Magnetic properties chromium

Chromium—Cobalt—Iron Alloys. In 1971, a family of ductile Cr—Co—Fe permanent-magnet alloys was developed (79). The Cr—Co—Fe alloys are analogous to the Alnicos in metallurgical stmcture and in permanent magnetic properties, but are cold formable at room temperature. Equivalent magnetic properties also can be attained with substantially less Co, thereby offering savings in materials cost. 

Chromium, tetraaquadichloro-chloride dihydrate hydrate isomerism, 1, 183 Chromium, tetrabromo-solvated, 3, 758 synthesis, 3, 763 Chromium, tetrachloro-antiferromagnetic, 3, 761 ferromagnetic magnetic properties, 3,7559 optical properties, 3,759 structure, 3,759 solvated, 3. 758 synthesis. 3, 759 Chromium, tetrachlorooxy-tetraphenylarsenate stereochemistry, 1,44 Chromium, tetrahalo-, 3,889 Chromium, tetrakis(dioxygen)-stereochemistry, 1,94 Chromium, triamminediperoxy-structure. 1, 78 Chromium, tricyanodiperoxy-structure, 1, 78 Chromium, trifluoro-electronic spectra, 3, 757 magnetic properties, 3, 757 structures, 3, 757 synthesis, 3, 756 Chromium, trihalo-clcctronic spectra, 3, 764 magnetic properties, 3, 764 structure, 3, 764 synthesis, 3, 764 Chromium, tris(acetylacetone)-structure. 1, 65 Chromium, tris(bipyridyl)-... 

Silver-colored, ductile metal that is attacked slowly by air and water. The element exhibits interesting magnetic properties. Found in television tubes. Laser material such as YAG (yttrium-aluminum garnet) doped with holmium (as well as chromium and thulium) can be applied in medicine, especially in sensitive eye operations. 

The magnetic properties of dibenzene chromium have also been discussed by the Russian workers (94). 

The electronic301 and magnetic properties of mononuclear chromium(III) complexes are quite well understood however there is a distinct tendency for octahedral symmetry to be invoked in cases where the true symmetry is much lower. Chromium(III) is a hard Lewis acid and many stable complexes are formed with oxygen donors. In particular hydroxide complexes are readily formed in aqueous solution, and this may be a problem in synthesis. Substitution at chromium(III) centres is slow302,303 and may well have some associative character in many cases. The kinetic inertness of chromium(III) has led to the resolution of many optically active complexes this work has been extensively reviewed.304... 

Only a very few polynuclear complexes containing more than two chromium(III) centers have been studied so far. However, magnetochemical and inelastic neutron scattering studies, heat capacity measurements, and emission spectroscopy have been reported for various tetranuclear species (40,142 151). Two review articles dealing with the spectroscopic and magnetic properties of chromium(III) oligomers have recently appeared (127, 128). 

The chromium(II) cation [Cr(terpy)2] is conveniently prepared by the interaction of aqueous chromium(II) solutions with excess terpy, and may be isolated as its perchlorate or iodide salt 239,255,299). The magnetic properties of [Cr(terpy)2][C104]2 have been recorded over the temperature range 20-300 K the complex is low spin its exhibits a nearly linear temperature dependence over this range 299). The complex may be reduced electrochemically (255) or chemically 239). Herzog and Aul have isolated the various [Cr(terpy)2]" complexes that may be obtained by chemical reduction [Cr(terpy)2]l2 (red-brown, = 2.80 BM), [Cr(terpy)2]I (wine-red, = 1.85 BM), and [Cr(terpy)2] (green, /r ff = 0.63 BM) 239). 

The chromium sulfide system is very complex, with two forms of Cr2S3 and several intermediate phases between these and CrS. Rhombohedral Cr2S3 has complex electrical and magnetic properties. The mixed-valent telluride Cr3Te4 is ferromagnetic. 

Electrolytically deposited chromium occludes 250 times its own volume of hydrogen. At ordinary temperatures chromium docs not exhibit magnetic properties, but does so at —15° C. to —20° C. The electrical conductivity of powdered chromium is approximately 38-5 mhos per cm. cube. ... 

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