Alloys neutron scattering

T.R. Finlayson and H.G. Smith, Neutron scattering studies of premartensitic indium-thallium alloys. Met. Trans A 19A 193 (1988). 

In addition, many of the ferroelectric solids are mixed ions systems, or alloys, for which local disorder influences the properties. The effect of disorder is most pronounced in the relaxor ferroelectrics, which show glassy ferroelectric behavior with diffuse phase transition [1]. In this chapter we focus on the effect of local disorder on the ferroelectric solids including the relaxor ferroelectrics. As the means of studying the local structure and dynamics we rely mainly on neutron scattering methods coupled with the real-space pair-density function (PDF) analysis. 

S.K. Sinha, Magnetic structures and inelastic neutron scattering metals, alloys and compounds 489... 

Various investigations have been carried out on steels and aluminium alloys, by adopting different techniques, in particular radiography, microanalysis and Small Angle Neutron Scattering (SANS). 

Using this local moment model, and using band theory or its variations, a number of workers have been able to formulate expressions which represent the measured magnetic data reasonably well, at least for the case where well-localized moments are developed on the solute atoms (II, 18). However, considerably more data has become available on other properties of dilute alloys, including data on resistivity and specific heat, neutron scattering, various magnetic resonance experiments, Moss-bauer measurements, Kondo effect, and the like. Measurements have been extended also to alloys of many other systems besides those involving the platinum metals. 

Fig. 2.13. Small angle neutron scattering of a-Si H and a-Si, j.C, H alloys showing the presence of voids with a density which increases with carbon concentration (Mahan et al. 1989).

Sample solutions were prepared by dissolving into D2O Li Cl (a null mixture of Li and Li) and Li Cl for Li-enriched solutions, and Li Cl and Li Cl for Cl-enriched solutions. The sample solution was sealed into a Ti-Zr null alloy cell with inner diameter of 8 mm. Pulsed neutron diffraction measurements were made with HIT at KENS, Japan, and with SANDALS at ISIS, UK. Neutron scattering measurements were also made for background, an empty can, and a vanadium rod. The observed neutron... 

This crystal structure was solved earlier (see sections 6.10 and 6.11), first using x-ray and then using neutron powder diffraction data. The x-ray data (Mo Ka radiation) were collected at room temperature, while the neutron scattering experiment (K = 1.494 A) was conducted at 200 K. Hence, combined Rietveld refinement is not feasible because of the differences in the lattice and structural parameters of the alloy due to thermal expansion, and we will use the two sets of data independently. 

J.F. Fernandez, M. Kemali D.K. Ross (1997). J. Alloys Cmpds., 253, 248-251. Incoherent inelastic neutron scattering from the C-15 Laves phase ZrTi2H3.6. 

P. Morris, D.K. Ross, S. Ivanov, D.R Weaver O. Serot (2004). J. Alloys and Compds., 363, 88-92. Inelastic neutron scattering study of the vibration frequencies of hydrogen in calcium dihydride. 

Fig. 2. High pressure sample cells a) cell made from stainless steel with Be-windows for X-ray scattering studies up to 2 kbar, b) cell made from NIMONIC 90 alloy with diamond windows for X-ray scattering studies up to 8 kbar, c) diamond anvil cell (DAC) for X-ray scattering studies up to 20 kbar, and d) cell made from an A1 alloy for neutron scattering studies up to 2.5 kbar (1 sample, 2 X-ray or neutron beam, 3 high pressure connection, 4 thermostating water circuit).

Ramirez-Cuesta A J, Mitchell P C H, Ross D K, Georgiev PA, Anderson PA, Langmi H W and Book D (2007a), Dihydrogen in zeolite CaX - an inelastic neutron scattering study , J Alloys Compd, 446-447, 393. 

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