Triple phase structure and electron density analysis of the thermoelectric material Bi80Sb20

Robert, M. Charles; Saravanan, R.

doi:10.1016/j.powtec.2009.09.009

Cited by 10 publications

(6 citation statements)

References 9 publications

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“…It is an emerging and popular technique for the synthesis of Bi-Sb alloy as well as other related metal chalcogenides based thermoelectric materials [26][27][28][29]. Stoichiometric quatities of Cu-Kα radiation.…”

Section: Methodsmentioning

confidence: 99%

“…Polycrystalline Bi0.88Sb0.12 samples were synthesized by melting of high purity Bi and Sb powder. It is an emerging and popular technique for the synthesis of Bi-Sb alloy as well as other related metal chalcogenides based thermoelectric materials [26][27][28][29]. Stoichiometric quatities of quartz tube were heated upto three different temperatures viz., 973 K, 1273 K and 1473 K and soaked for 10 h and finally rapidly quenched in liquid Nitrogen.…”

Section: Methodsmentioning

confidence: 99%

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The effect of quenching from different temperatures on Bi0.88Sb0.12 alloy

Malik

Das

Neogi

et al. 2016

Journal of Physics and Chemistry of Solids

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Structural, thermal, resistive and magnetic properties of melt quenched Bi0.88Sb0.12 alloys are reported. The samples are heated at three different temperatures, followed by rapid quenching in liquid nitrogen. Large temperature difference between liquidus and solidus lines, led to microscopic in-homogeneity in the alloy. The effect of quenching from different temperatures in polycrystalline Bi0.88Sb0.12 alloy has been studied. The parameters such as strain, unit cell volume, and resistivity are found to increase with temperature. Thermal variation of resistivity depicts non monotonic temperature dependence. The total negative susceptibility increases and band gap of semiconducting Bi0.88Sb0.12 samples decreases with increasing temperature.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The effect of quenching from different temperatures on Bi0.88Sb0.12 alloy

Malik

Das

Neogi

et al. 2016

Journal of Physics and Chemistry of Solids

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“…In addition to the covalent nature, heavy charge concentration with localized nature supports the thermoelectric character in InSb. Robert and Saravanan [17] have studied that the enhancement of the electron density in Bi 80 Sb 20 can give high electrical conductivity. For a thermoelectric material, phonon glass and electron crystal (PGEC) behaviour is essential.…”

Section: Resultsmentioning

confidence: 99%

“…A PGEC material features cages (or tunnels) in crystal structure inside which reside atoms small enough to rattle, i.e., to create dynamic disorder. This situation produces a phonon damping effect which results in a reduction of the solid lattice thermal conductivity [17]. In Bi 80 Sb 20 the 2D MEM electron density maps of Bi, Sb on the (110) plane show that though there are open channels (voids) in Sb and Bi for higher lattice vibrations, there is much less space for the atoms to contribute lattice vibration in Bi 80 Sb 20 .…”

Section: Resultsmentioning

confidence: 99%

Single Crystal Charge Density Studies of Thermoelectric Material Indium Antimonide

Robert¹,

Subha²,

Ramachandran³

2011

Zeitschrift Für Naturforschung A

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The average structure of the thermoelectric material indium antimonide (InSb) has been studied in terms of the electron density distribution using the single crystal X-ray intensity data. The charge density of this material has been studied including and excluding the quasi-forbidden h + k + l = 4n + 2 type reflections using the maximum entropy method (MEM). Both the pictorial and numerical results of the experimental electron density show mixed ionic and covalent character in InSb. The use of InSb as a thermoelectric material is supported through charge density analysis.

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“…Figure 2 shows the thermal variation of B iso for the synthesized alloys. B iso , obtained after refining the temperature-dependent XRD data, is a measure of the mean square displacement of atoms [34,35].…”

mentioning

confidence: 99%

Evidence of iso-structural phase transition in rhombohedral Bi-Sb alloy

Malik

Das

Deb

et al. 2016

EPL

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Temperature-dependent structural studies of polycrystalline Bi1−xSbx alloys were carried out using synchrotron x-ray diffraction. In-depth powder diffraction analysis reveals that an iso-structural phase transition takes place in the rhombohedral Bi-Sb alloy around 200 K, which is accompanied by anomalous behavior in the temperature-dependent linear thermal expansion data. In addition, the thermal variation of refined isotropic thermal parameters or Debye-Waller factor (Biso), ratio of the lattice parameters and Debye temperature indicates that anisotropy, arising due to local structural disorder, plays a significant role in this material.

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Triple phase structure and electron density analysis of the thermoelectric material Bi80Sb20

Cited by 10 publications

References 9 publications

The effect of quenching from different temperatures on Bi0.88Sb0.12 alloy

The effect of quenching from different temperatures on Bi0.88Sb0.12 alloy

Single Crystal Charge Density Studies of Thermoelectric Material Indium Antimonide

Evidence of iso-structural phase transition in rhombohedral Bi-Sb alloy

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