Magnetized curie point

This decay rate is nearly equivalent to that exhibited by one g of radium in equilibrium with its disintegration products. A miUicurie (mCi) is 0.001 curie, curie point See magnetized curie point, curing See autoclave nitrogen atmosphere cure extruder wire and cable process, dry cure inhibitor prepreg volatile content reinforced plastic resin transfer molding test, Barcol hardness test, scorch Mooney thermoset plastic vulcanization welding, induction. 

The primary shutdown system is backed up by an ultimate shutdown system (USS). These control rods use magnetic latches, which can be actuated by either the reactor protection system (RPS) or automatically when the latch temperature exceeds the magnetic curie point temperature of the latch. 

None of the problems with asymptopia is new since they occur also in thermal phase transitions like the liquid-gas critical point or the magnetic Curie point mentioned above. 

If a paramagnetic salt is cooled, eventually a temperature is reached where the magnetic moments of the electrons line up. This temperature is known as the Curie point or the Neel point, depending upon whether the spins line up parallel below this temperature as in (b), with the moments pointing in the same direction to reinforce one another and produce ferromagnetism, or the moments line up in opposite directions as in (c) so that they cancel and antiferromagnetism occurs. 

Compound Band gap (eV) Ref. Magnetic susceptibility ref Curie point (°C) Ref... 

A vast amount of data based on dielectric constant measurements of substances in dilute solution in nonpolar solvents indicate that the theory is correct, but it looses validity and breaks down completely in the case of strongly polar media. It is interesting to notice that such a breakdown can be shown by the concept of the Curie point, introduced in connection with studies of magnetism but directly applicable to the case of dielectric constants. The dielectric constant can be related to the molar polarizability P and the molar concentration c by q. (21) and the value of P itself is given by Eq. (22). It is obvious that P increases as T dimin-... 

Figure 1. Magnetic effect in the Curie point of the -Fe3C carbide.

Cobalt has the highest Curie point of any metal or alloy of cobalt. The Curie point is the temperature at which an element will lose its magnetism before it reaches its melting point. 

Cobalt s Curie point is 1,121°C, and its melting point is 1,495°C. About 25% of all cobalt mined in the world is used as an alloy with other metals. The most important is the alloy alnico, which consists of nickel, aluminum, and cobalt. Alnico is used to make powerful permanent magnets with many uses, such as CT, PET, and MRl medical instruments. It is also used for electroplating metals to give a fine surface that resists oxidation. 

Pure iron is a fairly soft silver/white ductile and malleable moderately dense (7.87 gcm ) metal melting at 1,535 °C. It exists in three allotropic forms body-centered cubic (alpha), face-centered cubic (gamma), and a high temperature body-centered cubic (delta). The average value for the lattice constant at 20 °C is 2.86638(19)A. The physical properties of iron markedly depend on the presence of low levels of carbon or silicon. The magnetic properties are sensitive to the presence of low levels of these elements, and at room temperature pure iron is ferromagnetic, but above the Curie point (768 °C), it is paramagnetic. 

Molten iron Density 7.00 g/cm at 1,564°C vapor pressure 0.06 torr at 1,600° C, and 1 torr at 1,850°C, respectively viscosity 4.45 centipoise at 1,743°C surface tension 1,835-1,965 dynes/cm electrical resistivity 139 microhm-cm at the melting point. Magnetic properties attracted by magnets rapidly loses its magnetism ferromagnetic at ordinary temperature becomes paramagnetic when heated to its Curie point, 768°C. 

Th serve for storage of information because of their large storage density. The use of gadolinium metal as a heat puitp is a further magnetic application in v ch the Curie Point, v ch lies at room tenperature for this material, can be very well utilized. 

CURIE, PIERRE (1859-1906) CURIE, MARIE (1867-1934). Pierre Cume was bom and raised in Paris. With his brother. Jacques, he studied crystals and in 1880 discovered piezoelectricity. Piezoelectricity is the production of an electric charge by pressure on certain crystals. Pierre became director at the School of Industrial Physics and Chemistry in Paris where he worked for 22 years. His doctoral thesis on magnetism led lo his discovery, the Curie point, a temperature at which ferromagnetic substances lose their magnetism. 

CURIE POINT (or Curie Temperature). Ferromagnetic materials lose their permanent or spontaneous magnetization above a critical temperature (different for different substances). This critical temperature is called the Curie point. Similarly, ferroelectric materials lose their spontaneous polarization above a critical temperature. For some such materials, this lemperaLure is called the "upper Curie point." for there is also a "lower Curie point." below which the ferroelectric property disappears. See also Ferromagnetism. 

CURIE-WEISS LAW. The transition from ferromagnetic to paramagnetic properties, which occurs in iron and other ferromagnetic substances at the Curie point, is accompanied by a change in the relationship of Ihe magnetic susceptibility lo the temperature. P. Curie stated in 1895 that above this point the susceptibility varies inversely as the absolute temperature. But this was found in be not generally true, and was modified in 1907 by P. Weiss to stare that the susceptibility uf a paramagnetic substance above the Curie point varies inversely as the excess of the temperature above that point. At or below the Curie point, the Curie-Weiss law does not hold. 

Few of the many known ferromagnetic solids are suitable as catalysts for the nondissociative ortho-parahydrogen conversion. This is especially true if measurements are needed in the neighborhood of the magnetic phase transition, Tc. The reasons for this are threefold the solid may decompose at the temperature necessary to free the surface from contaminants, the Curie point may be so low that the experimental difficulties are formidable, and many such solids show strong dissociative conversion activity near Tc. Of the three solids named above none is very satisfactory. 

---