We investigate the effect of mat.rial design and UV treatment on nanoscale (d = 50 nm) ovonic threshold switch (OTS) devices for selector-only memory (SOM) applications. By characterizing OTS devices with varying mat....
We investigate the effect of mat.rial design and UV treatment on nanoscale (d = 50 nm) ovonic threshold switch (OTS) devices for selector-only memory (SOM) applications. By characterizing OTS devices with varying mat.rial compositions, we identified selenium (Se) as a key element for SOM operation. The optimized OTS device exhibited a large memory window (MW > 1.2 V) with an ultra-fast write operation speed (~ 10 ns). Additionally, we demonstrate that interface eng.neering with proper UV treatment significantly improved device variability characteristics. UV-treated OTS devices demonstrated excellent retention (> 10 years at RT) and cycling endurance properties (> 10 8 cycles). Analysis of Raman and XPS spectra revealed that SOM properties were determined by the bonding nature associated with the Se element.
For the application of a high-density, low-cost 3D vertical X-point array (V-XPA), we report the characteristics of the atomic layer deposition (ALD) available simple In-Te binary ovonic threshold switch (OTS) and its...
For the application of a high-density, low-cost 3D vertical X-point array (V-XPA), we report the characteristics of the atomic layer deposition (ALD) available simple In-Te binary ovonic threshold switch (OTS) and its combination with an $\mat.rm{HfO}_{\mat.rm{x}}$ buffer layer. In-Te binary OTS exhibited a highly stable threshold voltage $(\mat.rm{V}_{\mat.rm{th}})$ and low delta firing voltage $(\Delta\mat.rm{V}_{\mat.rm{ff}}=\mat.rm{V}_{\mat.rm{ff}}-\mat.rm{V}_{\mat.rm{th}})$ with a low off-leakage current ($\mat.rm{I}_{\text{off}}$) of several nanoamperes, which are the essential requirements for a mega-array. To reduce the high $\mat.rm{I}_{\text{off}}$ of the V-XPA, which originates from the perimeter shape selector area, a sub-nanometer ultrathin $\mat.rm{HfO}_{\mat.rm{x}}$ buffer layer was successfully applied for the current confinement, yielding an excellent $\mat.rm{I}_{\text{off}}$ of 1 nA when combined with the In-Te binary OTS.
Due to its exceptional oxygen storage/release capabilities, excellent catalytic activity, and selectivity, the single-atom Pt1/CeO2 catalyst has demonstrated significant research prospects and development promise in f...
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In this paper, the mixed powder of 40%Zn+60%SAC0307 is used as the solder, and a new type of dual ultrasonic-assisted soldering process is used to successfully achieve the interconnection of copper and aluminum dissim...
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Aqueous solution of Benzoyl bromide (C6H5COBr), Sodium bromide (NaBr) and (BrOH) were used for treated the sawdust for 1 hr. Different weight ratios of sawdust (15, 25, and 35%) wt. were added to polypropylene and the...
Aqueous solution of Benzoyl bromide (C6H5COBr), Sodium bromide (NaBr) and (BrOH) were used for treated the sawdust for 1 hr. Different weight ratios of sawdust (15, 25, and 35%) wt. were added to polypropylene and the specimens were extruded under 260oC to prepare the composites samples as well as the pure polypropylene. Infrared spectroscopy (FTIR) was performed to study the structural properties of treated and untreated samples. Morphology of samples was investigated using optical microscopy. Impact streng.h was studded. Water absorption of treated sawdust composites and untreated sawdust composites also studied Results of Optical Microscopy results showed that the treated specimens have more homogeneous structure than untreated sawdust sample. Impact streng.h of composite samples improved via chemically treated sawdust and it also improved via increasing the sawdust ratio. Water absorption ratio of composite samples decreased via treated sawdust. Contact Angle of composite samples increased via treated sawdust.
The current work aims to study the mechanical properties of polypropylene /polyethylene blend (PP/PE) reinforced with treated sawdust composites. Benzoyl bromide aqueous solution and sodium bromide (NaBr) were used to...
The current work aims to study the mechanical properties of polypropylene /polyethylene blend (PP/PE) reinforced with treated sawdust composites. Benzoyl bromide aqueous solution and sodium bromide (NaBr) were used to treat the sawdust for 24 hr. Different weight ratios of sawdust (0,10,20,30 and 40) wt.%. were added to (PP/PE) blend and the specimens were extruded under 240oC to prepare the composite samples as well as the (PP/PE) blend. Infrared spectroscopy (FTIR) was used to study the structural properties of treated and untreated sawdust, as well as study the structure of (PP/PE) blend and its composites reinforced with sawdust. Flexural and impact streng.hs were studied. Thermal analysis via DSC device was also studied. Results showed that increasing the treated sawdust ratios from 0 to 40% wt. ed to increase in the values of impact streng.h, flexural streng.h and melting temperature of composite samples. Impact streng.h increased from 3kJ/cm2 for (PP/PE) unreinforced blend to 17 kJ/cm2 with 40%wt. of sawdust. Flexural streng.h increased from 8.9MPa for the unreinforced blend to 20 MPa of blend with 40 wt.% of sawdust.
It has long been thought that (111) surfaces of rock salt oxides microfacet to neutral surfaces upon annealing because of the very large energies involved in bulk terminating a layer of like ions. However in a recent ...
It has long been thought that (111) surfaces of rock salt oxides microfacet to neutral surfaces upon annealing because of the very large energies involved in bulk terminating a layer of like ions. However in a recent reflection electron microscopy (REM) study Gajdardziska-Josifovska et al. found that MgO(lll) surfaces annealed in flowing oxygen furnaces at 1500°C not only did not microfacet, but displayed a √3×√3R30° surface periodicity that was stable in air. To determine the structure of this unusually stable surface MgO (111) transmission electron microscopy (TEM) samples were annealed in a vacuum furnace in the present study and their transmission electron diffraction (TED) patterns were analyzed with direct phasing *** TEM samples were prepared by orienting a MgO single crystal and sawing lmm wafers along a (111) plane. Disk samples were then ultrasonically drilled, dimpled, mechanically polished and/or hot nitric acid etched, and milled with 5 KeV Ar+ ions.
During an HREM/AEM investigation, two different oxygen sinks were identified for a variety of SiC-ceramics involving different sintering mechanisms: segregation of oxygen to i) internal interfaces, and ii) “excess-ca...
During an HREM/AEM investigation, two different oxygen sinks were identified for a variety of SiC-ceramics involving different sintering mechanisms: segregation of oxygen to i) internal interfaces, and ii) “excess-carbon” secondary phases consisting of basically turbostratic graphite and an intermediate amorphous Si-C-O phase. Si-C-O glasses and polycarbosilane-based nonstoichiometric SiC mat.rials (Nicalon fibers) are well suited as model systems to evaluate the structure and the stability range of the amorphous Si-C-O phase in SiC-based ceramics.
In order to study the effect of Ri/T on welding residual stress in forging presses for Auto parts mat.rial, a welding experiment program was developed. The residual stress of thick pipe 10mm joint was measured by the ...
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