Ultra-large single crystals by abnormal grain growth

Kusama, Tomoe; Omori, Toshihiro; Saito, Takashi; Kise, Sumio; Tanaka, Toyonobu; Araki, Yoshikazu; Kainuma, Ryosuke

doi:10.1038/s41467-017-00383-0

Cited by 161 publications

(88 citation statements)

References 40 publications

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“…Recently, solution‐based fabrication processes for high‐quality 2D nanostructures guided by the mechanisms of nucleation site control, epitaxial growth, and grain‐rotation‐induced coalescence have been reported as promising techniques without the needs of sophisticated equipment. By controlling their growth conditions, including chemical concentration, temperature, and solvent property, 2D metal or semimetal nanostructures can be well grown on the substrates . However, dislocations, disinclinations, and symmetry‐breaking instabilities can frequently prompt the formations of defects and grain boundaries in the synthesis processes and crystal growth rate of the 2D nanostructure is very slow …”

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confidence: 99%

Ultrafast Growth of Large 2D Silver Nanosheets by Highly Ordered Biological Template at Air/Gel Interface

Jang

Seong

Zang

et al. 2018

Adv Materials Inter

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However, dislocations, disinclinations, and symmetry-breaking instabilities can frequently prompt the formations of defects and grain boundaries in the synthesis processes [15,16] and crystal growth rate of the 2D nanostructure is very slow. [17,18] In nature system, organic-inorganic hybrid nanostructures with high-crystallinity and diverse morphologies can be constructed by biomineralization process. [19,20] This natural process can efficiently induce the molecular rearrangement for high complexity [21] and many functionalities. [22,23] Therefore, these unique biological phenomena have been applied in synthesis method to control the crystallinity and morphology of 2D nanostructures with superior material properties. Here, we show a solution-based ultrafast 2D growth method for large-scale and high-quality silver nanosheets on air/gel interface. The biological hydrogel polymer forms a multilayered structure by a solvent-induced phase separation process at air/gel interface with trapped silver (Ag) salts between the layers. [24] Furthermore, the trapped Ag salts between each biological hydrogel layers can efficiently reduce into large-scale 2D Ag nanosheets during the annealing process.The mixture of the Ag salts and hydrogel solution is a transparent, light yellow color at room temperature with reduced viscosity as compared with pure gelatin solution (Figure S1a, Supporting Information), while its nominal phase-change temperature is 154 °C based on the thermal gravimetric analysis (TGA) analysis results ( Figure S1b, Supporting Information). The viscosity of the hydrogel mixture decreases further at above 40 °C as the hydrogen bond in the triple-helix gelatin chain [25] degrades by the intercalation of Ag ions between various functional side chains (e.g., amine, carboxyl, hydroxyl, and thiolate groups). [26] Adding methyl alcohol and Ag salts in the solution can partially neutralize and condense the hydrogel polymer chains [24,27] to form large and continuous multilayer membranes via the salting-out effect ( Figure S2, Supporting Information). Conceptually, Ag ions are coordinated on the randomly coiled gelatin chains, which are rapidly accumulated under elevated temperature to form a multi layered structure (Figure 1a). [28] The neutralization and condensation process occurs, and the Ag ions are trapped between the layers of the hydrogel scaffold (Figure 1b). A reducing agent, dopamine, is used to promote the conversion of Ag ions to atoms while large, multilayered gelatin scaffolds constrain the crystallization process laterally to increase the The growth of large and high-quality 2D nanomaterials is challenging due to the formation of defects from dislocations, disinclinations, and symmetrybreaking instabilities. In this study it is demonstrated that biological template can be utilized to align the molecular orientation for large grain size in the synthesis of the high-quality 2D silver nanostructure. The solvent assisted multilayering phenomenon of hydrogel forms biological template at the air/ gel interface...

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confidence: 99%

Ultrafast Growth of Large 2D Silver Nanosheets by Highly Ordered Biological Template at Air/Gel Interface

Jang

Seong

Zang

et al. 2018

Adv Materials Inter

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“…Abnormal grain growth (AGG) can be exploited to obtain a bamboo structure or even a single crystal. It has been reported that abnormal grain growth occurs by cyclic heat treatment between the single-phase region and two-phase region in Cu-Al-Mn SMAs [71] and this simple technique has been successfully applied to obtain a large singlecrystal Cu-Al-Mn [72]. Fortunately, the Fe-Mn-Al-Ni alloy also shows the a single-phase at high temperatures and a ?…”

Section: Abnormal Grain Growthmentioning

confidence: 99%

“…Two grains are abnormally growing, and smaller grains are seen inside the surrounding grains although they exist only in a part of the abnormal grains. The smaller grains are subgrains associated with precipitation of the c phase and the sub-boundary energy is a dominant driving pressure in this AGG phenomenon [72,73].…”

Section: Abnormal Grain Growthmentioning

confidence: 99%

Martensitic Transformation and Superelasticity in Fe–Mn–Al-Based Shape Memory Alloys

Omori

Kainuma

2017

Shap. Mem. Superelasticity

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Ferrous shape memory alloys showing superelasticity have recently been obtained in two alloy systems in the 2010s. One is Fe-Mn-Al-Ni, which undergoes martensitic transformation (MT) between the a (bcc) parent and c 0 (fcc) martensite phases. This MT can be thermodynamically understood by considering the magnetic contribution to the Gibbs energy, and the b-NiAl (B2) nanoprecipitates play an important role in the thermoelastic MT. The temperature dependence of critical stress for the MT is very small (about 0.5 MPa/°C) due to the small entropy difference between the parent and martensite phases in the Fe-Mn-Al-Ni alloy, and consequently, superelasticity can be obtained in a wide temperature range from cryogenic temperature to about 200°C. Microstructural control is of great importance for obtaining superelasticity, and the relative grain size is among the most crucial factors.

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“…1,2 Controlled abnormal grain growth at one or several sites in the polycrystalline sample at high temperatures is also a promising methodology to grow large-sized single crystals. [3][4][5] Further, the polycrystalline to single crystal growth can be achieved without passing the material through a melting stage denoted as solid-state crystal conversion. 6 Though these methods are highly sophisticated and produce good quality single crystal materials, they are time consuming.…”

Section: Introductionmentioning

confidence: 99%

Polycrystalline to preferred-(100) single crystal texture phase transformation of yttrium iron garnet nanoparticles

et al. 2019

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Nanocrystalline Ce-substituted yttrium iron garnet (YIG) powders of different compositions, Y 3Àx Ce x Fe 5 O 12 (0 # x # 2.0), were synthesized by a combination of sol-gel auto-combustion and solid-state synthesis techniques. The as-obtained powder samples were sintered at 1150 C for 10 h. The garnet structure formation is confirmed by the X-ray diffraction pattern, which shows that the calculated lattice parameter increased for x ¼ 1.0 and shows a decreasing trend for x $ 1.0 with the addition of cerium ions. The lattice parameter increased from 12.38Å to 12.41Å for x # 1.0 whereas it decreased from 12.412Å to 12.405Å with the cerium composition for x > 1.0. The average particle size determined by high resolution transmission electron microscopy is in the range of 50 to 90 nm and found to increase with the substitution of cerium ions in YIG. The room temperature magnetic parameters such as saturation magnetization, coercivity and remanence magnetization are greatly affected by the substitution of cerium ions. The values of saturation magnetization decrease from 25.5 to 15 emu g À1 whereas coercivity increases from 1 to 28 Oe with the substitution of cerium ions. The pure YIG sample shows polycrystalline nature that changed towards a single-crystal structure leading to a preferred-(100) orientation with the Ce substitution. The change from a ring to a spotty pattern observed in SAED confirmed the crystalline phase transformation and is well supported by HRTEM and magnetic measurements. The behavior of magnetic and electrical properties is well supported by the poly-and single-crystalline nature of YIG and Ce-YIG, respectively. The crystal structure transformation in YIG brought about by Ce substitution could unveil enormous opportunities in the preparation of singlecrystal materials from their polycrystalline counterparts.

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Ultra-large single crystals by abnormal grain growth

Cited by 161 publications

References 40 publications

Ultrafast Growth of Large 2D Silver Nanosheets by Highly Ordered Biological Template at Air/Gel Interface

Ultrafast Growth of Large 2D Silver Nanosheets by Highly Ordered Biological Template at Air/Gel Interface

Martensitic Transformation and Superelasticity in Fe–Mn–Al-Based Shape Memory Alloys

Polycrystalline to preferred-(100) single crystal texture phase transformation of yttrium iron garnet nanoparticles

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