Neutron small-angle scattering study of phase decomposition in Au–Pt

Singhal, S. P.; Herman, H.; Kostorz, G.

doi:10.1107/s0021889878013904

Cited by 32 publications

(7 citation statements)

References 5 publications

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“…Reproduced with permission. Spinodal decomposition has been studied in many materials systems, including Al-Zn, [80] Au-Pt, [81] Cu-Ti, [82] VO 2 -TiO 2 , [83] SiO 2 -TiO 2 , [83] SiO 2 -ZnO. C) Arrays of gold nanoparticles directed by lithographically confined DNA origami.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

“…[75][76][77][78][79] In this process, phase separation occurs through diffusion in the direction of increasing concentration due to the second derivative of the free energy with respect to composition having a negative sign. Spinodal decomposition has been studied in many materials systems, including Al-Zn, [80] Au-Pt, [81] Cu-Ti, [82] VO 2 -TiO 2 , [83] SiO 2 -TiO 2 , [83] SiO 2 -ZnO. [83] These material systems have a potential to exhibit unique optical properties arising from the combination of the two constituent phases.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

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Template‐Directed Solidification of Eutectic Optical Materials

Kulkarni

Kohanek

Tyler

et al. 2018

Advanced Optical Materials

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polarizers, some waveguides, and many lasers. [1][2][3] Materials with powerful optical functionalities, including negative-index of refraction and optical chirality, can be realized by appropriate placement of materials with suitable properties in 2D or 3D space. [4][5][6] Light in the visible spectrum can be manipulated, although the tolerance for defects is exceedingly low at visible frequencies, and the number of materials with the appropriate properties is limited. [7,8] Most photonic crystals are fabricated by high-resolution top-down 2D patterning methods such as electron-beam lithography, interference lithography, and focused ion beam milling. [9] However, it is challenging to fabricate large-area bulk materials with these techniques, especially with intricate internal structures. [8] Additionally, many materials with promising optical properties are not compatible with these top-down patterning methods. [4,10] As work on colloidal crystals has shown, controlled self-assembly is an effective route to organizing materials into 3D architectures, which interact strongly with light. [9][10][11][12][13] Colloidal self-assembly, however, only offers a limited set of symmetries (generally those of close packed arrangements), and a spherical basis. [12] For many applications, considerably more complex structures are of interest. Particularly promising approaches for forming materials with complex internal microstructures include eutectic solidification and block copolymer self-assembly, [14][15][16][17] and materials with interesting optical properties have been reported using both approaches. These methods are advantageous due to the wide range of microstructures they form. Here, we focus on the structures formed by eutectic solidification since materials with a broader range of optical properties are available compared to that provided by block copolymers, and because the characteristic lengths of structures accessible through eutectic solidification better match the wavelengths of visible and IR light. Further, forming materials with sufficiently large characteristic dimensions for interaction with visible light by block copolymer assembly is synthetically challenging as it requires high molecular weight polymers. [18] Similarly, self-assembly of other building blocks, e.g., nanoparticles, [19,20] molecules, [21,22] and DNA, [23,24] tend to produce structures with characteristic dimensions too small to provide strong light-matter interactions (via diffractive phenomena), [2,3,25] and are thus not the emphasis of this review.Mesostructured materials can exhibit enhanced light-matter interactions, which can become particularly strong when the characteristic dimensions of the structure are similar to or smaller than the wavelength of light. For controlling visible to near-infrared wavelengths, the small characteristic dimensions of the required structures usually demand fabrication by sophisticated lithographic techniques. However, these fabrication methods are restricted to producing 2D and a limited range of 3D...

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Section: Wwwadvopticalmatdementioning

confidence: 99%

Section: Wwwadvopticalmatdementioning

confidence: 99%

Template‐Directed Solidification of Eutectic Optical Materials

Kulkarni

Kohanek

Tyler

et al. 2018

Advanced Optical Materials

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“…In the Tokuyama, Enomoto & Kawasaki (1987); HF: ; FL: Fratzl & Lebowitz (1989). e: Pt-40 at.% Au (Singhal, Herman & Kostorz, 1978); t~: AI-5-3, -6.8 at.% Zn (Hennion, Ronzaud & Guyot, 1982); o: AI-6"8, -10 at.% Zn(Mg) (Komura, Osamura, Fuji & Takeda, 1985); V: A1-12-1 at.% Zn (Guyot & Simon, 1982); A: AI-22 at.% Zn(Mg) (Forouhi & de Fontaine, 1987); ~: Al-12, -22, -32 at.% Zn ; ~: AI-4, -6-8at.% Zn(Mg) (Komura, Takeda, Osamura, & Okuda, 1988); I1: Cu-33at.% Mn (Gaulin, Spooner & Morii, 1987); II': Fe-34 at.% Cr (Katano & Iizumi, 1984); A: A1-Li (see . two-phase model including interparticle interference, these authors determine a size-distribution function for spherical particles by fitting a linear combination of cubic splines to reproduce the scattering curves for Q> Qm (Magnani, Puliti & Stefanon, 1988).…”

Section: I(qt)/ I( T) = L 3( T)s[q L( T)t]mentioning

confidence: 99%

Small-angle scattering studies of phase separation and defects in inorganic materials

Kostorz¹

1991

J Appl Cryst

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The use of X-ray and neutron small-angle scattering in the study of microstructural changes in inorganic materials is reviewed, with emphasis on recent developments. In the kinetics of diffusion-controlled phase separation, reliable data on the evolution of size and shape of the decomposition products may be obtained especially from in situ ageing experiments. Magnetic neutron scattering is discussed for inhomogeneous ferromagnets. While for the structural characterization of binary systems singlewavelength experiments are sufficient, variable X-ray wavelengths now available at synchrotron-radiation facilities open possibilities for the study of partial structure functions in systems containing several components. The combined use of small-angle scattering and complementary techniques is of particular value in more complex cases. These points are illustrated by a survey of recent results on phase separation and precipitates in binary and ternary crystalline alloys and on radiation-induced microstructural changes in metallic and semiconducting materials.

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“…The observed width of the structure function in CuRh is even somewhat larger than that measured in a melt-spun AuPt alloy where the finite grain size inhibits the formation of a long range modulated structure. 18,25 Furthermore, satellite intensities near fundamental matrix reflections are likewise found in CuRh. The intensity distribution of the satellites is similar to the intensity distribution observed in the small-angle scattering experiment, i.e., the scaled intensity distributions obtained from the small-angle scattering experiment and from the satellite intensities can be represented by the same curve.…”

Section: Discussionmentioning

confidence: 80%

Structure functions in decomposing CuRh systems

1997

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The time evolution of a CuRh alloy quenched within the miscibility gap is investigated by small and wide angle neutron scattering techniques. Near fundamental Bragg reflections diffuse satellites arising from a lattice parameter modulation induced by the precipitation pattern are investigated. The results show that in CuRh the precipitation morphology and its time evolution are quite different from decomposition characteristics recently observed in the system AuPt. The results are discussed and related to the larger lattice misfit present in CuRh in comparison to AuPt. ͓S0163-1829͑97͒01405-7͔

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Neutron small-angle scattering study of phase decomposition in Au–Pt

Cited by 32 publications

References 5 publications

Template‐Directed Solidification of Eutectic Optical Materials

Template‐Directed Solidification of Eutectic Optical Materials

Small-angle scattering studies of phase separation and defects in inorganic materials

Structure functions in decomposing CuRh systems

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