Materials Science Research Horizons by Hans P. Glick

By Hans P. Glick

Fabrics technological know-how comprises these elements of chemistry and physics that take care of the houses of fabrics. It encompasses 4 periods of fabrics, the examine of every of that may be thought of a separate box: metals; ceramics; polymers and composites. fabrics technological know-how is frequently known as fabrics technological know-how and engineering since it has many purposes. commercial functions of fabrics technology contain processing concepts (casting, rolling, welding, ion implantation, crystal progress, thin-film deposition, sintering, glassblowing, etc.), analytical thoughts (electron microscopy, x-ray diffraction, calorimetry, nuclear microscopy (HEFIB) etc.), fabrics layout, and cost/benefit tradeoffs in business construction of fabrics. This ebook offers new study instructions during this rapid-growing box.

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The photooxidation of lead has been observed in silicate glasses with higher basicity [67]. In the more ionic phosphate and FP glasses is also the photoreduction of Pb2+ to (Pb2+)- known. Pb is found in NSP glasses to 100 % its lower oxidation state as s2p0 ion. The UV-absorption edge is shifted into the visible for the doped glasses. The exact position of the s Æ p transitions of Pb2+ depends strongly on the glass matrix. With higher optical basicity of the glass shifts the band from 220 nm in acidic FP glasses to 250 nm in highly alkaline silicate glasses.

6-13). While POHC formation is of similar magnitude in both glasses when the optical spectra after the final irradiation are compared is the POHC signal much higher in the NSP than in the FP10 sample. 6-15). Two duran type samples doped with either 200 or 50 ppm Pb were also irradiated with the 248 nm laser. 48 Doris Möncke and Doris Ehrt Figure 6-15. 5 mm). Figure 6-16. 5mm). Arsenic and Antimony NSP and FP10 samples doped with 5000 ppm As or Sb were irradiated at 248 nm. The transmission spectra of the doped glasses are characterized by prominent s-p transitions that shape the absorption edge in the UV.

Of all glasses studied showed an NSP glass doped with 5000 ppm silver the strongest laser induced transmission losses. On the other hand depend the laser induced transmission changes strongly on the concentration of silver in the glass and like the duran type sample were only few defects observed in an FP10 glass doped with 50 ppm Ag. Silver ions are less soluble in FP than in NSP glasses and colloidal silver segregates in FP glasses in concentrations above 50 ppm. 6-5a is evidence to the presence of colloidal Ag0 in this sample.

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