Sectioning technique materials

As in the preceding section, techniques will be given for the gas chromatographic analysis of the major classes of abused drugs as isolated from biological material. 

It is important to bear such points in mind before sampling and preparing the specimen for mounting. Specimen sampling procedures, orientation, surface preparation and specimen mounting techniques should be decided before sectioning the material rather than later. 

An explosion results when a material undergoes rapid reaction that results in a violent release of energy. Such reactions can occur spontaneously or be initiated and can produce pressures, gases, and fumes that are hazardous. Highly reactive and explosive materials used in the laboratory require appropriate procedures. In this section, techniques for identifying and handling potentially explosive materials are discussed. 

When processing thermoplastic materials, material properties not only dictate drying and processing conditions, viscosity, orientation, and shrinkage, but also the processing techniques and equipment that can be used. The next section reviews material properties with an emphasis on processing temperatures, particle properties, melt viscosity and elasticity, and orientation, relaxation, crystallization, and shrinkage. 

TEM micrographs and XES analysis of all composite materials using a cross-section technique, as weN as preliminary catalytic tests will be published in a forthcoming paper. 

The diffusion of Co in epitaxial n-type layers on the (100) surface of Cr-doped material, or in Sn-doped crystals, was studied by using radiotracer ( Co) and sectioning techniques. It was deduced that the diffusivity of Co at 800 to lOOOC could be described by ... 

The diffusion of Ge in B-doped material (about 1016 or lOl /cm ) was investigated at 1000 to 1200C by using radiotracer and sectioning techniques. At low doping levels, it was found that the diffusivity was described by ... 

Serial sectioning techniques were used to investigate the diffusion of 44xi in p-type material at 1000 to 1250C. It was found that the results could be described by ... 

A serial sectioning technique was used to study the diffusion of in material which contained about 5ppm of impurities. The data for 305 to 427C could be described by ... 

The serial sectioning technique was used to study diffusion in ultra-pure crystals and pure crystals. The diffusion of Mn2+ in intrinsic material was found... 

The diffusion of uranium was measured using radioactive tracers and sectioning techniques. The diffusion in stoichiometric material as a function of temperature was described by ... 

Thin Section. A section of material that has been prepared, by grinding to extreme thinness (about 30pm), for examination by transmitted light under a polarizing microscope. For details of the technique see such books as Thin Section Mineralogy of Ceramic Materials by G. 

---