Diffuse scattering in random-stacking hexagonal close-packed crystals of colloidal hard spheres

Byelov, Dmytro V.; Hilhorst, Jan; Reinink, Anke B.G.M. Leferink op; Snigireva, I.; Snigirev, A.; Vaughan, Gavin; Portale, Giuseppe; Petukhov, Andrei V.

doi:10.1080/01411590903586452

Cited by 17 publications

(16 citation statements)

References 33 publications

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“…These features are characteristic for colloidal crystals with a RHCP structure, which is illustrated in Figure 3 b. [47,48,52] Colloidal spheres are known to self-organize into closepacked structures consisting of stacks of hexagonal closepacked planes. [51,52] Depending on the crystal orientation, the Ewald sphere can cross the Bragg rods at different Q-values.…”

Section: Angewandte Chemiementioning

confidence: 99%

“…Moreover, when an X-ray beam appears nearly parallel to the crystal planes, a piece of Bragg rod can become visible in the diffraction pattern as marked by the circle in Figure 3 a. [47,48,52] Colloidal spheres are known to self-organize into closepacked structures consisting of stacks of hexagonal closepacked planes. Periodic stacking of the planes in ABCABC or ABABAB sequences leads to the formation of FCC or hexagonal close-packed (HCP) structures, respectively.…”

Section: Angewandte Chemiementioning

confidence: 99%

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Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field

Pal

Malik

et al. 2014

Angew Chem Int Ed

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Manipulation of the self-assembly of magnetic colloidal particles by an externally applied magnetic field paves a way toward developing novel stimuli responsive photonic structures. Using microradian X-ray scattering technique we have investigated the different crystal structures exhibited by self-assembly of core-shell magnetite/silica nanoparticles. An external magnetic field was employed to tune the colloidal crystallization. We find that the equilibrium structure in absence of the field is random hexagonal close-packed (RHCP) one. External field drives the self-assembly toward a body-centered tetragonal (BCT) structure. Our findings are in good agreement with simulation results on the assembly of these particles.

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Section: Angewandte Chemiementioning

confidence: 99%

Section: Angewandte Chemiementioning

confidence: 99%

Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field

Pal

Malik

et al. 2014

Angew Chem Int Ed

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“…Consequently, the actual layer stacking could be nonperiodic and, in principle, random. A random-stacking hex close-packed (rhcp) structure was first introduced for hard-sphere colloids [36], and has since been the subject of literature discussions [37,38]. In general, when different stacking sequences become energetically degenerate, that is, the energy difference between any two such structures is ∼1-10 meV per atom, or ∼10-100 K, then any two adjacent layers can occur with equal probability in the resulting structure.…”

Section: -7mentioning

confidence: 99%

Ab initiophase diagram of iridium

Burakovsky

Cawkwell

et al. 2016

Phys. Rev. B

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The phase diagram of iridium is investigated using the Z methodology. The Z methodology is a technique for phase diagram studies that combines the direct Z method for the computation of melting curves and the inverse Z method for the calculation of solid-solid phase boundaries. In the direct Z method, the solid phases along the melting curve are determined by comparing the solid-liquid equilibrium boundaries of candidate crystal structures. The inverse Z method involves quenching the liquid into the most stable solid phase at various temperatures and pressures to locate a solid-solid boundary. Although excellent agreement with the available experimental data (to 65 GPa) is found for the equation of state (EOS) of Ir, it is the third-order Birch-Murnaghan EOS with B 0 = 5 rather than the more widely accepted B 0 = 4 that describes our ab initio data to higher pressure (P ). Our results suggest the existence of a random-stacking hexagonal close-packed structure of iridium at high P . We offer an explanation for the 14-layer hexagonal structure observed in experiments by Cerenius and Dubrovinsky.

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“…Moreover, when an X‐ray beam appears nearly parallel to the crystal planes, a piece of Bragg rod can become visible in the diffraction pattern as marked by the circle in Figure 3 a 47. 48, 52…”

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confidence: 99%

Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field

Pal

Malik

et al. 2014

Angewandte Chemie

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Manipulation of the self‐assembly of magnetic colloidal particles by an externally applied magnetic field paves a way toward developing novel stimuli responsive photonic structures. Using microradian X‐ray scattering technique we have investigated the different crystal structures exhibited by self‐assembly of core–shell magnetite/silica nanoparticles. An external magnetic field was employed to tune the colloidal crystallization. We find that the equilibrium structure in absence of the field is random hexagonal close‐packed (RHCP) one. External field drives the self‐assembly toward a body‐centered tetragonal (BCT) structure. Our findings are in good agreement with simulation results on the assembly of these particles.

show abstract

Diffuse scattering in random-stacking hexagonal close-packed crystals of colloidal hard spheres

Cited by 17 publications

References 33 publications

Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field

Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field

Ab initiophase diagram of iridium

Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field

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