Structural, vibrational and optical studies on an amorphous Se<sub>90</sub>P<sub>10</sub>alloy produced by mechanical alloying

Oliveira, Elaine Cristina Vieira de; Deflon, E.; Machado, K.D.; Silva, T G; Mangrich, A. S.

doi:10.1088/0953-8984/24/11/115802

Cited by 7 publications

(4 citation statements)

References 34 publications

(66 reference statements)

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“…Some structural data obtained from the cumulant analysis are seen in table 1. The average coordination numbers for Se-Se and Se-Te pairs are similar to those found for alloys with similar stoichiometries, such as Se 90 S 10 [62,13] and Se 90 P 10 [63,64]. They also agree with the values obtained by Itoh et al [65] and Majid et al [47] for similar compositions.…”

Section: Resultssupporting

confidence: 89%

Structural investigations on an amorphous Se₉₀Te₁₀alloy produced by mechanical alloying using EXAFS, cumulant expansion and RMC simulations

Kostrzepa

Siqueira

Machado

et al. 2012

J. Phys.: Condens. Matter

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We investigated an amorphous Se(90)Te(10) alloy produced by mechanical alloying using two different approaches. First, we used extended x-ray absorption fine structure (EXAFS) spectroscopy and the cumulant expansion method using the Einstein model for the temperature dependence of the cumulants to obtain the cumulants C(*)(1), C(*)(2), and C(*)(3). From these, we found information about the structure of the alloy as well as the thermal and structural disorder, anharmonicity of the effective interatomic pair potentials, thermal expansion of the Se-Se and Se-Te bonds and asymmetry of the partial distribution functions g(Se-Se)(r) and g(Se-Te)(r). The cumulants C(*)(1), C(*)(2), and C(*)(3) also allowed us to reconstruct the g(EXAFS)(ij)(r,T) functions from EXAFS. Then, we made reverse Monte Carlo (RMC) simulations using the total structure factor S(K) obtained from synchrotron x-ray diffraction and the EXAFS oscillations χ(k) on the Se K edge as input data to obtain the g(RMC)(ij)(r) functions. Both methods furnished very similar g(ij)(r) functions, and the structural data obtained from them were also very similar. The results obtained from both methods showed the presence of Se-Te pairs indicating that there is alloying at the atomic level. In addition, we could not find any evidence of the presence of Te clusters in the alloy.

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Section: Resultssupporting

confidence: 89%

Structural investigations on an amorphous Se₉₀Te₁₀alloy produced by mechanical alloying using EXAFS, cumulant expansion and RMC simulations

Kostrzepa

Siqueira

Machado

et al. 2012

J. Phys.: Condens. Matter

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“…However, the weak Raman peak around 130 cm –1 is assigned to the characteristic Ag–Se bond in β-Ag 2 Se . Meanwhile, the broad peak observed at 247 cm –1 is due to the Se–Se vibration modes …”

Section: Resultsmentioning

confidence: 97%

“…37 Meanwhile, the broad peak observed at 247 cm −1 is due to the Se−Se vibration modes. 38 The morphological characteristics of Ag 2 Se nanorod arrays and thin films were studied by FESEM. The cross-sectional FESEM images of the Ag 2 Se nanorod arrays and thin films are shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Ag₂Se Nanorod Arrays with Ultrahigh Room Temperature Thermoelectric Performance and Superior Mechanical Properties

Khan

Maithani

Singh

2023

ACS Appl. Mater. Interfaces

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Ag2Se is an intriguing material for room-temperature energy harvesting. Herein, we report the fabrication of Ag2Se nanorod arrays by glancing angle deposition technique (GLAD) followed by simple selenization in a two-zone furnace. Ag2Se planar films of different thickness were also prepared. The unique tilted Ag2Se nanorod arrays show excellent zT = 1.14 ± 0.09 and a power factor of 3229.21 ± 149.01 μW/m-K2, respectively, at 300 K. The superior thermoelectric performance of Ag2Se nanorod arrays compared to planar Ag2Se films could be ascribed to the unique nanocolumnar architecture that not only facilitates efficient electron transport but also significantly scatters phonons at the interfaces. Furthermore, the nanoindentation measurements were performed to explore mechanical properties of the as-prepared films. The Ag2Se nanorod arrays showed hardness values of 116.51 ± 4.25 MPa and elastic modulus of 10,966.01 ± 529.61 MPa, which are lowered by 51.8 and 45.6%, compared to Ag2Se films, respectively. The synergetic dependence between the tilt structure and thermoelectric properties accompanied with the simultaneous improvement in mechanical properties opens a new avenue for the practical applications of Ag2Se in next-generation flexible thermoelectric devices.

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“…3), consistent with those of amorphous elemental Se. [9][10][11] The supernatant was dried under vacuum at room temperature and the resulting solid was redissolved in water, and syringe filtered (Fisher, 0.22 μm) to exclude remaining solids, yielding a red clear solution. A few aliquots of the latter were then injected into a short reversed phase column using water as the eluent until no UV response was detected.…”

Section: Resultsmentioning

confidence: 99%

The Reactivity of Selenite toward Methyl Viologen in Mildly Acidic Aqueous Solutions

Han

Feng

Scherson

2017

J. Electrochem. Soc.

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The chemical and electrochemical reactivity of selenite, SeO 3 2− , toward methyl viologen, MV 2+ , has been examined in mildly acidic (pH 4) aqueous electrolytes. Solutions containing these two species heated at 60 • C for ca. 2 hours, were found to yield both 1-methyl-[4,4'-bipyridine]-1-ium chloride and elemental Se as the main reaction products, as evidenced from information derived from mass spectrometric and spectroscopic techniques. Cyclic voltammetric measurements recorded in acetate buffer (pH 4) with a glassy carbon, GC, electrode bearing a self-assembled monolayer, SAM, of N-ethyl-N'-octadecyl-4,4'-bipyridinium (EOB), which had been exposed to a 100 mM SeO 3 2− solution in aqueous acetate buffer (pH 4) for over 200 min and then rinsed with ultrapure water, displayed a significantly smaller redox peak ascribed to the reduction of the viologen moiety in the EOB SAM. This observation is consistent with the loss of the redox active species within the layer and supports the view that SeO 3 2− can cleave the N-C bond in EOB leading to the release of the viologen group into the solution. Cyclic voltammetric experiments involving a freshly prepared EOB SAM on GC in 1 mM SeO 3 2− in the same buffer yielded a large reduction current with an onset potential virtually identical to that associated with the reduction of the EOB SAM in SeO 3 2− -free solutions. On this basis, the extraordinary shift in the onset of SeO 3 2− reduction induced by the presence of MV 2+ in the same electrolyte reported by Koshikumo et al. [Electrochemistry (Tokyo, Jpn.), 81(5), 350 ( 2013)], may be explained by invoking formation of MV 2+ aggregates on the GC surface in amounts too small to be detected by conventional voltammetric techniques.

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Structural, vibrational and optical studies on an amorphous Se₉₀P₁₀alloy produced by mechanical alloying

Cited by 7 publications

References 34 publications

Structural investigations on an amorphous Se₉₀Te₁₀alloy produced by mechanical alloying using EXAFS, cumulant expansion and RMC simulations

Structural investigations on an amorphous Se₉₀Te₁₀alloy produced by mechanical alloying using EXAFS, cumulant expansion and RMC simulations

Ag₂Se Nanorod Arrays with Ultrahigh Room Temperature Thermoelectric Performance and Superior Mechanical Properties

The Reactivity of Selenite toward Methyl Viologen in Mildly Acidic Aqueous Solutions

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Structural, vibrational and optical studies on an amorphous Se90P10alloy produced by mechanical alloying

Cited by 7 publications

References 34 publications

Structural investigations on an amorphous Se90Te10alloy produced by mechanical alloying using EXAFS, cumulant expansion and RMC simulations

Structural investigations on an amorphous Se90Te10alloy produced by mechanical alloying using EXAFS, cumulant expansion and RMC simulations

Ag2Se Nanorod Arrays with Ultrahigh Room Temperature Thermoelectric Performance and Superior Mechanical Properties

The Reactivity of Selenite toward Methyl Viologen in Mildly Acidic Aqueous Solutions

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Structural, vibrational and optical studies on an amorphous Se₉₀P₁₀alloy produced by mechanical alloying

Structural investigations on an amorphous Se₉₀Te₁₀alloy produced by mechanical alloying using EXAFS, cumulant expansion and RMC simulations

Structural investigations on an amorphous Se₉₀Te₁₀alloy produced by mechanical alloying using EXAFS, cumulant expansion and RMC simulations

Ag₂Se Nanorod Arrays with Ultrahigh Room Temperature Thermoelectric Performance and Superior Mechanical Properties