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It can be seen that the major peaks are indexed well with Card JCPDS（822425）[4] based on an orthorhombic perovskite-structure, which is almost the same as those of BaCeO3.
From Raman patterns of fig.2, the peak’s number decreasing at the low frequency range means that the symmetry of BCY(x) increase as x becomes large.
Considering the result of fig.2, the peak’s number decreases with the increasing of x imply the sample’s symmetry enhances, it can be concluded that ion Y3+ have taken place in the lattice position of Ce.

These results are in good accord with that reported in JCPDS data cards.
Each defect has its corresponding defect level, and the defect type determines the position and number of emission peak, but concentration determines the peak intensity.
Table 2 Attribution of the peaks number λ(nm)/E(eV) attribution 1 484/2.56 Zni→VZn transition 2 505/2.45 Oi→Zni transition 3 528/2.35 Ec→OZn transition 4 548/2.26 Ec→Oi transition 5 570/2.18 composition of the defect levels of the grain boundaries 6 603/2.05 Vo→Ev transition 7 630/1.97 transition superposition Fig.5 Photoluminescence spectrum of MgxZn1-xO measured at room temperature (a) ultraviolet region (b) visible region Summary We fabricated MgxZn1-xO films by electrodeposition on ITO-coated glass substrates.

A better understanding of matter at then a no scale has led to a number of advances in materials science having novel optical and electronic properties.
They have investigated the grain size, dislocaction density, strain, interplanar distance, miller indices, number of crystallites per unit area, lattice constants and bulk modulus of CdS nanostructures, and analyzed the thickness and optical properties transmissions, energy band gap, refractive index and optical dielectric constant where proved distinguished results compared with other ones.
All the miller indeces mentioned peaks are exactly matched with the hexagonal (wurtzite) structure of CdS corresponds to standard (JCPDS Data Card no. 020563) with lattice constants a = 4.142 Å, c = 6.724 Å, due to annealing temperature and different spin coating speeds.

Introduction A number of cermaic materials have been used traditionally as bio-materials, largely because they show high bio-compatibility, good resistance to corrosion and high wear resistance.
The corresponding reflections of JCPDS card number 09-0432 for crystalline hydroxyapatite are displayed.

Using soft template for controlling ZnO morphology, a stabilizer must be added during its synthesis and this increases the number of preparation steps.
All diffraction peaks matched well with the JCPDS card number 36-1451 so it can be concluded that all prepared ZnO solids crystallized in a hexagonal würtzite structure.

The XRD patterns were compared with the JCPDS file card no. 41-0347 for AlNbO4 crystal and found to be matching.
The inset of Fig. 3(a) shows the grain size is small and the number is few.
The Fig.3(b) shows grain size between 30-40 nm, the grain sizeis uniform, but the grain number not much.

The values obtained from X-ray diffraction were analyzed to determine the types of substances present by using ICDD card numbers, which are internationally maintained by JCPDS of ASTM.
At early ages, a number of new crystalline structures in the mineral kingdom were found in CBC rather than in OPC; these were: Gismondine, with the chemical formula CaAl2Si2O8·4[H2O]; Hatrurite, with the chemical formula Ca3(SiO4)O; and Wollastonite, with the chemical formula NaAlSi3O8.

Large number of thermal power plants generate huge quantities of fly ash causing serious environmental problem mainly due to its structure and toxic elements.
In the recent years, a number of technologies and methods have been developed for the fruitful utilization of fly ash[3-7].
It has a good agreement with the standard JCPDS Card( PDF 38-0237 ).

As shown in Fig.1, all diffraction peaks can be readily indexed as face-centered-cubic PbS structure with a lattice constant a = 5.93Å, coincided with the literature value (JCPDS card no.65-9496).
Isopropanol is known as a hole scavenger [23], which can preferentially react with photoexcited holes and results in great decrease of the number of holes contributing to photocatalysis.
This suggest that the decreasing number of holes caused by isopropanol has a great impact on the photocatalytic activity of PbS, confirming the importance of the hole in this photodegradation process.

Chemical precipitation technique has many advantages such as mild reaction conditions, less energy consumption, simple equipment and there are large numbers of variable factors in the preparation process which can be used.
All the diffraction peaks in the 2θ range measured corresponds to the face-centered cubic structure of copper with lattice constant a = 3.62Å and is in good agreement with the standard data card (JCPDS Card No. 85-1326) value.