Determination of the real structure of artificial and natural opals on the basis of three-dimensional reconstructions of reciprocal space

Eliseev, A. A.; Gorozhankin, D. F.; Napolskii, K. S.; Petukhov, Andrei V.; Sapoletova, N. A.; Vasilieva, A. V.; Grigoryeva, N. A.; Мистонов, А. А.; Byelov, Dmytro V.; Bouwman, Wim G.; Kvashnina, Kristina O.; Chernyshov, Dmitry; Bosak, A.; Grigoriev, S. V.

doi:10.1134/s0021364009160103

Cited by 20 publications

(15 citation statements)

References 29 publications

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“…In these two-dimensional slices all the specific Bragg rods are labelled and these can be classified as the Bragg rod families 10l, 20l and 21l. The observed Bragg rods reveal specific modulations of intensity along l, which are distinctly different from the results reported so far (Versmold et al, 1999;Petukhov et al, 2003;Hilhorst et al, 2009;Eliseev et al, 2009). In those studies, much larger colloidal crystals were investigated and the measured Bragg rod profiles, consisting of a smeared intensity distribution between the Bragg peaks, only provide information on the average stacking fault densities.…”

Section: Resultscontrasting

confidence: 63%

Double hexagonal close-packed structure revealed in a single colloidal crystal grain by Bragg rod analysis

et al. 2014

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Double hexagonal close-packed structure revealed in a single colloidal crystal grain by Bragg rod analysis A coherent X-ray diffraction study of a single colloidal crystal grain composed of silica spheres is reported. The diffraction data contain Bragg peaks and additional features in the form of Bragg rods, which are related to the stacking of the hexagonally close-packed layers. The profile of the Bragg rod shows distinct intensity modulations which, under the specific experimental conditions used here, are directly related to the stacking sequence of the layers. Using a model for the scattered intensity along the Bragg rod for an exact stacking sequence of a finite number of hexagonally close-packed layers, it is found that a double hexagonal close-packed stacking sequence is present in the colloidal crystal grain. This analysis method opens up ways to obtain crucial structural information from finite-sized crystalline samples by employing advanced third-generation X-ray sources.

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Section: Resultscontrasting

confidence: 63%

Double hexagonal close-packed structure revealed in a single colloidal crystal grain by Bragg rod analysis

et al. 2014

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“…Details of the investigation of IO imperfections are given in a number of papers. [24][25][26][27]39,40 One can consider IO as an assembly of small metallic particles duplicating the shape of the voids between the spheres and connected to each other via thin (several tens of nanometers) and long (several hundreds of nanometers) cross pieces. Hence, the voids of the artificial opal have quasicubic and quasitetrahedral shapes with concave surfaces.…”

Section: Methodsmentioning

confidence: 99%

Microwave properties of Ni-based ferromagnetic inverse opals

et al. 2012

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Investigations of microwave properties of Ni-based inverse ferromagnetic opal-like film with the [111] axis of the fcc structure along the normal direction to the film have been carried out in the 2-18 GHz frequency band. We observed multiple spin wave resonances for the magnetic field applied perpendicular to the film, i.e., along the [111] axis of this artificial crystal. For the field applied in the film plane, a broad band of microwave absorption is observed, which does not contain a fine structure. The field ranges of the responses observed are quite different for these two magnetization directions. This suggests a collective magnetic ground state or shape anisotropy and collective microwave dynamics for this foam-like material. This result is in agreement with SQUID measurements of hysteresis loops for the material. Two different models for this collective behavior are suggested that satisfactorily explain the major experimental results.

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“…To put it more exactly, our approach is based on microradian x-ray diffraction study and comparison of a number of IOLCs with different thickness, thereby implicitly characterizing the original matrix. Herewith, we propose using a 3D visualization of reciprocal space as a very intuitive representation [42,43]. For the reciprocal space reconstruction we used locally developed software.…”

Section: B Indirect Methods To Study the Layered Structure Of Originamentioning

confidence: 99%

Periodic order and defects in Ni-based inverse opal-like crystals on the mesoscopic and atomic scale

et al. 2014

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The structure of inverse opal crystals based on nickel was probed on the mesoscopic and atomic levels by a set of complementary techniques such as scanning electron microscopy and synchrotron microradian and wide-angle diffraction. The microradian diffraction revealed the mesoscopic-scale face-centered-cubic (fcc) ordering of spherical voids in the inverse opal-like structure with unit cell dimension of 750 ± 10 nm. The diffuse scattering data were used to map defects in the fcc structure as a function of the number of layers in the Ni inverse opal-like structure. The average lateral size of mesoscopic domains is found to be independent of the number of layers. 3D reconstruction of the reciprocal space for the inverse opal crystals with different thickness provided an indirect study of original opal templates in a depth-resolved way. The microstructure and thermal response of the framework of the porous inverse opal crystal was examined using wide-angle powder x-ray diffraction. This artificial porous structure is built from nickel crystallites possessing stacking faults and dislocations peculiar for the nickel thin films.

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Determination of the real structure of artificial and natural opals on the basis of three-dimensional reconstructions of reciprocal space

Cited by 20 publications

References 29 publications

Double hexagonal close-packed structure revealed in a single colloidal crystal grain by Bragg rod analysis

Double hexagonal close-packed structure revealed in a single colloidal crystal grain by Bragg rod analysis

Microwave properties of Ni-based ferromagnetic inverse opals

Periodic order and defects in Ni-based inverse opal-like crystals on the mesoscopic and atomic scale

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