Linear coefficient of specific heat

UTX compounds with Caln2 structure. CAF denotes a canted antiferromagnet, AF an antiferromagnet, F a ferromagnet rC N the temperature of magnetic ordering p.s the spontaneous moment geff 6p, and Xo the CW parameters y the linear coefficient of specific heat. 

We next demonstrate these relations for the mixed-valent compound YbCuAl. As seen in fig. 8, this material has a susceptibility maximum near 25 K, with a linear coefficient of specific heat ) =0.26 J/molK (Mattens et al. 1980, Pott et al. 1981a). These numbers imply (Rajan 1983) a Kondo temperature in the range 60-100 K. The thermal-expansion anomaly is negative in Yb compounds because the trivalent state has a smaller volume than the divalent state that is increasingly favored at low temperature due to the hybridization. In the inset of fig. 25 we show the volume expansion... 

Figure 3. Generalized thermodynamic quantities calculated for a Lennard-Jones KrAr binary mixture (left) and molten LiF alloy (right) the generalized dilatation 6(k) the generalized linear thermal expansion coefficient ckt (fc) the generalized specific heat at constant volume Cy (fc) (the filled boxes at k = 0 correspond to the values obtained directly in MD simulations) and the generalized ratio of specific heats 7(k).

Properties Linear coefficient of expansion 32 x 107 in/C, elasticity coefficient 6.230 kg/sq mm, hardness (scleroscope) 120, d 2.25, specific heat 0.20, refr index 1.474 dispersion 0.00738, light and heat transmission higher than the best plate glass, dielectric constant 4.5 (25C), upper working tem-... 

Thermal expansion is the change in specific volume of a material as it is heated. The linear coefficient of thermal expansion (a with units of inverse temperature) can be expressed as the change in length of an object, normalized by its original length, for a given temperature change (3) ... 

Structural and magnetic characteristics of U6X, Np6X and Pu6X compounds. X4K s the low-temperature magnetic susceptibility y the linear coefficient of the low-temperature specific heat per mole An atom, taken above the superconducting transition T0 the temperature of the... 

Fig. 4.12. Concentration dependence of y, the linear coefficient of the specific heat, in UNiAl, xGax...

Table 10-1. Density p, Specific Heat Capacity at Constant Pressure Cp, Linear Coefficient of Expansion and Thermal Conductivity k of Polymers, Metals, and Glass at 25 C...

The most outstanding YbZX compounds are ferromagnetic YbNiSn, intermediate-valent YbCuAl, and the bismuthide YbPtBi with an extremely large linear coefficient of the specific heat y=8 J/molK. More than 85 publications have been devoted to these three peculiar materials in recent years. 

The coefficient of linear thermal expansion, specific heat, thermal diffusivity, thermal conductivity for 1-D and 2-D SiC/RBSN at four temperatures in nitrogen measured parallel and perpendicular to the fibers are summarizedin Tables III and IV. In general, through-the thickness thermal conductivity value at room temperature for SiC/RBSN composites is low when compared with a value 7 W/m-k for the unreinforced RBSN or with a value of 30 W/m-k for the sintered silicon nitrides [13]. Both weak bonding between the SiC... 

Qualitatively, the pressure dependence of A is consistent with that of Sommerfeld coefficient y of specific heat. As shown in Figures 101 and 102, y increases from 20 mj/mol at ambient pressure and passes through a broad maximum of 80 mJ/mol near 1.0 GPa. In the general case, the coefficient A of term in the resistivity and the linear specific heat coefficient y appear to have the relation A [Pg.101]

Deflection temperature under load (1.8 MPa) Coefficient of linear expansion (-30°C to +30°C Specific heat 20-300°C >300°C... 

These techniques help in providing the following information specific heat, enthalpy changes, heat of transformation, crystallinity, melting behavior, evaporation, sublimation, glass transition, thermal decomposition, depolymerization, thermal stability, content analysis, chemical reactions/polymerization linear expansion, coefficient, and Young s modulus, etc. 

Metal A lomic number Atomic weight Lattice structure Density at 20°C (g/em ) Melting point (°C) Thermal conductivity at 0-l00°C (W/m°C) Specific heat at 0°C (J/kg C) Coefficient of linear expansion at 20-iOO°C X 70 Thermal neutron cross-section (barns) (10-- m ) Resistivity at 0°C (fiil em) Temperature coefficient of resistance o-ioo°c X 10 ... 

The band electronic structure of kl-(BEDT-TTF)2Cu(CF3)4(TCE) was calculated through the use of Hiickel tight binding computations [39] and the infrared properties analyzed [40]. These calculations indicate that the electronic band structure [10, 41] and infrared response [42] is similar to that found in the k-(BEDT-TTF)2Cu(dca)X (X = Cl and Br) salts. Specific heat measurements of kl-(BEDT-TTF)2Ag(CF3)4(TCE) indicate a linear coefficient (y = 50 mJ mol 1 K2), which is a factor of nine greater than expected from a free-electron picture [43],... 

For the forced convective region, only limited data are available on the effects of the different variables involved, since the existence of this region has only been recognized recently. As previously mentioned, the velocity required for the suppression of nucleate boiling increases with pressure further, an increase in pressure reduced the specific volume of the vapour and hence the linear velocity of the two phase mixture at a given quality will be reduced. Thus higher velocities and steam qualities would be required for the forced convective region to be entered at the same heat flux. The effect of diameter is, as far as can be seen from the work of previous experiments and from these experiments, that to be expected with convective heat transfer, namely, that the coefficient is proportional to the diameter or the equivalent diameter to the power —02. 

Specific heat at 25°C Latent heat of fusion Latent heat of vaporization Coefficient of linear expansion at 25°C Thermal conductivity at 25°C... 

We now give a simple application of the present method to Plutonium which is a good test case. Pu lies between light actinides with itinerant 5/ electrons and heavy actinides with localized 5/ electrons. The competition between these two electronic regimes in Pu is responsible for a lot of unusual properties as large values of the linear term in the specific heat coefficient and of the electrical resistivity or a very complex phase diagram. 

The coefficient of linear expansion of unfilled polymers is approximately 10 X 10 5 cm/cm K. These values are reduced by the presence of fillers or reinforcements. The thermal conductivity of the polymers is about 5 X 10 4 cal/sec cm K. These values are increased by the incorporation of metal flake fillers. The specific heat is about 0.4 cal/g K, and these values are slightly lower for crystalline polymers than for amorphous polymers. 

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