Diffraction, amorphous alloys neutron

X-ray electron and neutron diffraction have all been employed in studying the structure of amorphous alloys. Although the concepts and procedures outlined below are made with reference to X-ray diffraction, they can easily be extended to neutron diffraction and electron diffraction. 

In cases where the amorphous alloys give rise to ferromagnetic ordering it is also possible to combine X-ray diffraction with neutron diffraction, the latter measurements being performed for two different orientations of the magnetization (Sadoc and Dixmier, 1976). This method will lead to satisfactory results only when all the... 

In this chapter we present results of neutron diffraction and conputer simulation studies on hydrogenated and deuterated CuxTi. x(0.35 < x < 0.67) amorphous alloys. Ihe first part will serve as an illustration of the above considerations and presents the evolution of the interference functions and pair-correlation functions as a function of alloy composition and hydrogen or deuterium content -. In the second part we will use these eiqperlmental results to build up a computer model of these alloys. The last part will present the thermal evolution of a Cuq 50 TIq 50 Hq 5 amorphous alloy as followed by large-angle and small-angle neutron scattering ... 

The study of amorphous metal-hydrogen systems has started quite recently in contrast to the vast amount of work on the properties of crystalline metal-hydrogen systems that dates back over several decades and makes use of a great number of different techniques. The amorphous system a - Tij CuyHx has been studied by Inelastic Neutron Scattering (INS)" and Nuclear Magnetic Resonance (NMR) Very recently an extensive study of the structure of CuTi amorphous alloys and hydrides has been made by neutron diffraction and computer simulation (ref, 4 and references therein). 

Another characteristic point is the special attention that in intermetallic science, as in several fields of chemistry, needs to be dedicated to the structural aspects and to the description of the phases. The structure of intermetallic alloys in their different states, liquid, amorphous (glassy), quasi-crystalline and fully, three-dimensionally (3D) periodic crystalline are closely related to the different properties shown by these substances. Two chapters are therefore dedicated to selected aspects of intermetallic structural chemistry. Particular attention is dedicated to the solid state, in which a very large variety of properties and structures can be found. Solid intermetallic phases, generally non-molecular by nature, are characterized by their 3D crystal (or quasicrystal) structure. A great many crystal structures (often complex or very complex) have been elucidated, and intermetallic crystallochemistry is a fundamental topic of reference. A great number of papers have been published containing results obtained by powder and single crystal X-ray diffractometry and by neutron and electron diffraction methods. A characteristic nomenclature and several symbols and representations have been developed for the description, classification and identification of these phases. 

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