Experimental investigation and thermodynamic description of the Co–Si system

Zhang, Lijun; Du, Yong; Xu, Honghui; Pan, Zhu

doi:10.1016/j.calphad.2006.06.001

Cited by 52 publications

(33 citation statements)

References 26 publications

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“…The most recent Co-Si phase diagram [25] exhibits the CoSi 2 , CoSi,  -Co 2 Si and Co 3 Si intermetallic phases of known crystallographic structures reported in [26], i.e., while the structure of  -Co 2 Si was not yet determined [27]. It is worthwhile to mention that the experimental data used for the optimization of the Co-Si phase diagram [24,25] are in good agreement within experimental errors.…”

Section: Accepted M Manuscriptsupporting

confidence: 61%

“…4 assessments of its phase diagram [22][23][24][25], there are some minor discrepancies between thermodynamic data related to the Co-Co 2 Si section (Co rich part) and the melting temperatures of the intermetallic phases present in the system. The most recent Co-Si phase diagram [25] exhibits the CoSi 2 , CoSi,  -Co 2 Si and Co 3 Si intermetallic phases of known crystallographic structures reported in [26], i.e., while the structure of  -Co 2 Si was not yet determined [27].…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Thermodynamic, surface and structural properties of liquid Co-Si alloys

Novaković

Giuranno

Caccia

et al. 2016

Journal of Molecular Liquids

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The knowledge of thermophysical properties of liquid Co-Si alloys is a key requirement for manufacturing of composite materials by infiltration method. Despite this need, the experimental and predicted property data of the Co-Si system are scarce and often inconsistent between the various sources. In the present work the mixing behaviour of Co-Si melts has been analyzed through the study of the concentration dependence of various thermodynamic, surface (surface tension and surface composition) and structural properties (concentration fluctuations in the long-wavelength limit and chemical short-range order parameter) in the framework of the Compound Formation Model (CFM) and Quasi Chemical Approximation for regular solutions (QCA). In addition, the surface tension of the Co 22.5 Si 77.5 (in at %) eutectic alloy, that is proposed to be used as the infiltrant, has been measured by the pendant drop method at temperatures ranging from 1593 to 1773 K. The results obtained were discussed with respect to both, temperature and concentration, and subsequently compared with the model predictions and literature data.

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Section: Accepted M Manuscriptsupporting

confidence: 61%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Thermodynamic, surface and structural properties of liquid Co-Si alloys

Novaković

Giuranno

Caccia

et al. 2016

Journal of Molecular Liquids

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“…Using the data of Cp and ΔHf at the melting temperature (42 J/mol·K [24] and 35678 J/mol [25]), one can estimate the fs to be 0.179 and 0.302 for undercoolings of 152 K and 257 K, respectively. Furthermore, one can estimate compositions of the remaining melt to be CoSi-60.9 at.…”

Section: Emissivity Change During Solidificationmentioning

confidence: 99%

Formation of Cellular Structure on Metastable Solidification of Undercooled Eutectic CoSi-62 at. %

Jeon

Matson

2017

Crystals

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Abstract:The relationship between emissivity, delay time, and surface growth for metastable solidification of CoSi-62 at. % eutectic alloys is reported from undercooling experiments conducted using electrostatic levitation. A fraction of the undercooled melt is first solidified to CoSi 2 with subsequent nucleation in the mushy-zone of CoSi after an observed delay time. During this double recalescence event, the temperature of the secondary recalescence exceeds the liquidus, indicating that the spectral emissivity has changed. This emissivity change increases with longer delay times during solidification and is linked to the growth of cellular structure on the sample surface. Density measurements showed that the cellular structure begins to grow rapidly at a certain time during metastable solidification. This phenomenon is likely associated with the constitutional undercooling of the remaining melt.

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“…The high temperature phase of Co 3 Si has been synthesized and characterized to have the hexagonal structure with space group P6 3 /mmc (referred to as h-Co 3 Si structure from now on) [13][14][15][16]. Based on experimental observations, this h-Co 3 Si structure is only stable in a narrow temperature range of ~ 1190 to 1200 ˚C [13].…”

Section: Introductionmentioning

confidence: 99%

“…The nanoparticle phase of Co 3 Si was produced using non-equilibrium cluster-deposition and effective easy-axis alignment methods [6]. It was reported to have the same crystal symmetry as h-Co 3 Si but the lattice parameters (a=4.99 Å and c=4.50 Å) are much larger along c axis than that of the bulk h-Co 3 Si phase (a=4.98 Å and c=4.07 Å) [15,16], indicating the structure of the nanoparticle phase prepared at the far from equilibrium conditions is different from that of the high temperature bulk h-Co 3 Si phase. Using 4 DFT calculations [6], the h-Co 3 Si structure (a=4.99 Å and c=4.50 Å) has been shown to exhibit an easy plane anisotropy with a high K 1 = -6.4 MJ/m 3 , while the Co 3 Si nanoparticle phase was measured to have very large uniaxial anisotropy K 1 = 4.8 MJ/m 3 .…”

Section: Introductionmentioning

confidence: 99%

Structures, phase transitions, and magnetic properties of Co3Si from first-principles calculations

Zhao

et al. 2017

Phys. Rev. B

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Co 3 Si was recently reported to exhibit remarkable magnetic properties in the nanoparticle form [Appl. Phys. Lett. 108, 152406 (2016)], yet better understanding of this material is to be promoted. Here we report a study on the crystal structures of Co 3 Si using adaptive genetic algorithm, and discuss its electronic and magnetic properties from first-principles calculations.Several competing phases of Co 3 Si have been revealed from our calculations. We show that the hexagonal Co 3 Si structure reported in experiments has lower energy in non-magnetic state than ferromagnetic state at zero temperature. The ferromagnetic state of the hexagonal structure is dynamically unstable with imaginary phonon modes and transforms to a new orthorhombic structure, which is confirmed by our structure searches to have the lowest energy for both Co 3 Si and Co 3 Ge. Magnetic properties of the experimental hexagonal structure and the lowest-energy structures obtained from our structure searches are investigated in detail.2

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Experimental investigation and thermodynamic description of the Co–Si system

Cited by 52 publications

References 26 publications

Thermodynamic, surface and structural properties of liquid Co-Si alloys

Thermodynamic, surface and structural properties of liquid Co-Si alloys

Formation of Cellular Structure on Metastable Solidification of Undercooled Eutectic CoSi-62 at. %

Structures, phase transitions, and magnetic properties of Co3Si from first-principles calculations

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