The crystallographic structural parameters were analyzed using X’Pert-MPD XRD a laboratory X-ray source having BraggBrentano parafocusing optics. The line profile characteristics was obtained using ProFit -software based on Pseudo-Voigt profile function and is applicable for the study of interplaner spacing d, crystallite size Dhkl, percent crystallinity %C, macromolecular orientation and other...

The existence of a quasi-liquid layer on the surface of ice crystals at temperatures not far belaw O°C is widely accepted on the basis of many experimental and theoretical studies (e.g., 1-4). However, there has been no experimental study including the direct information on, the structure of the quasi-liquid layer. It is therefore highly desirable to obtain structural data by X-ray diffraction ...

introduction: the aim of this study was to compare the chemical compounds of white proroot mineral trioxide aggregate (wmta) hydrated at different ph environments. methods and materials: mixed samples of wmta were kept in acidic (ph=5.4), neutral (ph=7.4) and alkaline (ph=9.4) environments for 48 h. then, x-ray diffraction (xrd) analysis was performed for both hydrated and powder forms of wmta....

oxide nanoparticles can exhibit unique physical and chemical properties due to their limited size and a high density of corner or edge surface sites. in this study, mgo nanoparticle was synthesized using mg(ch3coo)2 and hexamethylenetetramine as starting materials. the structure and optical properties of these particles are investigated by using x-ray diffraction (xrd), scanning electron micros...

the magnetite (fe3o4) – agar nanocomposite was prepared by co-precipitation of fe (iii) and fe (ii) ions for the first time. the obtained samples were characterized by x-ray diffraction, fourier-transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. ft-ir results confirm the formation of fe3o4 nanoparticles in agar matrix. the xrd results revealed th...

The striking feature of X-ray diffraction pattern vitreous silica is that the center its intense but broad ring located at nearly same position as strongest β-cristobalite. Two fundamentally different explanations to patterns were appeared about 90 years ago, one based on smallest crystals β-cristobalite and other non-crystalline continuous random network. This work briefly outlines facts suppo...