Self-Precipitated Process of Te Nanowire from Zr-Doped Sb2Te3 Film

2016 ◽  
Vol 848 ◽  
pp. 489-493
Author(s):  
Yong Hui Zheng ◽  
Yan Cheng ◽  
Zhi Tang Song ◽  
Wei Jun Yin ◽  
Min Zhu ◽  
...  

By using Zr6.5(Sb2Te3)93.5 film, Te nanowires with a diameter of 5 to 30 nm were fabricated through annealing process. The results of the bright field TEM images, selected area electron diffraction (SAED) and high resolution transmission electron microscopy (HRTEM) demonstrated that the nanowire fitted well with Te hexagonal Te (P3121) structure. The EDS mapping implies that Zr element bonded with Te element and induced the formation of single crystalline Te nanowire during the annealing process.

2011 ◽  
Vol 189-193 ◽  
pp. 1036-1039
Author(s):  
Jing Ling Ma ◽  
Jiu Ba Wen ◽  
Yan Fu Yan

The precipitates of Al-5Zn-0.02In-1Mg-0.05Ti-0.5Ce (wt %) anode alloy were studied by scanning electron microscopy, X-ray microanalysis, high resolution transmission electron microscopy and selected area electron diffraction analyses in the present work. The results show that the alloy mainly contains hexagonal structure MgZn2 and tetragonal structure Al2CeZn2 precipitates. From high resolution transmission electron microscopy and selected area electron diffraction, aluminium, Al2CeZn2 and MgZn2 phases have [0 1 -1]Al|| [1 -10]Al2CeZn2|| [-1 1 0 1]MgZn2orientation relation, and Al2CeZn2 and MgZn2 phases have the [0 2 -1]Al2CeZn2|| [0 1 -10]MgZn2orientation relation.


2005 ◽  
Vol 475-479 ◽  
pp. 3575-3578
Author(s):  
Zhi Zhong Dong ◽  
Haiyong Gao ◽  
Cheng Shan Xue ◽  
Zhi Hua Dong ◽  
Jian Ting He

Heagonal GaN nanorods have been synthesized through ammoniating ZnO/Ga2O3 films deposited by radio frequency(rf) magnetron sputtering on Si(111) substrates.X-ray diffraction(XRD), Fourier transform infrared spectrophotometer (FTIR), transimission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM) and selected-area electron diffraction (SAED) are used to analyze the structure,composition and morphology of the synthesized GaN nanorods. TEM result shows that GaN nanorods own bamboo-shaped morphalogy and have a single-crystal hexagonal wurtzite structure.The average length and dimeter of the nanorods are 3μm and 50 nm espectively.Ga2O3 and NH3 reactived directly and synthesized GaN nanorods without any catalyzer and the process of space-confined reactions.


2004 ◽  
Vol 03 (06) ◽  
pp. 891-896
Author(s):  
J. M. ZHU ◽  
S. S. HUANG ◽  
G. B. MA ◽  
X. H. ZHU ◽  
S. H. ZHOU ◽  
...  

Rutile TiO 2 nanorods have been successfully prepared by a sonochemical method. The microstructures of TiO 2 nanorods were investigated in detail by transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HREM). Probable mechanisms for the sonochemical formation of TiO 2 nanorods are proposed.


2000 ◽  
Vol 56 (5) ◽  
pp. 780-784 ◽  
Author(s):  
Franziska E. Rohrer ◽  
Ann-Kristin Larsson

N-Nb2O5 [C2/m (No. 12), a = 28.51, b = 3.830 and c = 17.48 Å, and β = 124.8°] has been investigated by means of selected-area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). N-Nb2O5 is domain twinned, with the twin plane perpendicular to the c* axis. The domains are rather small and the domain twinning can sometimes be best explained as stacking faults. A second type of coherent twinning at an angle of 90° to the other two domain directions was also found. These domains are linked together by areas containing blocks of different sizes, similar to the disordered block arrangement observed in M-Nb2O5.


1988 ◽  
Vol 234 (1277) ◽  
pp. 441-453 ◽  

Electron diffraction and high-resolution transmission electron microscopy indicate that the radial segments composing coccoliths of the marine alga Emiliania huxleyi are individual single crystalline units of calcite. The top and bottom surfaces of the plate-like lower element correspond to the (12̄10) and (1̄21̄0) faces, and the [0001] direction ( c axis) is oriented parallel to these faces and in the direction of elongation of the lower and upper elements. The [101̄0] direction is perpendicular to the direction of elongation and corresponds to the direction of growth of the hammer-head extension in the upper element. Each radial segment exhibits handedness when viewed from above. The peripheral edges of the lower element are truncated by (101̄4) and (1̄018) rhombohedral faces with the (1̄018) face being more extensively developed and always positioned to the left when viewed from above, indicating the specific growth of the (1̄21̄0) face on the surface of the underlying base plate. Energy-dispersive X-ray analysis (EDXA) showed no evidence for localized compositional changes in the coccolith components. A mechanism is proposed in which the biological control of the development of individual radial segments is determined by the initial orientation of calcite rhombohedra with the (1̄21̄0) face parallel to the organic base plate, followed by vectorial regulation of crystal growth in three dimensions through the spatial restrictions set by the developing ultrastructure of the surrounding coc­colith vesicle membrane. The geometric, stereochemical and symmetry requirements of molecular interactions between ions in the (1̄21̄0) face and macromolecules in the polysaccharide-containing base plate are dis­cussed.


2009 ◽  
Vol 24 (1) ◽  
pp. 192-197 ◽  
Author(s):  
G.M. Cheng ◽  
Y.X. Tian ◽  
L.L. He

The orientation relationship (OR) and the interfacial structure between Nb solid solution (Nbss) precipitates and α-Nb5Si3 intermetallics have been investigated by transmission electron microscopy (TEM). The OR between Nbss and α-Nb5Si3 was determined by selected-area electron diffraction analyses as (222)Nb//(002)α and . High-resolution TEM images of the Nbss/α-Nb5Si3 interface were presented. Steps existed at the interface that acted as centers of stress concentration and released the distortion of lattices to decrease the interfacial energy. In addition, the interfacial models were proposed based on the observed OR to describe the atomic matching of the interface. The distribution of alloying elements at the Nbss/α-Nb5Si3 interface has also been investigated, and Hf was enriched at the interface to strengthen the grain boundary.


1998 ◽  
Vol 553 ◽  
Author(s):  
C. Reich ◽  
M. Conrad ◽  
F. Krumeich ◽  
B. Harbrecht

AbstractThe dodecagonal (dd) quasicrystalline tantalum telluride dd Ta1.6Te and the crystalline approximant Ta97Te60 have been modified by partly replacing tantalum by vanadium. The impact of the substitution on the structures has been studied by X-ray and electron diffraction and by high-resolution transmission electron microscopy. The layered-type approximant structure of Ta83V14Te60 was determined by single crystal X-ray means. The partitioning of vanadium on 21 out of 29 crystallographically inequivalent metal sites is referred to, but not controlled by the Dirichlet domain volume available at the sites. A HRTEM projection of dd (Ta, V)1.6Te onto the dodecagonal plane is analysed with respect to the arrangement of (Ta, V)151Te74 clusters on the vertices of an irregular aperiodic square-triangle tiling, the edge length of which corresponds to the distance between the centres of two such clusters. The clusters comprise about 1 nm thick corrugated lamellae which are periodically stacked by weak Te-Te interactions.


2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Wenqing Qin ◽  
Congren Yang ◽  
Ran Yi ◽  
Guanhua Gao

Single-crystalline - nanocubes were successfully obtained in large quantities through a facile one-step hydrothermal synthetic route under mild conditions. In this synthetic system, aqueous iron (III) nitrate () served as iron source and triethylamine served as precipitant and alkaline agent. By prolonging reaction time from 1 h to 24 h, the evolution process of -, from nanorhombohedra to nanohexahedron, and finally nanocube, was observed. The products were characterized by Powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), High-resolution Transmission Electron Microscopy (HRTEM), Selected-Area Electron Diffraction (SAED), and Fourier Transform Infrared Spectrometry (FTIR). The possible formation mechanism was discussed on basis of the experimental results.


2018 ◽  
Vol 90 (5) ◽  
pp. 833-844
Author(s):  
Leonid Aslanov ◽  
Valery Zakharov ◽  
Ksenia Paseshnichenko ◽  
Aleksandr Yatsenko ◽  
Andrey Orekhov ◽  
...  

AbstractA new method for synthesis of 2D nanocrystals in water was proposed. The use of perfluorothiophenolate ions as surfactant allowed us to produce 2D single-crystal nanosheets of CaS at pH=9 and flat nanocrystals of PbS at pH=9 at room temperature. Mesocrystalline nanobelts of CdS and mesocrystals of PbS were obtained at pH=3–5 and pH=10–12, respectively. Morphology, structure and chemical composition of nanoparticles were characterized by high-resolution transmission electron microscopy, electron diffraction and energy dispersive X-ray spectroscopy. A mechanism of nanoparticles formation was discussed.


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