scholarly journals Strong photoluminescence and sensing performance of nanosized Ca0.8Ln0.1Na0.1WO4(Ln = Sm,Eu) compounds obtained by the dry “top-down” grinding method

2019 ◽  
Vol 48 (32) ◽  
pp. 12080-12087 ◽  
Author(s):  
Germán E. Gomez ◽  
Carlos A. López ◽  
R. Lee Ayscue ◽  
Karah E. Knope ◽  
María del R. Torres Deluigi ◽  
...  
Keyword(s):  
Solid State ◽  
High Energy ◽  
Photoluminescence Properties ◽  
Top Down ◽  
High Energy Milling ◽  
Sensing Applications ◽  
Grinding Method ◽  
Doped Materials ◽  
Sensing Performance

Two new nanosized lanthanide-doped materials (Sm and Eu) obtained by high-energy milling provided a suitable platform with solid-state photoluminescence properties for sensing applications.

scholarly journals Optothermotronic effect as an ultrasensitive thermal sensing technology for solid-state electronics

2020 ◽  
Vol 6 (22) ◽  
pp. eaay2671 ◽  
Author(s):  
T. Dinh ◽  
T. Nguyen ◽  
A. R. M. Foisal ◽  
H.-P. Phan ◽  
T.-K. Nguyen ◽  
...  
Keyword(s):  
Solid State ◽  
High Performance ◽  
Charge Carriers ◽  
Thermal Excitation ◽  
Light Illumination ◽  
Solid State Electronics ◽  
Sensing Applications ◽  
Sensing Technology ◽  
Thermal Sensing ◽  
Sensing Performance

The thermal excitation, regulation, and detection of charge carriers in solid-state electronics have attracted great attention toward high-performance sensing applications but still face major challenges. Manipulating thermal excitation and transport of charge carriers in nanoheterostructures, we report a giant temperature sensing effect in semiconductor nanofilms via optoelectronic coupling, termed optothermotronics. A gradient of charge carriers in the nanofilms under nonuniform light illumination is coupled with an electric tuning current to enhance the performance of the thermal sensing effect. As a proof of concept, we used silicon carbide (SiC) nanofilms that form nanoheterostructures on silicon (Si). The sensing performance based on the thermal excitation of charge carriers in SiC is enhanced by at least 100 times through photon excitation, with a giant temperature coefficient of resistance (TCR) of up to −50%/K. Our findings could be used to substantially enhance the thermal sensing performance of solid-state electronics beyond the present sensing technologies.

Solid state sintering of a W–25wt% Ag powder prepared by high energy milling

2008 ◽  
Vol 26 (4) ◽  
pp. 318-323 ◽  
Author(s):  
F.A. da Costa ◽  
A.G.P. da Silva ◽  
F. Ambrozio Filho ◽  
U.U. Gomes
Keyword(s):  
Solid State ◽  
High Energy ◽  
High Energy Milling ◽  
Solid State Sintering

Preparation of La0.7Sr0.3Co0.2Fe0.8O3-δ (LSCF 7328) by Combination of Mechanochemical and Solid State Reaction

2017 ◽  
Vol 744 ◽  
pp. 399-403 ◽  
Author(s):  
Silvana Dwi Nurherdiana ◽  
Nikmatin Sholichah ◽  
Rendy Muhamad Iqbal ◽  
Mutya Sandei Sahasrikirana ◽  
Wahyu Prasetyo Utomo ◽  
...  
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Milling Time ◽  
High Energy ◽  
Milling Process ◽  
Perovskite Oxide ◽  
Combination Method ◽  
Structure Evolution ◽  
Preparation Methods ◽  
Grinding Method

Structure evolution and morphology of La0.7Sr0.3Co0.8Fe0.2O3-δ (LSCF 7328) were investigated during two different preparation methods namely mechanochemical and combination of mechanochemical-solid state. The result shows that no characteristic peak of perovskite oxide was found on the diffractogram of the product of sole mechanochemical method at 600 rpm and up to 12 h of high energy milling process. On the other hand, the manual grinding method that was followed by solid state calcination produces irregular particle size. Due to the result, the combination of both methods was proposed to obtain the fine structure formation and particle size distribution. Rietveld refinement was used to investigate the lattice distortion. It was found that unit cell remains unchanged at increasing milling time. Moreover, the combination method produces regular particle size at milling time of 0.5 h. At longer milling time, the more regular particle size is formed which comes from highly energy transfer of milling.

scholarly journals Characterization of phase changes during fabrication of copper alloys, crystalline and non-crystalline, prepared by mechanical alloying

2016 ◽  
Vol 36 (3) ◽  
pp. 102 ◽  
Author(s):  
Paula Rojas ◽  
Carola Martínez ◽  
Claudio Aguilar ◽  
Francisco Briones ◽  
María Eugenia Zelaya ◽  
...  
Keyword(s):  
Solid Solution ◽  
Solid State ◽  
Mechanical Alloying ◽  
Binary Systems ◽  
Copper Alloys ◽  
High Energy ◽  
Phase Changes ◽  
Mathematical Methods ◽  
High Energy Milling ◽  
Pure Metals

The manufacture of alloys in solid state has many differences with the conventional melting (casting) process. In the case of high energy milling or mechanical alloying, phase transformations of the raw materials are promoted by a large amount of energy that is introduced by impact with the grinding medium; there is no melting, but the microstructural changes go from microstructural refinement to amorphization in solid state. This work studies the behavior of pure metals (Cu and Ni), and different binary alloys (Cu-Ni and Cu-Zr), under the same milling/mechanical alloying conditions. After high-energy milling, X ray diffraction (XRD) patterns were analyzed to determine changes in the lattice parameter and find both microstrain and crystallite sizes, which were first calculated using the Williamson-Hall (W-H) method and then compared with the transmission electron microscope (TEM) images. Calculations showed a relatively appropriate approach to observations with TEM; however, in general, TEM observations detect heterogeneities, which are not considered for the W-H method. As for results, in the set of pure metals, we show that pure nickel undergoes more microstrain deformations, and is more abrasive than copper (and copper alloys). In binary systems, there was a complete solid solution in the Cu-Ni system and a glass-forming ability for the Cu-Zr, as a function of the Zr content. Mathematical methods cannot be applied when the systems have amorphization because there are no equations representing this process during milling. A general conclusion suggests that, under the same milling conditions, results are very different due to the significant impact of the composition: nickel easily forms a solid solution, while with a higher zirconium content there is a higher degree of glassforming ability.

Solid-state reactions during high-energy milling of mixed powders

2013 ◽  
Vol 61 (1) ◽  
pp. 310-320 ◽  
Author(s):  
Johannes Trapp ◽  
Bernd Kieback
Keyword(s):  
Solid State ◽  
High Energy ◽  
Solid State Reactions ◽  
High Energy Milling
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