu3. Characteristic d-band energies (top, centre and bottom) are also presented. The calculations were performed using the linear-muffin-tin-orbital method.

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Section: Electronic Spec$c Heat Of Copper-gold Alloysmentioning

confidence: 99%

A band theoretical explanation for the electronic specific heat of some copper-gold alloys

Kokko

Ojala

Mansikka

1990

J. Phys.: Condens. Matter

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“…Alloying Cu with 10 at% A1 appeared to lower both the thermal expansion and the heat capacity below 15 K, but the magnitude of the decrease is comparable to the uncertainty in our measurements. The influence on the low-temperature heat capacity of alloying Cu with A1 has been investigated by Zrudsky et al (1971). From their measurements on a 10 at% A1 alloy only changes at temperatures below about 6 K have any significance and our data lack the precision for any meaningful comparison at these temperatures.…”

Section: Resultsmentioning

confidence: 90%

On the Cauchy-Riemann Conditions in the Class of Functions With Summable Modulus, and Some Boundary Properties of Analytic Functions

Sindalovskii¹

1987

Math. USSR Sb.

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Values for the magnetic Gruneisen parameter yM for CuMn, (Cu-10 at?; A1)Mn and AgMn alloys determined from low-temperature thermal expansion and specific heat capacity measurements are reported. yM is found to be both temperature-and concentration-dependent in contrast to the simple RKKY model for the spin-glass ordering. The concentration dependence of yM differs significantly from that reported earlier based upon a combination of thermal expansion and specific heat capacity measurements made independently on different samples. Dipolar anisotropy is discussed as a possible cause of the dependence of yM on temperature and magnetic impurity concentration.

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“…4 are calculated values of [6, 71 for the p-phase (squares), for the E-phase (triangles) and for the a-phase (full circles). As a matter of convenience of the analysis the results for the Cu-A1 alloys obtained earlier by us [5] and by other authors [8] are given in Table 3. The dependence of the *) Taken from [S].…”

Section: "mentioning

confidence: 99%

“…The concentration dependence of the electronic density of states at the Fermi level for Cu-A1 alloys after different treatments. (1) Deformed, (2) quenched from 650 "C, (3) quenched from 500°C, (4) annealed, (5) bulk samples quenched from 1000 "C [8] 41.5 and 3). The results shown by curve 5 of Fig.…”

Section: The Electronic Heat Capacity and The Electronic Density Of Smentioning

confidence: 99%

Short‐Range Order in Binary Solid Solutions The Change of Electronic Density of States on Ordering

Petrenko

Grabovskii

Кulish

et al. 1994

Physica Status Solidi (b)

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Concentration dependences of the electronic density of states near the Fermi level and the Cowley short-range order parameters are presented for the Ag-A1 solid solutions after varius thermomechanical treatments. The density of states is calculated from the data of the electronic heat capacity. The results obtained are analysed alongside with similar results for the Cu-Al solid solutions. It is shown that the electronic density of states decreases with ordering in the alloys. This decrease attains 40% for some alloys and treatments. The concentration dependences of the electronic density of states are non-monotonous. A minimum is observed in the range where the short-range order is essential. The explanation of these results is given in terms of the inhomogeneous order model. According to this model regions with different types of SRO are formed in a-solid solutions. In the ideal case the type of ordering in these regions corresponds to higher concentration phases, while the ordering in the r-solid solution corresponds to a superstructure of LI,-type. The order type of these regions is defined by the temperature and concentration of the alloy. The model explanations are confirmed by calculations based on formulas obtained with the experimentally measured short-range order parameters.

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Specific Heats ofα-Phase Cu-Al and Dilute Magnetic Cu-Al (Fe) Alloys

Cited by 27 publications

References 24 publications

A band theoretical explanation for the electronic specific heat of some copper-gold alloys

A band theoretical explanation for the electronic specific heat of some copper-gold alloys

On the Cauchy-Riemann Conditions in the Class of Functions With Summable Modulus, and Some Boundary Properties of Analytic Functions

Short‐Range Order in Binary Solid Solutions The Change of Electronic Density of States on Ordering

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