نتایج جستجو برای: metal powder

تعداد نتایج: 240735  

Journal: :Journal of the Society of Powder Technology, Japan 1985

Journal: :Journal of the Society of Materials Science, Japan 1973

2011
C. F. Gutierrez-Gonzalez S. Agouram R. Torrecillas

This work describes a wet-processing route based on spray-freezing and subsequent lyophilization designed to obtain nanostructured ceramic/metal powders. Starting from the ceramic powder and the corresponding metal salt, a water-based suspension is sprayed on liquid nitrogen. The frozen powders are subsequently freeze-dried, calcined and reduced. The material was analyzed using X-ray diffractio...

2013
Oxana V. Magdysyuk Robert E. Dinnebier Martin Jansen

Conventional Fourier analysis is one of the most commonly used methods for localization of missing atoms in crystal structures from powder diffraction data. A “perfect” Fourier map would require a complete set of structure factors up to a resolution of at least sin/ = 5.0 Å. In the case of powder diffraction, accessible information is limited, as compared to single crystal diffraction, mainl...

A. Beitollahi1, B. Alinejad1,, H. Sarpoolaky1,, S. Afshar2,

Abstract: Nanocrystalline MgAl2O4 spinel powder was synthesized using metal nitrates and a polymer matrix-based composed of sucrose and polyvinyl alcohol (PVA). The precursor and the calcined powders were characterized by simultaneous thermal analysis (STA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). According to XRD res...

2006
P. S. Whitfield P. W. Stephens

The presence of multiple, neighbouring transition metals presents a challenge for powder diffraction when trying to locate individual elements in a structure. Combining the information in X-ray and neutron data in simultaneous refinements has historically been a powerful tool. However, increasingly complex compositions require more information and element contrast than two datasets can provide....

Journal: :Journal of the Japan Society of Precision Engineering 1969

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