Microstructure Map for Self-Organized Phase Separation during Film Deposition

Lu, Yong; Wang, Cuiping; Gao, Yipeng; Shi, Rongpei; Liu, Xingjun; Wang, Yunzhi

doi:10.1103/physrevlett.109.086101

Cited by 51 publications

(42 citation statements)

References 44 publications

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“…When the diffusion along the surface is dominant, the film tends to form cylinder or columnar structures perpendicular to the growth plane as diffusion is confined in the top layers, whereas the subsurface interdiffusion (diffusion normal to the surface (z-direction)) is negligible. Lu et al have developed a phase-field-model of SD in epitaxial films and established the relationship among morphologies of two-phase microstructure, alloy composition, and deposition rate with the aid of computer simulations [29]. According to their simulations results, the lateral composition modulation develops at a slower deposition rate relative to the phase separation process in the films which is also consistent with the simulation results reported in Ref.…”

Section: Resultssupporting

confidence: 73%

“…On the other hand, when the growth rate is higher, the composition variation occurs in the direction normal to the film plane. This phenomenon, called surface-directed spinodal decomposition (SDSD), generates the superlattice structure in the film after phase separation [17,29]. In our previous study, we reported the superlattice structure formation through SDSD in SrTiO 3 films grown by Dynamic Aurora PLD [17].…”

Section: Resultsmentioning

confidence: 99%

“…In our previous study, we reported the superlattice structure formation through SDSD in SrTiO 3 films grown by Dynamic Aurora PLD [17]. Here, the composition wave propagates in the vertical direction [17,28,29]. …”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic-field-induced phase separation via spinodal decomposition in epitaxial manganese ferrite thin films

Debnath

Kawaguchi

Das

et al. 2018

Science and Technology of Advanced Materials

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In this study, we report about the occurrence of phase separation through spinodal decomposition (SD) in spinel manganese ferrite (Mn ferrite) thin films grown by Dynamic Aurora pulsed laser deposition. The driving force behind this SD in Mn ferrite films is considered to be an ion-impingement-enhanced diffusion that is induced by the application of magnetic field during film growth. The phase separation to Mn-rich and Fe-rich phases in Mn ferrite films is confirmed from the Bragg’s peak splitting and the appearance of the patterned checkerboard-like domain in the surface. In the cross-sectional microstructure analysis, the distribution of Mn and Fe-signals alternately changes along the lateral (x and y) directions, while it is almost homogeneous in the z-direction. The result suggests that columnar-type phase separation occurs by the up-hill diffusion only along the in-plane directions. The propagation of a quasi-sinusoidal compositional wave in the lateral directions is confirmed from spatially resolved chemical composition analysis, which strongly demonstrates the occurrence of phase separation via SD. It is also found that the composition of Mn-rich and Fe-rich phases in phase-separated Mn ferrite thin films deposited at higher growth temperature and in situ magnetic field does not depend on the corresponding average film composition.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

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Magnetic-field-induced phase separation via spinodal decomposition in epitaxial manganese ferrite thin films

Debnath

Kawaguchi

Das

et al. 2018

Science and Technology of Advanced Materials

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“…A plan-view sample of the Mo-rich matrix exhibits a bicontinuous morphology as shown in Figure 3(d). This morphology is expected when the spinodal decomposition outruns the deposition process [20]. As a fresh layer is deposited, the existing layer has already decomposed, which serves as a template for the decomposition of the fresh layer, resulting in a structure as shown in Figure 3(e).…”

Section: Nanocomposite With Coarse-length-scale Bicontinuous Zonesmentioning

confidence: 99%

Suppression of shear banding in high-strength Cu/Mo nanocomposites with hierarchical bicontinuous intertwined structures

Cui

Derby

et al. 2018

Materials Research Letters

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The microstructures and mechanical behavior of high-temperature co-sputtered Cu/Mo nanocomposites were investigated and compared with Cu/Mo multilayers. The co-sputtered nanocomposites present hierarchical architectures with bicontinuous intertwined Cu/Mo phases, the feature size of which can be tuned from 35 to 3 nm by changing the deposition parameters. After indentation, shear bands were found in the multilayers but not in the hierarchical nanocomposites. In situ nanocompression tests in Transmission electron microscopy showed that the hierarchical nanocomposite containing fine-length-scale intertwined Cu/Mo phases has very high strength. The hierarchical structure is proposed to play an important role in suppressing shear band formation. IMPACT STATEMENTCu/Mo nanocomposites with novel hierarchical architecture containing bicontinuous intertwined structures were fabricated through co-sputtering. High strength and good deformability were achieved in the nanocomposites through in situ nanomechanical testing.

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“…6 and 20. Similar developments can be applied for various phenomena described by the phase field approach, such as various phase transformations (martensitic, 1,6,20 reconstructive, 21 and electromagnetic phase transformations, 22 melting-freezing, 7,23 amorphization), diffusive phase transformations described by Cahn-Hilliard theory (e.g., spinodal decomposition, segregation, separation, and precipitation), 24 twinning, 20,25 grain evolution, 26 dislocations, 27 fracture, 28 and interaction of defects (cracks and dislocations) and phase transformations. 29 Finally, the expression obtained for the surface stresses can be included in commercial multyphysics codes, like COSMOL, 30 instead of the current simplified expressions.…”

Section: Discussionmentioning

confidence: 99%

Interface stress for nonequilibrium microstructures in the phase field approach: Exact analytical results

Levitas

2013

Phys. Rev. B

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An exact expression for the temperature-dependent interface stress tensor (tension) and energy is derived within a phase field approach. The key problem, of which part of the thermal energy should contribute to the surface tension, is resolved with the help of an analytical solution for a nonequilibrium interface. Thus, for a propagating interface at any temperature, the interface stress tensor represents biaxial tension with magnitude equal to the temperature-dependent interface energy. Explicit expressions for the distributions of interface stresses are obtained for a nonequilibrium interface and a critical nucleus. The results obtained are applicable for various phase transformations (solid-solid, melting-solidification, sublimation, etc.) and structural changes (twinning, grain evolution), and can be generalized for anisotropic interface energy, for dislocations, fracture, and diffusive phase transformations described by Cahn-Hilliard theory. An exact expression for the temperature-dependent interface stress tensor (tension) and energy is derived within a phase field approach. The key problem, of which part of the thermal energy should contribute to the surface tension, is resolved with the help of an analytical solution for a nonequilibrium interface. Thus, for a propagating interface at any temperature, the interface stress tensor represents biaxial tension with magnitude equal to the temperature-dependent interface energy. Explicit expressions for the distributions of interface stresses are obtained for a nonequilibrium interface and a critical nucleus. The results obtained are applicable for various phase transformations (solid-solid, melting-solidification, sublimation, etc.) and structural changes (twinning, grain evolution), and can be generalized for anisotropic interface energy, for dislocations, fracture, and diffusive phase transformations described by Cahn-Hilliard theory.

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Microstructure Map for Self-Organized Phase Separation during Film Deposition

Cited by 51 publications

References 44 publications

Magnetic-field-induced phase separation via spinodal decomposition in epitaxial manganese ferrite thin films

Magnetic-field-induced phase separation via spinodal decomposition in epitaxial manganese ferrite thin films

Suppression of shear banding in high-strength Cu/Mo nanocomposites with hierarchical bicontinuous intertwined structures

Interface stress for nonequilibrium microstructures in the phase field approach: Exact analytical results

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