The mechanism of memory and threshold switching in (GeTe4)100−x(As2Se3)x glasses

Pumlianmunga,; Venkatesh, R.; Gopal, E. S. R.; Ramesh, K.

doi:10.1016/j.jnoncrysol.2016.08.044

Cited by 18 publications

(4 citation statements)

References 45 publications

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“…The present reviews show that nanostructured particles are improving hydrogen storage capacity [18,19]. It is well established that achieving nanocrystalline structure is possible and easier through mechanical alloying than any other processing technique like melt quenching, Chemical Vapour Deposition, and Physical Vapour Deposition [20][21][22][23][24][25]. Nanocrystalline Mg 2 Ni intermetallic exhibit faster hydrogen absorption and desorption kinetics than microcrystalline Mg 2 Ni alloys.…”

Section: Introductionmentioning

confidence: 80%

Hydrogen storage properties of magnesium based alloys Mg₆₇Ni_(32-x)Nb₁Al_x (x = 1, 3, and 5) by using response surface methodology

Nivedhitha,

Umarfarooq,

Banapurmath

et al. 2024

Phys. Scr.

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Nano metals and hydrogen storage have attracted significant attention in recent years due to their numerous unique properties and wide range of applications. This study explores the synthesis of nanostructured Al and Nb-substituted Mg2Ni intermetallic compounds through high-energy ball milling and investigates their electrochemical performance for energy-related applications. The research emphasizes the critical influence of crystallinity and crystallite size on electrode material performance. Employing Response Surface Methodology (RSM), the study identifies key factors affecting discharge capacity. Notably, current density emerges as the most significant factor, contributing 73% to discharge capacity, as confirmed by perturbation plots. Interaction effects among the factors were found to be relatively insignificant concerning the chemical kinetics of the electrode material. Furthermore, a second-order polynomial equation was developed through RSM to quantitatively relate discharge capacity to composition, milling time, and current density, with a high R2 value of 98.3%. To optimize discharge capacity, a fuzzy parameter setting was generated based on the mathematical model, resulting in a predicted discharge capacity of 398.209 mAh g-1, closely aligned with actual experimental results (394.203 mAh g-1). This work showcases the significance of advanced statistical techniques in elucidating the intricate relationships governing electrochemical performance, particularly in the context of nanocrystalline materials.

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Section: Introductionmentioning

confidence: 80%

Hydrogen storage properties of magnesium based alloys Mg₆₇Ni_(32-x)Nb₁Al_x (x = 1, 3, and 5) by using response surface methodology

Nivedhitha,

Umarfarooq,

Banapurmath

et al. 2024

Phys. Scr.

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“…The increased conductivity in the ON state crystallizes the material. On reducing the current to zero, the I-V curve did not revert back to its initial high resistive amorphous state showing memory type switching behaviour [46,47].…”

Section: Current Versus Voltage Characteristicsmentioning

confidence: 97%

Reduction of write current with improved thermal stability in GeSe₂ doped Sb₂Te₃ films for phase change memory applications

Bhatt,

Parveen,

Whab

et al. 2024

J. Phys. D: Appl. Phys.

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Chalcogenide alloy-based semiconductors have gained significant attention in recent decades due to its applications in phase change memory (PCM). Sb2Te3 has proven to be an alternative to Static and Dynamic Random Access Memory and can be a suitable candidate for commercial memory devices due to their fast switching speed. However, Sb2Te3 suffers from low amorphous phase stability and high RESET current, which needs further improvement for high power efficiency. In this work, we have prepared (Sb2Te3)1−x (GeSe2) x (x = 0.06, 0.12, 0.18, 0.24, 0.3) films to investigate their PCM properties. The films showed a rise in transition temperature to transform from high resistive amorphous (RESET) to low resistive crystalline (SET) states with doping that leads to significant enhancement in amorphous phase stability. For 30% doping of GeSe2 in Sb2Te3, the data retention temperature increases from 20.2 °C to 84.6 °C, and the resistance contrast also increases from 102 to 105. The rise in electrical resistance with doping in the amorphous as well as crystalline states leads to a drop in threshold current (I th) from 3.5 to 0.8 mA. This also reduces the RESET and SET currents. By analyzing the samples using finite element method, it was found out that the high resistance materials produce more heat, resulting in a lower write current in an energy efficient PCM device.

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“…A recent article shows that nano-structured particles are promising candidates for storing hydrogen as it possesses superior surface properties to crystalline and amorphous particles RECEIVED [33]. Lots of scientific techniques are available for synthesizing crystalline, nanocrystalline, and amorphous materials such as sol-gel, hydrolysis, CVD, melt quenching, wet chemical method, Nebulizer spray technique, melt spinning, stir casting, combustion synthesis, mechanochemical activation, and high energy ball milling [34][35][36][37][38][39][40][41][42][43]. Among those techniques, High energy ball milling is one of the effective techniques for inducing fresh/ new surfaces with different types of defects on the surface of the powders with a particle size of less than 50 nm, which emphasizes the hydrogen ion diffusion kinetics [25,44,45].…”

Section: Introductionmentioning

confidence: 99%

Activation energy study on nanostructured niobium substituted Mg₂Ni intermetallic alloy for hydrogen storage application

K.S¹,

Venkatesh²,

Banapurmath³

2022

Phys. Scr.

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The magnesium-based metallic alloys have been exhibited to be the improved hydrogen storage materials. In the present investigation, a Nanostructured Mg67Ni33 and Niobium substituted intermetallic compound was prepared by a high-energy ball milling technique for hydrogen storage application. Niobium substitution on the pure crystalline intermetallic compound changed the structure of the crystalline to semi-amorphous as well as changed the interplanar spacing after 30 hours of milling. Furthermore, the effect of Nb substitution on the inter-planar shift and its corresponding implications on lattice strain, crystallite size, and unit cell volume of the Mg2Ni compound were also discussed. Transmission electron microscope studies confirm the particle size was reduced to less than 100 nm for 30 hours of milling. However, SEM images confirm the agglomeration of these nanoparticles and form spherical particles of size around 3-5 µm. XRD and EDS authenticate the presence of oxides. Kissinger’s analysis confirmed that Mg2Ni powder exhibited lower activation energy of 64.101 kJ/mol than niobium-substituted alloy powders. The hydrogen charge and discharge potential of these compounds are discussed in detail.

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The mechanism of memory and threshold switching in (GeTe4)100−x(As2Se3)x glasses

Cited by 18 publications

References 45 publications

Hydrogen storage properties of magnesium based alloys Mg₆₇Ni_(32-x)Nb₁Al_x (x = 1, 3, and 5) by using response surface methodology

Hydrogen storage properties of magnesium based alloys Mg₆₇Ni_(32-x)Nb₁Al_x (x = 1, 3, and 5) by using response surface methodology

Reduction of write current with improved thermal stability in GeSe₂ doped Sb₂Te₃ films for phase change memory applications

Activation energy study on nanostructured niobium substituted Mg₂Ni intermetallic alloy for hydrogen storage application

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The mechanism of memory and threshold switching in (GeTe4)100−x(As2Se3)x glasses

Cited by 18 publications

References 45 publications

Hydrogen storage properties of magnesium based alloys Mg67Ni(32-x)Nb1Alx (x = 1, 3, and 5) by using response surface methodology

Hydrogen storage properties of magnesium based alloys Mg67Ni(32-x)Nb1Alx (x = 1, 3, and 5) by using response surface methodology

Reduction of write current with improved thermal stability in GeSe2 doped Sb2Te3 films for phase change memory applications

Activation energy study on nanostructured niobium substituted Mg2Ni intermetallic alloy for hydrogen storage application

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Hydrogen storage properties of magnesium based alloys Mg₆₇Ni_(32-x)Nb₁Al_x (x = 1, 3, and 5) by using response surface methodology

Hydrogen storage properties of magnesium based alloys Mg₆₇Ni_(32-x)Nb₁Al_x (x = 1, 3, and 5) by using response surface methodology

Reduction of write current with improved thermal stability in GeSe₂ doped Sb₂Te₃ films for phase change memory applications

Activation energy study on nanostructured niobium substituted Mg₂Ni intermetallic alloy for hydrogen storage application