Development of Cramics Nano-structures with Liquid Phase Crystal Growth

An Al–Cu–Fe partial phase diagram involving the icosahedral quasicrystal has been constructed along an Al62.5Cu37.5−xFex (x = 2.5 to 25 at.%) isopleth. The icosahedral quasicrystal forms at 850 °C via a peritectic reaction between a liquid and (Al,Cu) 13Fe4 phase and coexists with a liquid phase at temperature below the peritectic reaction. The icosahedral quasicrystal crystallizes as a primary phase in the temperature range of 760 to 850 °C from alloys surrounded by composition points of Al–Cu–Fe: 62.5–33–4.5, 62.5–34.5–3, 57.5–39.5–3 and 57.5–38.0–4.5 at.%. On the basis of the phase diagram, single grains of the Al–Cu–Fe icosahedral quasicrystal with a maximum size of 5 mm were successfully grown from Al–Cu–Fe melts.

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Micro-Structures Produced by Crystal Growth from Located Nuclei and Their Transfer Aiming at Functional Surfaces

Journal of Manufacturing and Materials Processing ◽

10.3390/jmmp4040105 ◽

2020 ◽

Vol 4 (4) ◽

pp. 105

Author(s):

Nobuyuki Moronuki ◽

Renato Serizawa

Keyword(s):

Crystal Growth ◽

Nanorod Array ◽

Industrial Applications ◽

Regular Structures ◽

Tio2 Nanorod Array ◽

Nano Structures ◽

Hydrothermal Processes ◽

Oxide Substrate ◽

Vertically Aligned ◽

Micro Structures

Hydrothermal processes can produce regular micro-/nano-structures easily; but their placement or position is difficult to control, and the obtainable structures tend to be random. For controlling the crystal growth, two types of definite and regular structures were obtained. The first ones were ZnO urchin-like structures synthesized from located ZnO particles as the nuclei. These structures were found to work as gas sensors utilizing a wide surface area. The second one was a vertically aligned TiO2 nanorod array synthesized on a fluorine-doped tin oxide substrate that has a similar lattice constant to rutile TiO2. Super-hydrophobicity after ultraviolet irradiation was then examined. Finally, the synthesized TiO2 array was peeled off and transferred onto a resin sheet. We determined that the substrate could be subjected to repeated hydrothermal synthesis, thereby demonstrating the reusability of the substrate. These results demonstrate the applicability of these processes for industrial applications.

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Mass Spectrometric Studies of Vapor-Phase Crystal Growth

Journal of The Electrochemical Society ◽

10.1149/1.2404322 ◽

1972 ◽

Vol 119 (6) ◽

pp. 761 ◽

Cited By ~ 124

Author(s):

Vladimir S. Ban

Keyword(s):

Crystal Growth ◽

Vapor Phase ◽

Mass Spectrometric ◽

Phase Crystal

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7509. Molecular dynamics simulations of low-energy particle bombardment effects during vapor-phase crystal growth: 10 eV Si atoms incident on Si(001)2 × 1 surfaces

Vacuum ◽

10.1016/0042-207x(91)91577-b ◽

1991 ◽

Vol 42 (10-11) ◽

pp. 675

Keyword(s):

Molecular Dynamics ◽

Crystal Growth ◽

Molecular Dynamics Simulations ◽

Vapor Phase ◽

Particle Bombardment ◽

Low Energy ◽

Energy Particle ◽

Phase Crystal ◽

Dynamics Simulations

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Characteristic Modification of Catalysts by Use of a Chloride Source

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.247.106 ◽

2016 ◽

Vol 247 ◽

pp. 106-110

Author(s):

Xiang Meng ◽

Hiroaki Suzuki ◽

Kenta Sasaki ◽

Hirokazu Tatsuoka

Keyword(s):

Liquid Phase ◽

Structural Control ◽

Crystal Nucleation ◽

Si Nanowires ◽

Vapor Liquid Solid ◽

Vapor Liquid Solid Mechanism ◽

Phase Crystal ◽

Morphological Modification ◽

Growth Evolution ◽

Modification Of Catalysts

Structural control and morphological modification of a series of Si-based nanostructures were studied from the viewpoint of modifying the catalyst’s characteristics. The catalyst was modified from a liquid to a solid during its growth. The growth evolution of the faceted Si nanowires occurred via a vapor–liquid–solid mechanism followed by a silicide vapor–solid–solid mechanism. The shapes of the catalysts defined the shapes of the nanowires during the vapor–solid–solid growth. The catalyst was further modified by the deposition of MnCl2. Only irregularly shaped Si particles or MnCl2 particles were observed on top of the Si nanowires. The characteristic modification of catalysts by liquid-phase crystal nucleation and deposition of liquid-phase droplets was discussed. In addition, the synthesis of a CrSi2 nanowire bundle by the formation of dense nanoparticles was studied.

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