Discovery of face-centred cubic Os nanoparticles

2020 ◽  
Vol 56 (3) ◽  
pp. 372-374 ◽  
Author(s):  
Takuo Wakisaka ◽  
Kohei Kusada ◽  
Tomokazu Yamamoto ◽  
Takaaki Toriyama ◽  
Syo Matsumura ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Bulk State ◽  
Structure Control ◽  
Acetylacetonate Complex ◽  
Fcc Structure

The first example of the crystal structure control of Os is reported. The fcc-structured Os nanoparticles were synthesized using an Os acetylacetonate complex as a precursor although the fcc structure does not exist in the bulk state.

Crystal Structure Control of ZnxCd1−xS Alloyed Nanocrystals and Structural Dependent Fluorescence Properties

NANO ◽  
2019 ◽  
Vol 14 (08) ◽  
pp. 1950098
Author(s):  
Kaili Qin ◽  
Jingling Li ◽  
Yanqing Zhu ◽  
Xueqing Xu ◽  
Xiudi Xiao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Crystal Phase ◽  
Fluorescence Properties ◽  
Pure Zinc ◽  
Structure Control ◽  
Zinc Blende ◽  
Coating Method ◽  
Ratio Condition ◽  
One Step ◽  
Zinc Blende Structure

Crystal structure control is so important to the fluorescence properties that each element should be considered carefully. In conventional synthesis of ZnxCd[Formula: see text]S alloyed nanocrystals (NCs), most of studies focus on ligand–surface interaction on the formation of either zinc blende or wurtzite ZnxCd[Formula: see text]S nanocrystals, instead of the reactant source. In this work, mixed crystal phase was found easily in ZnxCd[Formula: see text]S alloyed NCs when reaction proceeded at high Zn/Cd source ratio condition. Therefore, we regulate the Zn/Cd ratio to obtain relative pure zinc-blende structure, and study the influence of structure change on the fluorescence properties. Further, we have proposed a two-step ZnS coating method to acquire ZnxCd[Formula: see text]S/ZnS NCs with separated crystal-phase between core and shell. Compared with maximum QY of 81% for ZnxCd[Formula: see text]S/ZnS NCs synthesized by conventional one-step coating method, the performance of the optimized NCs has significantly improved with maximum QY of 93%.

Crystal structure control in trace element partition between crystal and magma

1977 ◽  
Vol 100 (6) ◽  
pp. 315-324 ◽  
Author(s):  
Yoshito Matsui ◽  
Naoki Onuma ◽  
Hiroshi Nagasawa ◽  
Hideo Higuchi ◽  
Shohei Banno
Keyword(s):  
Crystal Structure ◽  
Trace Element ◽  
Structure Control

scholarly journals Crystal structure control of the dissolution of rare earth elements in water-mineral interactions

2006 ◽  
Vol 40 (5) ◽  
pp. 437-446 ◽  
Author(s):  
SHIN-NOSUKE SHIBATA ◽  
TSUYOSHI TANAKA ◽  
KOSHI YAMAMOTO
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Structure Control

Synthesis of Pt-TM(transition metals) Catalysts and Their Hydrogenation Ability of Methyl Acrylate

2009 ◽  
Vol 1217 ◽  
Author(s):  
Miki Amari ◽  
Satoshi Okada ◽  
Masahiko Demura ◽  
Keishi Nishio ◽  
Hirobumi Shibata ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity ◽  
Transition Metals ◽  
Methyl Acrylate ◽  
Crystalline Structures ◽  
Catalytic Activities ◽  
Fcc Structure

AbstractWe have prepared a number of Pt-TM(transition metals) alloys with various TM elements and evaluated their catalytic abilities by means of hydrogenation of methyl acrylate. High catalytic activities are obtained when the crystalline structures are similar, i.e., fcc structure, indicating that the crystal structure of a catalyst plays an important role in hydrogenation of methyl acrylate. Furthermore, for a certain TM element, i.e., Mo, the catalytic activity is found to surpass that of Pt metal.

Tailoring of Structural Morphology of Silver Nanowires in Electrochemical Growth

2007 ◽  
Vol 1058 ◽  
Author(s):  
Amrita Singh ◽  
Arindam Ghosh ◽  
Amrita Singh ◽  
Amrita Singh
Keyword(s):  
Crystal Structure ◽  
Silver Nanowires ◽  
Nitrate Solution ◽  
Critical Diameter ◽  
Metal Nanowires ◽  
Deposition Condition ◽  
Electrochemical Growth ◽  
Deposition Parameters ◽  
Hcp Structure ◽  
Fcc Structure

ABSTRACTNoble metal such as Ag normally exists in an fcc crystal structure. However as the size of the material is decreased to nanometer lengthscales, a structural transformation from that of its bulk state can be expected with new atomic arrangements due to competition between internal packing and minimization of surface energy. In many previous studies, it has been shown that silver nanowires (AGNWs) grown inside anodic alumina (AAO) templates by ac or dc electrochemical deposition from silver salts or complexes, adopt fcc structure and below some critical diameter ∼ 20 nm they may acquire hcp structure at low temperature. This is, however, critically dependant on the nature of confinement, as AgNWs grown inside nanotube confinement with subnanometer diameter have been reported to have fcc structure. Hence the question of the crystal structure of metal nanowires under combined influence of confinement, temperature and deposition condition remains open. In this abstract we show that the alternative crystal structures of AGNWs at room temperature can be achieved with electrochemical growth processes under specific conditions determined by the deposition parameters and nature of confinement. We fabricated AgNWs of 4H hexagonal structure with diameters 30 – 80 nm inside polycarbonate (PC) templates with a modified dc electrodeposition technique, where the nanowires were grown at deposition potentials as low as 10 mV in 2 M silver nitrate solution[1]. We call this low-potential electrodeposition (LPED) since the electrodeposition process occurs at potential much less than the standard Nernst potential (770 mV) of silver. Two types of electrodes were used – stainless steel and sputtered thin Pt film, neither of which had any influence on the crystal structure of the nanowires. EDS elemental analysis showed the nanowires to consist only of silver. Although the precise atomic dynamics during the LPED process is unclear at present, we investigated this with HRTEM (high-resolution transmission electron microscopy) characterization of nanowires grown over various deposition times, as well as electrical conductivity measurements. These experiments indicate that nanowire growth does not occur through a three-dimensional diffusion controlled process, as proposed for conventional over-potential deposition, but follow a novel instantaneous linear growth mechanism. Further experiments showed that, (a) conventional electrochemical growth at a small over-potential in a 2 mM AgNO3 solution yields nanowires with expected fcc structure inside the same PC templates, and (2) no nanowire was observed under the LPED conditions inside hard AAO templates, indicating that LPED-growth process, and hcp structure of the corresponding nanowires depend on deposition parameters, as well as nature of confinement.

Strengthen Mechanism of Hard-Drawn Cobalt-Base Elastic Alloy

2011 ◽  
Vol 399-401 ◽  
pp. 2255-2260
Author(s):  
Xiao Hui Zheng ◽  
Gui Min Liu ◽  
Jian Hua Du
Keyword(s):  
Crystal Structure ◽  
Plastic Deformation ◽  
Tensile Properties ◽  
Solution Treatment ◽  
Deformation Mode ◽  
Cobalt Base ◽  
Strengthen Mechanism ◽  
Fcc Structure ◽  
Main Deformation

The microstructure and tensile properties of cobalt-base elastic alloy Co40NiCrMo are investigated. The results show that, fcc structure is the crystal structure of Co40NiCrMo alloy after solution treatment and hard-draw. The slipping and twinning are the modes of plastic deformation during the hard-draw. Twinning is the main deformation mode of Co40NiCrMo alloy after hard-draw when more deformation is made.

Morphology and crystal structure control of GaAs nanowires grown by Au-assisted MBE with solid As4 source

2011 ◽  
Vol 324 (1) ◽  
pp. 82-87 ◽  
Author(s):  
X. Li ◽  
H. Guo ◽  
Z. Yin ◽  
T. Shi ◽  
L. Wen ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Control ◽  
Gaas Nanowires
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