Structural and thermal study of nanostructured GaSb alloy prepared by mechanical alloying

Lima, J.C. de; Schmitt, Mayka; Souza, Sérgio Michielon de; Almeida, T.O.; Jerônimo, A.R.; Trichês, Daniela Menegon; Grandi, T.A.; Campos, Carlos Eduardo Maduro de

doi:10.1016/j.jallcom.2006.06.104

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…In previous studies, we produced InSb and GaSb by MA and no dissociation of these phases was observed for milling times up 10 h [29,30]. Thus, a comparison with these compounds may be helpful.…”

Section: Xrd Measurementsmentioning

confidence: 97%

Structural instability and photoacoustic study of AlSb prepared by mechanical alloying

Trichês

Souza

Poffo

et al. 2010

Journal of Alloys and Compounds

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Section: Xrd Measurementsmentioning

confidence: 97%

Structural instability and photoacoustic study of AlSb prepared by mechanical alloying

Trichês

Souza

Poffo

et al. 2010

Journal of Alloys and Compounds

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“…The use of photoacoustic absorption spectroscopy to determine the thermal diffusivity parameter and/or the transport properties of semiconducting materials is widely documented in the literature [34][35][36][37][38][39][40] and references therein. The thermal diffusivity may be calculated using the expression for the thermal conductivity K t =ρC p α, where ρ is the density, C p is the specific heat, and α is the thermal diffusivity.…”

Section: Pas Measurementsmentioning

confidence: 99%

“…The procedure to find the contribution of each process to pressure variation in the photoacoustic cell is described in Ref. 40 and it will not be repeated here. Figure 7 shows the plots ln(S) vs f and Φ ph (rad) vs f for modulations frequencies between 22 and 32 Hz, where the thermal diffusion mechanism is the main contribution to PAS signal amplitude and phase.…”

Section: Pas Measurementsmentioning

confidence: 99%

Structural and Photoacoustic Study of Cr11Ge19 Prepared by Mechanical Alloying

et al. 2017

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A nanostructured Cr 11 Ge 19 phase was produced by mechanical alloying for 15 h. Decomposition occurred for larger milling times, yielding Cr, Ge, Cr 2 O 3 and GeO 2. According to the Cr-Ge phase diagram, the Cr 11 Ge 19 phase is stable up to ≈ 928 o C, but, when submitted to milling, a structural instability causes its decomposition. We studied this structural instability using the coordination numbers and interatomic distances of bulk Cr 11 Ge 19 to simulate the structure factors S CrCr (K), S CrGe (K), and S GeGe (K). The radial distribution functions RDF CrCr (R), RDF CrGe (R) and RDF GeGe (R) were obtained by Fourier transforming the S ij (K) factors, and an important chemical disorder up to ≈7 Å was observed in the RDF CrGe (R) and RDF GeGe (R) functions. This chemical disorder was quantified using Cowley-Warren ij CW a parameter. The thermoelectric properties of the Cr 11 Ge 19 phase were also studied.

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“…Thus, an analysis of the PAS signal phase allows one to distinguish these processes and determine the α s , D, v, and τ parameters. The way to identify each process is given in the literature [21].…”

Section: Open Photoacoustic Cell Measurement and Determination Of The...mentioning

confidence: 99%

Effects of photoacoustic measurements on a nanostructured ZnSe mechanically alloyed

Lima

Campos

Grandi

2008

J. Phys.: Condens. Matter

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Zinc-blende ZnSe powder, with particles containing nanometric grains, was prepared using the mechanical alloying technique, from an equiatomic mixture of elemental Zn and Se powders. An important interfacial component was observed in the as-milled powder, which affects its thermal and optical properties. In order to obtain a high-quality zinc-blende ZnSe powder an annealing process was applied. The structural properties of both as-milled and annealed powders were characterized by an x-ray diffraction technique. The effects of defect centers on the optical band gap of both as-milled and annealed zinc-blende ZnSe powders were studied through optical absorbance measurements. The results showed a substantial broadening and a shift of the band gap energy to lower values in the as-milled powder, while for the annealed sample no effects were observed. For the annealed sample, the measured band gap energy value is in good agreement with those reported in the literature. A sequence of photoacoustic absorption measurements of the as-milled ZnSe sample showed that the absorbed energy promotes a structural relaxation. This relaxation causes a change in the heat transfer mechanism from thermal diffusion to thermoelastic bending and a reduction in the thermal diffusivity values. Similar measurements of the annealed nanostructured ZnSe sample showed the thermal diffusivity value to have a high degree of stability, and to be in good agreement with values reported in the literature.

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Structural and thermal study of nanostructured GaSb alloy prepared by mechanical alloying

Cited by 9 publications

References 29 publications

Structural instability and photoacoustic study of AlSb prepared by mechanical alloying

Structural instability and photoacoustic study of AlSb prepared by mechanical alloying

Structural and Photoacoustic Study of Cr11Ge19 Prepared by Mechanical Alloying

Effects of photoacoustic measurements on a nanostructured ZnSe mechanically alloyed

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