Carbides magnetic structure

Figure 4.17 EKasic silicon carbide laser-structured sliding bearings used for example, in highly loaded chemical pumps, in magnetic couplings for hermetically sealed pumps and in...

Many other atom-probe analyses of different phases in different types of steels exist as steels are one of the most important materials. It is possible to investigate how the magnetic properties of alloys are correlated to the microstructures of different phases in the alloys.57,58,59 The chemical contents, growth process and structures of metallic carbides in different alloy steels have been studied with the field ion microscope and the atom-probe field ion microscope.60 61 62 63 We refer the reader to some of the original papers published on these subjects. 

IRON, Fe (Ar 55 85) - IRON(II) Chemically pure iron is a silver-white, tenacious, and ductile metal. It melts at 1535°C. The commercial metal is rarely pure and usually contains small quantities of carbide, silicide, phosphide, and sulphide of iron, and some graphite. These contaminants play an important role in the strength of iron structures. Iron can be magnetized. Dilute or concentrated hydrochloric acid and dilute sulphuric acid dissolve iron, when iron(II) salts and hydrogen gas are produced. 

Alloys Borates Solid-state Chemistry Carbides Transition Metal Solid-state Chemistry Chalcogenides Solid-state Chemistry Diffraction Methods in Inorganic Chemistry Electronic Structure of Solids Fluorides Solid-state Chemistry Halides Solid-state Chemistry Intercalation Chemistry Ionic Conductors Magnetic Oxides Magnetism of Extended Arrays in Inorganic Solids Nitrides Transition Metal Solid-state Chemistry Noncrystalline Solids Oxide Catalysts in Solid-state Chemistry Oxides Solid-state Chemistry Quasicrystals Semiconductor Interfaces Solids Characterization by Powder Diffraction Solids Computer Modeling Superconductivity Surfaces. 

The most numerous and most interesting compounds with the perovskite structure are oxides. Some hydrides, carbides, halides, and nitrides also crystallize with this structure (4). This review will refer only to the study of oxides and their behavior in the gas-solid interface and in heterogeneous catalysis. It will not cover, however, electric, magnetic, and optical properties of perovskites. Comprehensive studies on these... 

Other formally divalent compounds are the hydrides, MH2 (page 186), and the sulfides, MS, e.g., the golden-yellow LaS. These sulfides have the NaCl-type structure and are metallic conductors they are best formulated as M3+(S2 )e. Similarly the carbides, MC2, which give acetylene on hydrolysis, are M3 + (C2 )e. The sulfides of Sm, Eu and Yb are, however, in the M2 + state according to their magnetic susceptibilities. 

Magnetic methods are, like x-ray diffraction, a tool for gaining structural information. These methods have been used to measure the effective dispersion of a paramagnetic oxide such as chromia gel or chromia supported on alumina and to determine oxidation states and bonding types under conditions where other procedures are difficult or inapplicable. Magnetic methods are useful also in the identification and estimation of ferromagnetic components such as iron carbide in Pischer-Tropsch or synthetic ammonia catalysts. 

Altounian, Z., Chan, X., Liao, L. X., Ryan, D. H. Strom-Olsen, J. O. (1993). Structure and magnetic properties of rare earth iron nitrides, carbides and carbonitrides. Journal of Applied Physics, 73, 6017-22. 

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