The structure of real materials using x-ray and neutron scattering

Current Opinion in Solid State and Materials Science

Volumn 1, Issue 4, 1996, Pages 477-484

  Billinge, Simon J L ^a  

^a MICHIGAN STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000818443     PISSN: 13590286     EISSN: None     Source Type: Journal    
DOI: 10.1016/S1359-0286(96)80061-1     Document Type: Article

References (64)

1. Majkrzak CF: Fundamentals of specular neutron reflectometry. Mat Res Soc Symp Proc 1995, 376:143-155.
2. Felcher GP, Adenwalla S, de Haan VO, Van Well AA: Zeeman splitting of surface scattered neutrons. Nature 1995, 377:409-410. A never before observed phenomenon is reported in a grazing incidence polarized neutron reflectometry experiment carried out in a magnetic field. Neutrons undergoing a spin-flip, on being reflected, exchange energy with the magnetic field (they make a transition between the Zeeman split levels of the neutron moment in the field) in a subtle inelastic process. The scale of the energy exchange is -0.25 μeV (the neutron Zeeman splitting in the 20 kV field), yet is easily measured because of the high-sensitivity of the grazing incidence geometry to the neutron energy.
3. Terminello LJ, Shinn ND, Ice GE, D'Amico KL, Perry DL (Eds): Applications of Synchrotron Radiation Techniques to Materials Science II. Mat Res Soc Symp Proc vol 375, 1995. This proceeding focuses on synchrotron x-ray studies on reduced dimensional systems, notably surfaces and interfaces.
4. Ferrer S, Torvelles X, Etgens VH, Van der Vegt HA, Fajardo P: Atomic structure of the c(4×2) surface reconstruction of Ge(001) as determined by x-ray diffraction. Phys Rev Lett 1995, 75:1771-1774.
5. Pynn R: What can we learn from off-specular neutron reflection? Mat Res Soc Symp Proc 1995, 376:165-173.
6. Sinha SK: Diffuse neutron scattering from surfaces and interfaces. Mat Res Soc Symp Proc 1995, 376:175-185.
7. Reider R, Wobrauschek P, Ladisich W, Streli C, Aiginger H, Garbe S, Gaul G, Knöchel A, Lechtenberg F: Total reflection x-ray fluorescence analysis with synchrotron radiation monochromatized by multilayer structures. Nucl Instrum Meth Phys Res A 1995, 355:648-653.
8. Urbach HP, de Bokx PK: Calculation of intensities in grazing-emission x-ray fluorescence. Phys Rev B 1996, 53:3752-3763.
9. Neumann DA, Russell TP, Wuensch BJ (Eds): Neutron scattering in Materials Science. Mat Res Soc Symp Proc vol 376, 1995. This volume contains, among other things, a variety of recent studies utilizing x-ray and neutron small angle scattering to look at polymeric and cementitious materials.
10. Sette F, Ruocco G, Krisch M, Bergmann U, Masciovecchio C, Mazzacurati V, Signorelli G, Verbeni R: Collective dynamics in water by high energy-resolution inelastic x-ray scattering. Phys Rev Lett 1995, 75:850-853. Ground breaking demonstration of the use of x-rays for studying meV energy excitations in condensed systems. In this case a 'fast-sound' mode was observed in liquid water which had been predicted from molecular dynamics. This mode had already been observed by neutrons. The x-ray measurement was able to extend the Q range over which the dispersion was measured and demonstrate, using an isotope effect, that the sound wave involved all of the water molecule and not just the hydrogen network. This work is opening a new chapter in the study of excitations in condensed systems using x-rays and has already led to vigorous debate in the literature.
11. Everitt BA, Salamon MB, Park BJ, Flynn CP, Thurston T, Gibbs D: X-ray magnetic scattering from nonmagnetic Lu in a DyLu Alloy. Phys Rev Lett 1995, 75:3182-3185.
12. Tonnerre JM, Sève L, Raoux D, Soulliè G, Rodmacq B, Wolfers P: Soft x-ray resonant magnetic scattering from a magnetically coupled Ag/Ni multilayer. Phys Rev Lett 1995, 75:740-743. Resonant magnetic scattering takes advantage of the large resonantly enhanced magnetic cross-section at the L- and M-absorption edges of a magnetic ion. The L-absorption edges of 3d transition metal ions are too low in energy to do useful crystallography, but the magnetic structure of multilayer heterostructures can be studied. This is a very nice example of such work used to study Ag/Ni multilayers. These authors also extend the analysis to extract spin and orbital moments in the same way as is possible from x-ray magnetic dichroism. In this case it is possible to differentiate between ferromagnetically and antiferromagnetically coupled moments. The spin and orbital moments are obtained from the real and imaginary parts of the anomalous contribution to the x-ray scattering length, f′ and f″ respectively, which are determined from the intensity and width, respectively, of the magnetic Bragg peaks. These appear in different regions of Q-space for the ferromagnetically and antiferromagnetically coupled moments respectively.
13. Birgeneau RJ, Feng Q, Harris QJ, Hill JP, Ramirez AP, Thurston TR: X-ray and neutron scattering, magnetization, and heat capacity study of the 3D random field ising model. Phys Rev Lett 1995, 75:1198-1201.
14. Chen CT, Idzerda YU, Lin H-J, Smith NV, Meigs G, Chaban E, Ho GH, Pellegrin E, Sette F: Experimental confirmation of the x-ray magnetic dichroism sum rules for iron and cobalt Phys Rev Lett 1995, 75:152-155. X-ray magnetic circular dichroism takes advantage of the fact that the absorption of left and right circularly polarized photons is different when the absorbing process is not symmetric under time-reversal. Arguably the most useful application is to measure the magnetic moments of chemical species in solids. An extremely important development has been the derivation of sum rules (see [15,16]) allowing the orbital and spin components of the moment to be measured directly for a given chemical species. The verification of these sum rules has been controversial. These authors make careful absorption measurements in transmission geometry, removing a lot of earlier experimental uncertainties, and find excellent agreement with the proposed sum rules.
15. Thole BT, Carra P, Sette F, Van der Laan G: X-ray circular dichroism as a probe of orbital magnetism. Phys Rev Lett 1992, 68:1943-1946.
16. Carra P, Thole BT, Altarelli M, Wang X: X-ray circular dichroism and local magnetic fields. Phys Rev Lett 1993, 70:694-697.
17. Alders D, Vogel J, Levelut C, Peacor SD, Hibma T, Sacchi M, Tjeng LH, Chen CT, van der Laan G, Thole BT, Sawatzky G: Magnetic x-ray dichroism study of the nearest-neighbour spin-spin correlation function and long-range magnetic order parameter in antiferromagnetic NiO. Europhys Lett 1995, 32:259-265. The dependence of the line-shape of x-ray absorption lines on the magnitude of the exchange field in a ferromagnetic material is pointed out. This information can be used to determine the nearest-neighbour spin-spin correlation function. This makes x-ray absorption measurements potentially a very pow-erful tool for measuring not only element specific on-site magnetic moments (using dichroism discussed above), but also the nearest-neighbour spin-spin interactions in magnetic materials.
18. Iberl A, Schuster M, Göbel H, Meyer A, Matz R, Snigirev A, Snigireva I, Freund A, Lengeler B, Heinecke H: Micro-focus double-crystal x-ray diffractometry on III-V heterostructures grown by selective-area epitaxy. J Phys D - Appl Phys 1995, 28:A200-A205.
19. 3 crystal.
20. 3.
21. Henderson E, Turrillas X, Barnes P: The formation, stability and microstructure of calcium sulpoaluminate hydrates present in hydrated cement pastes using in-situ synchrotron energy-dispersive diffraction. J Mater Sci 1995, 30:3856-3862.
22. ••].
23. 3Al. This study extends the technique to look at the relatively weak scattering from a poorly ordered material, albeit an ideal model system: the diffusion coefficient of Brownian motion in a gold colloidal suspension is reported.
24. 4 was studied on a millisecond time scale using pulsed neutron diffraction. This is one of the first attempts to study structure under nonequilibrium and time varying conditions using neutrons, and the first attempt on these time-scales.
25. Motokawa M, Arai M: Neutron diffraction under high magnetic fields. Physica B 1995, 213-214:1017-1021.
26. Vitale V, Bull LM, Morris RE, Cheetham AK, Toby BH, Coe CG, MacDougall JE: Combined neutron and x-ray powder diffraction study of zeolite Ca LSX and a 2H NMR study of its complex with benzene. J Phys Chem 1995, 99:16087-16092. This study exemplifies what can be accomplished by the simultaneous Rietveld refinement of multiple datasets, in this case using x-ray and neutron data. Increasingly, in the future, this approach will need to be taken to characterize the greater complexity often apparent in newly discovered materials.
27. Robinson RA, Lawson AC, Larson AC, Von Dreele RB, Goldstone JA: Rietveld refinement of magnetic structures from pulsed-neutron-source powder-diffraction data. Physica B 1995, 213-214:985-989.
28. 4+d. Phys Rev B 1995, 52:15636-15643.
29. Jayaraman A: Diamond anvil cell and high-pressure physical investigations. Rev Mod Phys 1983, 55:65-108.
30. Jayaraman A: Ultrahigh pressures. Rev Sci Instr 1986, 57:1013-1031.
31. Klotz S, Besson JM, Hamel G, Nelmes RJ, Loveday JS, Marshall WG, Wilson RM: Neutron diffraction at pressures beyond 25 GPa. Appl Phys Lett 1995, 66:1735-1737.
32. Snaked H, Shimakawa Y, Hunter BA, Hitterman RL, Jorgensen JD, Han PD, Payne DA: Superconductivity in the Sr-Ca-Cu-O system and the phase with infinite-layer structure. Phys Rev B 1995, 51:11748-11790.
33. Noyan IC, Huang TC, York BR: Residual stress/strain analysis in thin films by x-ray diffraction. Crit Rev Solid State Mat Sci 1995, 20:125-177.
34. Holden TM: The determination of macrostresses (type-I stresses) and microstresses (type-II stresses) by neutron diffraction. Mat Res Soc Symp Proc 1995, 376:385-390.
35. Cervinka L, Wright AC (Eds): Proceedings of the sixth international conference on the structure of non-crystalline materials. J Non-Cryst Solids 1995, 192/193:1-714. These proceedings contain an extensive overview of recent studies of the structure of liquids and amorphous materials.
36. c superconductors. In Physical Properties of High Temperature Superconductors V. Edited by Ginsberg DM. Singapore: World-Scientific; 1996.
37. 3. Ferroelectrics 1995, 164:133-148.
38. Kwei GH, Billinge SJL, Cheong S-W, Saxton JG: Pair distribution functions of ferroelectric perovskites: direct observation of structural ground states. Ferroelectrics 1995, 164:57-73.
39. 3 as measured by differential anomalous x-ray scattering. Phys Rev B 1995, 52:10005-10034.
40. Regan MJ, Bienenstock A: Phase separation in sputtered amorphous metal-germanium alloys Phys Rev B 1995, 51:12170-12185. An elegant application of small angle scattering and anomalous dispersion to recover reliable information about phase separation on the 10-30 Å scale in amorphous FeGe and MoGe thin films.
41. 2 is minimized. This volume (A345) of the journal contains the 'Proceedings of the Third Workshop on Neutron Scattering Data Analysis', and contains a number of interesting articles on advanced computational analyses of scattering data
42. Egami T: Determining medium-range order by powder diffraction. J Phys Chem Solids 1995, 56:1407-1413.
43. Burgess AN, Mort KA, Johnson KA, Cooper DL, Rogers SC, Howells WS: Neutron diffraction plus molecular dynamics: a powerful approach for understanding liquid structure. Nucl Instr Meth Phys Res A 1995, 354:81-86.
44. Soper AK: Estimating the three-body correlation function for a liquid using spherical harmonic analysis. Nucl Instr Meth Phys Res A 1995, 354:87-95.
45. 4 materials from neutron powder diffraction data Mater Res Soc Symp Proc 1995, 376:523-528.
46. Hannon AC, Arai M, Delaplane RG: A dynamic correlation function from inelastic neutron scattering data. Nucl Instr Meth Phys Res A 1995, 354:96-103.
47. Egami T, Dmowski W, Kosmetatos P, Boord M, Tomida T, Oikawa E, Inoue A: Deformation Induced bond orientational order in metallic glasses. J Non-Cryst Solids 1995, 192/193:591-594.
48. Keen DA, McGreevy RL, Bewley RI, Cywinski R: Magnetic structure determination of amorphous materials using RMC modelling of neutron diffraction data. Nucl Instr Meth Phys Res A 1995, 354:48-52.
49. Sparks C, Ice G, Jiang X, Zschack P: Static displacements of atoms in crystalline metallic solid solutions. Mat Res Soc Symp Proc 1995, 375:213-220.
50. Moss SC: Neutron studies of disordered alloys: a brief review/update. Mat Res Soc Symp Proc 1995, 376:675-687. An excellent current overview of the field including some history, formalism and recent studies. These studies are becoming increasingly important since computer electronic-band structure calculations are becoming more sophisticated and capable of taking account of realistic distorted local structures.
51. 60 crystal. The static and dynamic components of the disorder were separated by resolving the energy. A wide range of Q-space was sampled, point-by-point, using a triple-axis spectrometer. The results were in excellent agreement with those in [52], a powder diffraction study. The work by David et al. [52] was published before 1995, but is a powder-diffraction tour-de-force and rewards a careful reading.
52. 60. Proc Roy Soc London Ser A 1993, 442:129-143.
53. Proffen Th, Neder RB, Frey F: Neutron and x-ray diffuse scattering of calcium-stabilized zirconia. Acta Crystallogr B - Struct Sci 1996, 52:59-65.
54. Karsten K, Ehrhart P: Frenkel pairs in low-temperature electron-irradiated InP: x-ray diffraction. Phys Rev B 1995, 51:10508-10519.
55. 4. Phys Rev B 1995, 52:6829-6839.
56. 4. Phys Rev Lett 1994, 72:3421-3424.
57. Bahr D, Press W, Jebasinski R, Mantl S: Diffuse scattering from thin films with defects. Phys Rev B 1995, 51:12223-12227. Here it is demonstrated that grazing incidence diffraction yields significant information about defect densities as a function of depth below the surface of a thin film. The depth profiled is varied by changing the angle of incidence. The theory of Barabash and Krivoglaz (Barabash, RI and Krivoglaz MA: Static fluctuation waves and the scattering of x-rays or neutrons from defects in thin films and surface layers. Sov Phys Solid State 1987, 29:1768) is reviewed and experimentally verified by studying a model system, thus opening the way for future studies of real systems.
58. Bahr D, Press W, Jebasinski R, Mantl S: Diffuse scattering from thin films with defects. Phys Rev B 1995, 51:12223-12227. Here it is demonstrated that grazing incidence diffraction yields significant information about defect densities as a function of depth below the surface of a thin film. The depth profiled is varied by changing the angle of incidence. The theory of Barabash and Krivoglaz (Barabash, RI and Krivoglaz MA: Static fluctuation waves and the scattering of x-rays or neutrons from defects in thin films and surface layers. Sov Phys Solid State 1987, 29:1768) is reviewed and experimentally verified by studying a model system, thus opening the way for future studies of real systems.
59. Nield VM, Whitworth RW: The structure of ice Ih from analysis of single-crystal neutron diffuse-scattering. J Phys - Condens Matter 1995, 7:8259-8271. Remarkable as it may seem, the structure of the normal form of ice, Ih, has not been fully characterized, despite being studied since 1922 (the initial studies were by WH Bragg himself). This study uses a novel single crystal reverse Monte Carlo approach to model the diffuse scattering from a neutron single crystal experiment to reveal new insight into the arrangement of the water molecules which show significant disorder.
60. Wilson CC: Monitoring phase transitions using a single data frame in neutron time-of-flight Laue diffraction. J Appl Cryst 1995, 28:7-13.
61. Hajdu J, Machin PA, Campbell JW, Greenhough TJ, Clifton IJ, Zurek S, Gover S, Johnson LN, Elder M: Millisecond x-ray diffraction and the first electron density map from Laue photographs of a protein crystal. Nature 1987, 329:178-181.
62. c superconductivity.
63. 4. Phys Rev Lett 1996, 76:1344-1347.
64. c=37.3). Phys Rev Lett 1995, 75:1626-1629.