JCPDS

Powder Diffraction File, Pub. SMA-29, JCPDS, International Centre for Diffraction Data, Swarthmore, Pa., 1979. 

JCPDS-ICDD Elemental and Lattice Spacing Index ilDDO). This index is available from JCPDS-International Centre for Diffraction Data, 1601 Park Lane Swarthmore, PA 19081. 

M. Faller, University of Berne, 1989, in JCPDS Database Coll. No. 42- 1347. 

Joint Committee on Powder Diffraction Standards (JCPDS), Standard Powder Diffraction File, International Center for Diffraction Data, Swarthmore, PA. 

In perovskite-type catalysts the formation of the final phase is completed already at 973 K. XRD and skeletal FTIR/FTFIR data for LalCol, LalMnl and LalFel calcined at 973 K evidence that only LalFel-973 is actually monophasic and consists of a perovskite-type phase with orthorombic structure. A perovskite type phase with hexagonal-rombohedral structure represents the main phase of LalCol-973, but traces of C03O4 and La2C05 are also present. In the case of LalMnl-973 two phases have been detected both with perovskite-type structure, one orthorombic and the other rombohedral. The calculated cell parameters of the dominant perovskite-type phase are reported in Table 1 for the three samples. The results compare well with those reported in the literature [JCPDS 37-1493, 32-484, 25-1060] which refer to similar samples prepared via solid state reartion. All the perovskite-type samples are markedly sintered... 

X-ray diffraction patterns were recorded on a Philips PW1820 diffractometer with Cu-Ka radiation (X = 0.154 nm). The collected sample was indexed very well as cubic a-Mn203 bixbyite (JCPDS 41-1442, la-3, a = 0.941 nm) (Fig. 1). The morphologies were visualized by scanning electron microscopy (SEM) (Fig. 1). The abundant well-defined hexagonal-like plates with the sizes from several hundred nanometers to a few micrometers were formed during hydrothermal treatment, which kept initial shape after 700 °C-calcination (Fig. 1). The hexagonal plates are about 50 nm thick with smooth surfaces. 

The XRD spectra for the nonvolatile material produced from the pyrolysis of 7, with the Joint Committee on Powder Diffraction Standards (JCPDS) reference patterns for CuInS2 (27-0159), confirmed it to be single-phase CuInS2 (see Fig. 6.9). Examination of the EDS spectra for the same samples shows predominant emissions from Cu, In, and S edges, with the approximate percentage atomic composition of 27, 23, and 50 for 7 and 28, 23, and 49 for 8, respectively, thus supporting the formation of CuInS2. 

Figure 6.10. XRD pattern of the nonvolatile solid obtained from bulk pyrolysis of [ PPh3 2CuGa(SEt)x] 9 (600 °C, 300min). All reflections correspond to gallite—CuGaS2 (JCPDS 25-0279).

Figure 6.15. XRD pattern of a spray CVD grown CuGaS2 film on Si (111), using SSP 9 Reflections correspond to those reported for gallite in JCPDS reference 25-0279.

JCPDS card 25-0297 Single crystal prepared from the elements... 

JCPDS Joint committee on powder diffraction standards LB Langmuir-Blodgett... 

Table 2.1 shows the crystal structure data of the phases existing in the Mg-H system. Pnre Mg has a hexagonal crystal structure and its hydride has a tetragonal lattice nnit cell (rutile type). The low-pressure MgH is commonly designated as P-MgH in order to differentiate it from its high-pressure polymorph, which will be discussed later. Figure 2.2 shows the crystal structure of p-MgH where the positions of Mg and H atoms are clearly discerned. Precise measurements of the lattice parameters of p-MgH by synchrotron X-ray diffraction yielded a = 0.45180(6) mn and c = 0.30211(4) nm [2]. The powder diffraction file JCPDS 12-0697 lists a = 0.4517 nm and c = 0.30205 nm. The density of MgH is 1.45 g/cm [3]. 

XRD spectra were compared to JCPDS file Calculated using Scherrer equation (King and Alexander, 1974). 

The crystal phase analysis was performed by XRD (not shown), revealing a main Y-AI2O3 phase (JCPDS 29-0063) for Ag/Al20s (I, II, IV, V), but Ag/Al20s (III) which was synthesized... 

Lignite samples were predried at 105 for 2 hours to remove the water which is a major component hence its removal, in effect, concentrates the mineral species. After drying, the samples were crushed using a mortar and pestle to pass 75 ym. The dried lignite powder was then mounted in a standard aluminium mounting plate and placed in a Philips x-ray diffractometer with a Rigaku power source. A Co x-ray tube was used to suppress fluorescence of any elemental species. The resultant diffraction pattern was resolved using the JCPDS -ICDD Powder diffraction index. 

Aust. J. Soil Res. 16 215-227 Joint Committee on Powder Diffraction Standards Mineral powder diffraction fde. Data book. Published by the JCPDS International Centre for Diffraction Data, Swarfhmore, Pennsylvania, U SA, pp. 942 Jolivet, J.P. Tronc, E. (1988) Interfadal electron transfer in colloidal spinel iron oxide. Conversion of Fe304 to y- Fe203 in aqueous medium. J. Colloid Interface Sci. 125 688—... 

Figure 1 reports the corresponding UV-Vis Diffuse Reflectance spectra. The band at 400 nm is relative to the CT between and its intensity was proportional to the amount of On the other hand, the intensity of the band at 900 nm decreased, relative to a d-d transition for in the vanadyl moiety. The XRD pattern of all samples, but ox3, corresponded to that of well-crystallized VPP in the case of sample ox3, additional reflections were due to the presence of 5-VOPO4 (JCPDS 37-0809). Therefore, the treatment of the VPP led to the generation of surface in samples oxl and ox2, and to the growth of crystalline VOPO4 in sample ox3. 

If the powder diffraction pattern is indeed a fingerprint for a given material, then it would seem desirable to have a library of the patterns for all known substances. In this way, the powder pattern of an unknown material could be compared to the known patterns in the library until a match is made. Such a file does exist. It is the JCPDS Powder Diffraction File (PDF) mentioned earlier (3). The PDF is published annually as a set of consecutively numbered "cards" (the idea of a card becoming somewhat... 

McClune, W.F., editor-in-chief, Powder Diffraction File, JCPDS-International Centre for Diffraction Data, Swarth-more, PA. 

X-Ray powder diffraction patterns are catalogued in the JCPDS data file,7 and can be used to identify crystalline solids, either as pure phases or as mixtures. Again, both the positions and the relative intensities of the features are important in interpretation of powder diffraction patterns, although it should be borne in mind that diffraction peak heights in the readout from the photon counter are somewhat dependent on particle size. For example, a solid deposit accumulating in a heat exchanger can be quickly identified from its X-ray powder diffraction pattern, and its source or mechanism of formation may be deduced—for instance, is it a corrosion product (if so, what is it, and where does it come from) or a contaminant introduced with the feedwater ... 

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