Titanium parameter values

Summary of Parameter Values for Quartz, Gold (and Titanium), and Water... 

FIG. 6. Normalized response functions [see Eqs. (74) and (75) and associated discussion] obtained using the fast amplifier (O) with the titanium-sapphire laser k = 798 nm fwhm = 100 fs) and using the old amplifier ( ) with the NdYAG laser (k = 1060 nm fwhm = 8 ns). Solid lines are optimized fits generated using Eq. (76) with parameter values given in text. 

In all cases, the three or four peaks observed at low diffraction angles could be indexed to only one hexagonal phase and the unit cell parameter values are presented in Table 1. Additionally, no peaks at higher angles were observed, indicating the absence of any crystalline phases containing aluminium or titanium, even for the higher metal contents used. 

Bollnow also evaluated the Coulomb energy of anatase, the other tetragonal form of titanium dioxide, by again making the assumption of a constant Ti+4-0= distance in order to fix the value of the parameter. He found this energy to have a minimum value... 

The isomorphous substitution of Siiv by Ti,v was claimed by Taramasso, Perego, and Notari in 1983 for a new material with the composition xTi02(l - x)Si02 (0.0 x 0.04 M). This has the crystalline structure of silicalite-1 (or MF1) with Tilv in framework positions it was named titanium silicalite-1 or TS-1 (Taramasso el al., 1983). The occurrence of isomorphous substitution was deduced from the regular increase in unit-cell parameters with the degree of substitution and from the good agreement between the observed and calculated values of the Si—O and Ti—O distances. The same type of evidence had already been obtained by the same authors in the synthesis of crystalline microporous boron silicates, where the smaller B—O distance relative to Si—O causes a decrease in unit-cell parameters (Taramasso et al., 1980). 

A new parameter space for the synthesis of silsesquioxane precursors was defined by six different trichlorosilanes (R=cyclohexyl, cyclopentyl, phenyl, methyl, ethyl and tert-butyl) and three highly polar solvents [dimethyl sulfoxide (DMSO), water and formamide]. This parameter space was screened as a function of the activity in the epoxidation of 1-octene with tert-butyl hydroperoxide (TBHP) [26] displayed by the catalysts obtained after coordination of Ti(OBu)4 to the silsesquioxane structures. Fig. 9.4 shows the relative activities of the titanium silsesquioxanes together with those of the titanium silsesquioxanes obtained from silsesquioxanes synthesised in acetonitrile. The values are normalised to the activity of the complex obtained by reacting Ti(OBu)4 with the pure cyclopentyl silsesquioxane o7b3 [(c-C5H9)7Si7012Ti0C4H9]. 

From the point of view of the influences on both the mean size and the yield of titanium, it seems that the pH could be lower however, excessively low pH may aggravate corrosion of the equipment, while an excessively high concentration of TiCl4 would result in difficulties of operation. Combining these considerations, the optimal values finally determined for these three parameters are as follows ... 

What is clear from these analyses is that the avoidance of crevice corrosion will delay eventual container failure significantly, irrespective of whether it occurs by wall penetration or by HIC. With this is mind, the galvanic coupling technique (along with the associated analytical methods outlined above) can be used to compare qualitatively the crevice corrosion performance of a series of titanium alloys. Figs. 36A and B compare the parameter (/c, Ec, Ep) values ob-... 

The mean systematic deviation between the observed and the calculated values of the unit cell s mass—or, what amounts to the same thing, the density-increases as S/Ti decreases. Now, the sulfides belonging to the TiS2 and Ti2S3 phases are always well crystallized, and the errors in measuring lattice parameters and densities are of the same order. It is thus not unreasonable that the increase of this deviation should be due to the creation of sulfur vacancies, which proceeds simultaneously with the insertion of titanium. The observation has been previously made in connection with other analogous systems in which there is a transition from the compound MX2 to MX. 

The NMR parameters for titanium metal deduced in earlier studies by field sweeping techniques (Narath 1967, Ebert et al. 1986) have been confirmed by more recent room temperature FT NMR (Bastow et al. 1998a). The value of Xq deduced from the ( /2, 2) satellite transitions was used in an accurate simulation of the central transition, which required an axial Knight shift of 70 10 ppm. The Ti NMR spectra of a number of titanium aluminide alloys and TiAg have also been reported... 

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