New tetragonal compounds Nb3Si and Ta3Si

Deardorff, D.K.; Siemens, R.E.; Romans, P. A.; McCune, R. A.

doi:10.1016/0022-5088(69)90115-5

Cited by 58 publications

(7 citation statements)

References 5 publications

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“…However, the stoichiometry of Ta 4.5 Si was not firmly established in their work. Brewer and Krikorian [18] suggested that Ta 4.5 Si was a metastable crystalline phase, which was later confirmed by Deardorff et al [19] A new compound, Ta 3 Si, was further identified by x-ray diffraction (XRD). [19,20] Kocherzhinskii et al [21] carefully measured the phase diagram of the Si-Ta system using metallographic, XRD, and differential thermal analysis (DTA) techniques.…”

Section: The Si-ta Systemmentioning

confidence: 91%

“…Brewer and Krikorian [18] suggested that Ta 4.5 Si was a metastable crystalline phase, which was later confirmed by Deardorff et al [19] A new compound, Ta 3 Si, was further identified by x-ray diffraction (XRD). [19,20] Kocherzhinskii et al [21] carefully measured the phase diagram of the Si-Ta system using metallographic, XRD, and differential thermal analysis (DTA) techniques. The liquidus data between 25 and 60 at.% Si are very consistent with the results of Kieffer et al [16] In addition to TaSi 2 , Ta 2 Si, Ta 3 Si, they reported the existence of Ta 5 Si 3 in two crystal structures: aTa 5 Si 3 (Cr 5 B 3 -type) at low temperatures and bTa 5 Si 3 (W 5 Si 3 -type) at high temperatures.…”

Section: The Si-ta Systemmentioning

confidence: 91%

“…Most experimental work showed that the solubility of Ta in Si was negligible. [16][17][18][19][20][21] By means of direct-reaction calorimetry, Robins and Jenkins [23] measured the enthalpies of formation of aTa 5 Si 3 (À39.7 kJ/mol) and TaSi 2 (À14.4 kJ/mol) at ambient temperature. Myers and Searcy [24] determined the Gibbs energies of formation (D f G) of four compounds using Knudsen effusion cells.…”

Section: The Si-ta Systemmentioning

confidence: 99%

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Thermodynamic Assessment of the Si-Ta and Si-W Systems

Guo

Yuan

Sun

et al. 2009

J. Phase Equilib. Diffus.

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The knowledge of phase diagram and thermodynamic properties of the Si-Ta and Si-W systems is of technical importance for metallic contacts between Ta, W, and SiC in electrical and electronic devices. The phase diagram and thermodynamic properties of the Si-Ta and Si-W systems were assessed using the CALPHAD approach with available experimental data. The intermetallic compounds of the two systems were modeled as stoichiometric ones. A set of self-consistent thermodynamic parameters were obtained and the calculated phase equilibria were found to be in reasonable agreement with most experimental data. The calculated enthalpies of formation of the silicides in the Si-Ta and Si-W systems were compared with the reported values. The enthalpies of mixing of liquid at 2000 K in similar Si-transition metal systems were used for comparison in order to judge the rationality of the calculations. The assessed thermodynamic descriptions of the Si-Ta and Si-W binary systems will serve as part of the thermodynamic database for the Si-C-M (M: Ta and W) alloys.

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Section: The Si-ta Systemmentioning

confidence: 91%

Section: The Si-ta Systemmentioning

confidence: 91%

Section: The Si-ta Systemmentioning

confidence: 99%

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Thermodynamic Assessment of the Si-Ta and Si-W Systems

Guo

Yuan

Sun

et al. 2009

J. Phase Equilib. Diffus.

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“…They illustrated projections of the Cr3Si and Ti3P structures, as well as the similar FeaP structure, and a compilation of known alloys in these three structures. The occurrence of Nb3Si in the Ti3P structure was independently reported by Deardorff, Siemens, Romans & McCune (1969) in their study of the Nb-Si system. They supplied a single crystal to Waterstrat, Yvon, Flack & Parth6 (1975) who undertook the single-crystal study that we consulted for our crystallographic projection of the Ti3P structure of Nb3Si.…”

Section: Discussionmentioning

confidence: 57%

Mechanisms for a rapid phase transformation of Nb₃Si from the Ti₃P structure to the Cr₃Si (A15) structure

Olinger¹,

Newkirk²,

King³

1982

Acta Cryst Sect A

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Nb3Si in the Cr3Si (A15) structure has been successfully recovered in bulk amounts after shock compressing Nb3Si in the Ti3P structure. The material was under compression less than 1 ~s. To account for the extreme rapidity of the transformation we find that the essential characteristics of the Cr3Si structure can be achieved by screw rotating one type of column of Nb-atom pairs 45 ° and one quarter cell length in the Ti3P structure. It is further shown that the Fe3P structure cannot be similarly transformed.

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“…(but is present in such small amounts that a stable refinement was not possible) and a number of not so well described metastable/high temperature/impurity stabilised phases reported in NbeSi system [13] (such as Nb 7 Si [14] and Nb 4 Si [15]). The total amount of impurities was estimated to be less than 5% in the Nb 4 Co 0.9 Si 1.1 sample and less than 10% in the Nb 4 Ni 0.9 Si 1.1 sample (most of this being the Nb-rich alloy).…”

Section: Phase Analysismentioning

confidence: 96%