Magnetic susceptibility temperature coefficient

The ESR spectrum of the pyridazine radical anion, generated by the action of sodium or potassium, has been reported, and oxidation of 6-hydroxypyridazin-3(2//)-one with cerium(IV) sulfate in sulfuric acid results in an intense ESR spectrum (79TL2821). The self-diffusion coefficient and activation energy, the half-wave potential (-2.16 eV) magnetic susceptibility and room temperature fluorescence in-solution (Amax = 23 800cm life time 2.6 X 10 s) are reported. 

The magnetic susceptibility decreases as T from the lowest temperature T = 80 mK with a coefficient T" = 13 Above 10 K a modified Curie-WeiB law is followed. The specific heat is the only known case of a T ln(T/Tsf) behaviour with Tjf = 25 K and y =... 

The physical properties of solvents greatly influence the choice of solvent for a particular application. The solvent should be liquid under the temperature and pressure conditions at which it is employed. Its thermodynamic properties, such as the density and vapor pressure, temperature and pressure coefficients, as well as the heat capacity and surface tension, and transport properties, such as viscosity, diffusion coefficient, and thermal conductivity, also need to be considered. Electrical, optical, and magnetic properties, such as the dipole moment, dielectric constant, refractive index, magnetic susceptibility, and electrical conductance are relevant, too. Furthermore, molecular... 

NEEL TEMPERATURE. The transition temperature for an antiferromagnetic material. Maximal values of magnetic susceptibility, specific heat, and thermal expansion coefficient occur at the NEel temperature. 

The crystal structure of cadmium rhenium(V) oxide, as determined by single-crystal technique,1 is of the face-centered cubic pyrochlore type (a = 10.219 A.). The only positional parameter for the 48 (/) oxygens is x = 0.309 0.007 when rhenium is at the origin. The density, determined pycnometrically, is 8.82 0.03 g./cc., compared with the theoretical value of 8.83 g./cc. for Z = 8. The resistivity between 4.2 K and room temperature is very low (10-3-10-4 J2-cm.) and has a positive temperature coefficient. Over the same temperature range the magnetic susceptibility is low and temperature-independent. These properties indicate that cadmium rhenium(V) oxide exhibits metallic conductivity. 

While the model presented herein is crude and there is no certainty that the free energy is minimized with the choices of parameters, the model accounts well for the properties which depend most directly on the magnitude of the density of states, i.e., low-temperature electronic specific heat, magnetic susceptibility, enthalpy, and Hall coefficient changes observed through the TTR. Since the band-structure model is limited to the den-... 

ZT Y r A A A A A AC dimensionless thermoelectric figure of merit electronic coefficient of heat capacity (1+ZT)F2 crystal field singlet non-Kramers doublet (crystal field state) crystal field triplet crystal field triplet hybridization gap jump in heat capacity at Tc K KL -min P 6>d X JCO total thermal conductivity of solid thermal conductivity of electrons or holes thermal conductivity of lattice minimum lattice thermal conductivity electrical resistivity Debye temperature magnetic susceptibility magnetic susceptibility at T = 0... 

The magnetic susceptibility of water has frequently been determined, the value for K X10 at 20° C. being 0-7029 with a temperature coefficient... 

Table 1. Relationship between X and the physical solute properties using different FFF techniques [27,109] with R=gas constant, p=solvent density, ps=solute density, co2r=centrifugal acceleration, V0=volume of the fractionation channel, Vc=cross-flow rate, E=electrical field strength, dT/dx=temperature gradient, M=molecular mass, dH=hydrodynamic diameter, DT=thermal diffusion coefficient, pe=electrophoretic mobility, %M=molar magnetic susceptibility, Hm=intensity of magnetic field, AHm=gradient of the intensity of the magnetic field, Ap = total increment of the chemical potential across the channel...

Examinations of other physical properties of pyridazine include the ESR spectrum of pyridazine radical anion (obtained with pyridazine and sodium or potassium in dimethoxyethane or tetra-hydrofuran, the self-diffusion coefficient and activation energy, the half-wave potential (-2.16V), and magnetic susceptibility. Pyridazine was reported not to fluoresce and no luminiscence could be observed even under very long exposures. More recently, room-temperature fluorescence in solution is reported to be at 23,800 cm (max.), with a life time of 2.6 x 10 . ... 

Exchange constants for low-dimensional magnets are most commonly obtained via comparison of experimental data to the predicted behavior of a thermodynamic property for a given model, usually the magnetic susceptibility. Johnston et al. showed that the molar susceptibility xm of the uniform chain can be expressed as a ratio of polynomials in powers ofthe reduced temperature t t = hgT/ 2J ). The coefficients N and D are listed in Table 1. 

Table 1 Coefficients for the expansion of the molar magnetic susceptibility of the X = 1 /2 Heisenberg antiferromagnetic chain in equation (36). This expression is valid over the temperature range 0.01 < r/ 27 < 5...

Properties. — Thallium is a white metal with blue tint, and when freshly cut it has a brilliant metallic luster. It is so soft that it may easily be marked with the thumb nail and leaves a black streak on paper. It is malleable but has little tenacity, and when an attempt is made to cut it with a file or saw it stops up the teeth of the tool. It has a crystalline structure and emits a sound similar to the tin cry. It exists in two modifications, the transition temperature bang 226°. It melts at 303°, commences to volatilize at 174°, boils under atmospheric pressure at 1515°, and may be distilled in a stream of hydrogen. The coefficient of expansion is 0.000031 and the coefficient of compressibility is 2.33 X 10- per atmosphere. The latent heat of fusion is 7.2 calories per gram, the mean specific heat is about 0.03. The electrical conductivity1 in reciprocal ohms per cubic centimeter at 20° is 5.28 and the magnetic susceptibility is—29 X 10-6C,g.s. units per unit volume. In the electromotive series thallium comes between iron and cobalt. 

It is risky, of course, to generalize from one oxide to another, but in the absence of adequately completed studies with anyone of the oxides, the assumption concerning the density of carriers seems justified. All of the superconducting oxides display R(T)fs similar to those cited above. In the case of strontium titanate, SrTiOg.., Schooley et al. (15) have shown that the critical superconducting temperature determined from the midpoints of the abrupt decreases in the resistance vs temperature and the magnetic susceptibility vs temperature depend on the density of carriers determined from measurements of Hall coefficients. Thus the results of Tc vs density of carriers is shown in Figure 4. Therein, one observes that the Tc s from both R(T) and x(T) increase to maxima near 10 carriers cm 3 and thereafter they decrease. 

Figure 4. For SrTiO variation of superconducting temperature from half-height of resistance R and magnetic susceptibility x vs. carrier density determined from Hall coefficient. Data from Ref.

Basic characteristics of actinide metals. X300K s the magnetic susceptibility at T— 300 K jiet( and 6p the Curie-Weiss parameters Tc N the temperature of magnetic ordering y the linear coefficient of... 

When An is small (well below the Hill limit) and the corresponding 5f-5f overlap is large and/or when the 5f-ligand hybridization is strong, one expects that a relatively broad 5f band is formed, intersected by EF. A relatively low density of the 5f states at EF is reflected in a modest value of the specific heat coefficient y. The magnetic susceptibility x is practically temperature independent, but the values can be somewhat enhanced with respect to the specific heat data if the formula... 

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... 

---