Role of milling parameters and impurity on the thermoelectric properties of mechanically alloyed chromium silicide

Dasgupta, Titas; Umarji, A.M.

doi:10.1016/j.jallcom.2007.06.129

Cited by 39 publications

(22 citation statements)

References 13 publications

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“…Iron impurities can also modify the stoichiometry of the reaction. 470 Contamination is often not quantified and is frequently excluded based on XRD measurements, which are not accurate because of the low intensity and considerable broadening of reflections and the high level of background scattering that characterises the XRD patterns of products obtained by milling. For example, Rahaei et al 386 did not observe the presence of iron by XRD during the synthesis of c-TiC using steel milling media, but the chemical quantification revealed iron contamination of 0.09, 0.28, 0.72 and 1.76 wt% after 1, 4, 8 and 16 h of milling, respectively.…”

Section: View Article Onlinementioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

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Section: View Article Onlinementioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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“…3 Moreover, its high Seebeck coefficient (a) associated with its low electrical resistivity (r) make this compound promising for thermoelectric applications or even as a photoelectric source and in detection in the near infrared region. [4][5][6][7][8] Recent papers have also shown the possibility for improving the power factor by alloying with Al, V, Mn, Fe, P and Ti. 3 CrSi 2 alloys have been intensively studied over the past 15 years, mainly for their thermoelectric (TE) properties.…”

Section: Introductionmentioning

confidence: 99%

Revisited phonon assignment and electro-mechanical properties of chromium disilicide

et al. 2015

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We report a complete study of the lattice dynamics, dielectric, elastic and piezoelectric properties of hexagonal semiconducting chromium disilicide (CrSi 2 ). From a combined experimental and theoretical study, we have revisited the phonon mode assignments at the zone-center, so that the contradictions met in previous experimental studies between 250 and 300 cm À1 are now explained and understood.We found that the temperature dependence of the Raman frequencies is mainly due to an implicit volume contribution and related to the large Grüneisen parameter. This explains why CrSi 2 has a moderate thermal conductivity although its Debye temperature is quite large. Optic and static dielectric constants have also been analyzed and discussed. The elastic constants of CrSi 2 are large, but this compound is quite brittle. In addition, the relatively low Poisson coefficient associated to the large negative Cauchy pressure of CrSi 2 indicate the angular nature of its bonding. The calculation of its piezoelectric coefficient shows a sizable value with a magnitude similar to that reported for a-quartz.

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“…Other metals like Cr and V also provide second phase toughening of Cr 3 Si [18]. In addition, Dasgupta and Umarji [19] found a high figure of merit (ZT) of 0.2 at 600 K for CrSi 2 synthesized by mechanical alloying, which renders CrSi 2 a potential thermoelectric material for power generation.…”

Section: Introductionmentioning

confidence: 99%