Alloys paramagnetism

The work on iron-nickel alloys has described shock-compression measurements of the compressibility of fee 28.5-at. % Ni Fe that show a well defined, pressure-induced, second-order ferromagnetic to paramagnetic transition. From these measurements, a complete description is obtained of the thermodynamic variables that change at the transition. The results provide a more complete description of the thermodynamic effects of the change in the magnetic interactions with pressure than has been previously available. The work demonstrates how shock compression can be used as an explicit, quantitative tool for the study of pressure sensitive magnetic interactions. 

The disappearance of the paramagnetism of palladium-silver alloys (rich in Pd) when the ratio (H + Ag)/Pd = 0.6 (24) illustrates that the effect of both these alloying" elements in palladium is additive and each one contributes essentially in the same way to the change of magnetic susceptibility of palladium. 

Within the general trend in the behavior across the actinide series, their alloys, and their metallic compounds from superconductors to local moment magnets, the only serious irregularity occurs in some plutonium compounds. These compounds should be magnetic but turn out to be temperature independent paramagnets. 

The magnetic specific heats of some alloys containing paramagnetic atoms together with copper for comparison are shown in Fig. 3.8. Note that below 0.1 K, magnetic materials as manganin have a specific heat 103 higher than copper. 

Exchange broadening, see Electron paramagnetic response spectroscopy Exchange-coorelation effects, 34 213 Exchange reactions, 26 711-279, 31 106-107 on alloys, 26 294—296 carbon-14, from benzene- C to C - hydrocarbons, 23 127... 

Titanium metal is harder than steel but much lighter and does not corrode in seawater, which makes it an excellent alloy metal for use in most environmental conditions. It is also paramagnetic, which means that it is not responsive to magnetic fields. It is not a very good conductor of heat or electricity. 

Fig. 17. Activation energy for parahydrogen conversion on palladium-gold alloys. The broken line denotes the paramagnetic susceptibility in arbitrary units. [Couper, A., and Eley, D. D., Discusaions Faraday Soc. 8, 172 (1950).]...

A third electron is then transferred from the contact with the K—Na alloy, forming the paramagnetic radical trianion 67. The phosphorus coupling constant in 67 of dp = 4,6 was calculated from the ESR spectmm of 2.4.6-tris-pentadeutero-phenyl-X -phosphorin. 

Spontaneous magnetization of ferromagnets, therefore, decreases with increasing temperature and it disappears at temperatures above Tc. Above To ferromagnets become paramagnets and obey the Curie-Weiss law. Metals such as iron, cobalt, and nickel and their alloys, and y-Fe203 are examples of ferromagnetic materials. 

We emphasize that the use of g in these equations may be justified only if /—a, because of the Edwards cancellation theorem (Section 6). We should expect a metal-insulator transition to occur for some value of in the neighbourhood of For several liquid systems there is experimental evidence that the interference term in (52) is absent. Thus for liquid TeTl alloys, with variation of composition and temperature, for a less than the Ioffe-Regel value e2/3hai the conductivity is proportional to the square of the Pauli paramagnetic susceptibility and then to 2. These results are due to Cutler (1977). Warren (1970a, b, 1972a, b) examined... 

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