X-ray diffraction curves

Fig. 7. X-ray diffraction curves for (Ga,Mn)As films obtained with Cu Kor radiation, (a) Mn concentration dependence of peak positions [(004) reflection] of ISO-nm thick (Ga,Mn)As grown on GaAs with compressive strain (Ohno et al. 1996a). (b) (Ga,Mn)As grown on (In.Ga)As buffer layer with tensile strain, (c) Double-crystal x-ray diffraction curves for a 2 /rm-thick (Ga,Mn)As showing the asymmetric (224) reflection with high- and...

According to an x-ray diffraction curve, a slight amount of crystallinity was present... 

The information given by an X-ray diffraction curve for a solution is one dimensional only. By a Fourier inversion it can be transformed into... 

TABLE 2 FWHM of X-ray diffraction curve versus GaN thickness on sapphire with GaN buffer layer [19],... 

Drits VA, Sakharov BA, Manceau A (1993) Stmctnre of feroxyhite as determined by simulation of X-ray diffraction curves. Clay Minerals 209-222... 

Zhdanov and Vorona have made a detailed X-ray study of the effects of temperature upon the various forms of copper phthalocyanine (381). If copper phthalocyanine is sublimed between 150° and 250°C, the a modification is observed. Below this temperature range, the a modification is mixed with another unknown form. Heating for 20 minutes at 315°C or evaporation at 280°-300°C produces the 8 modification. The a and 8 forms of copper phthalocyanine differ in tinctorial power. The reflectance spectrum of the a form exhibits a fairly broad band at 480-487 m/i while this band occurs at 475-478 mu in the 8 form (317). An X-ray diffraction curve has been reported (80) for a third, y, form of copper phthalocyanine (212). The interplanar spacings for this complex are compared in Table III with... 

FIGURE 10.8 X-ray diffraction curves the intensity / as a function of angle for totally amorphous polypropylene (shaded area), and for a sample with a 50% crystalline content. 

In Fig. 3 the small-angle x-ray diffraction curves of human SC measured at room temperature is drawn. This diffraction curve is characterized by a strong and a weak peak. Both peaks consist of a main position and a shoulder on the right-hand side. After recrystallization from 120°C the diffraction curs es re ealed a series of peaks that are located ai the same inteipeak distance, which is a characteristic diffraction pattern of a lamellar phase. From the positions of the various peidcs it could be concluded lliat a lamellar phase with a periodicity of 13.4 nm was present Comparing the peak positions in the diffraction curve after lecrystal-ILzation with those present in the diffraction curve from untreated SC revealed... 

The surface morphology of the coatings stays the same after heat treatment at 400° C for 6 h. X-ray diffraction curves showed amorphous structures for both coatings before and after the heat treatment and there was no structural change. These results indicate that the coatings possess high thermodynamic stability. 

Figure 12.22 X-ray diffraction curve for graphitized carbon made from a cellulosic precursor.

Figure 8.8 The X-ray diffraction curves of (a) montmoriUonite without modifications and (b) with exchange cation [84].

Chen Guoxi, Zhang Yueming, et al., Handbook of Thermal Analysis and X-Ray Diffraction Curves of Minerals. Chengdu, Sichuan Science and Technology Press, 1989. 

Figure 5 shows typical x-ray diffraction curves of two types of polyacetylene films. The usual Shirakawa-type film [1,23] gave a very sharp diffraction curve. The halfwidth of the x-ray diffraction peak at 2 of 23.2 (110 and 2(X) reflections) was small (A20 = 1.2 ). However, it increased to 1.8 after the heat treatment for thermal isomerization from cis to trans form, implying that the ordered crystal structure in the as-grown cis-rich film suffered some destruction in the trans film. On the other hand, the highly stretchable film synthesized by the SE method gave a little diffused diffraction curve, as shown in Fig. 5. As the mechanical stretching proceeds, the half-width of the x-ray diffraction peak (A20 = 2.0°) decreased drastically to 1.5...

FIGURE 5 X-ray diffraction curves of S-type (1) and highly stretchable (2) films. 

DuMond J W M (1947) Method of correcting low angle X-ray diffraction curves for the study of small particle sizes, Phys Rev 72 83-84. 

Figure 4. X-ray diffraction curves for strained and unstrained 600EW ester samples and for 600 EW ionomer.

It is evident from the previous section that in the multiple-site model the copolymer is a mixture of copolymers of different composition this fact alone accounts to a some extent for the experimentally determined copolymer blockiness. However, a study of the copolymer fractions demonstrates that it cannot explain all the results. The blockiness of the copolymer fractions remains high therefore the tendency to block formation is an intrinsic property of active sites rather than merely the result of copolymer mixing. For example, when the pro-pylene-butene-1 copolymer was Ihictionated (156), the resulting narrow fractions of composition Cp, 30-50% exhibit X-ray diffraction curves containing crystallinity peaks of both polypropylene and polybutene-1 type. An analogous result was demonstrated us (66) the blockiness of the fractions of propylene-4-methylpentene-l copolymers insoluble... 

Fig. 10 Small angle x-ray diffraction curves of reduced and swollen hair and...

Figure 15. X-ray diffraction curves of untreated and glycol-saturated oriented clay mineral aggregates, showing variations of clay mineralogy, in respect to distance above and below the iron-rich zone in the sediments from Crittenden County, Kentucky. The depths of the samples are indicated on the right in feet. Note particularly the change in relative abundance of expansible and nonexpansible materials in the 2d interval between 5° and 10° from sample 0.2 to sample 5.8.

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