Thermodynamic Description of the Ce-Ga Binary System

Idbenali, M.; Servant, C.; Feddaoui, M’barek

doi:10.1007/s11669-013-0261-y

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…The substitution of Ga at place of Al in various alloy systems has been extensively studied by our group [45][46][47][48][49][50]. The Ce-Al [51] and Ce-Ga [52] binaries have negative heat of mixing, while Ga-Al pair has very low positive heat of mixing, i.e., 0.7 KJ/mol [53]. It seems unlikely that the phase separation is caused by Ga-Al which has a very small positive heat of mixing.…”

Section: Introductionmentioning

confidence: 99%

Phase Separation in Ce-Based Metallic Glasses

Singh¹,

Mor²,

Singh³

et al. 2020

Metallic Glasses

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In this chapter, the results of our recent studies on the role of Ga substitution in place of Al in Ce 75 Al 25 − x Ga x (x = 0, 0.01, 0.1, 0.5, 1, 2, 4, and 6) metallic glasses (MGs) have been discussed with the aim to understand the genesis of phase separation. X-ray diffraction (XRD) study reveals two broad diffuse peaks corresponding to the coexistence of two amorphous phases. In order to see any change in the behavior of 4f electron of Ce, X-ray absorption spectroscopy (XAS) has been carried out for Ce 75 Al 25 − x Ga x MGs. From the XAS results, it is evident that for x = 0, the spectrum exhibits only a 4f 1 component, which basically shows a pure localized configuration of electron. After the addition of Ga, 4f electrons of Ce atoms denoted by 4f 0 are getting delocalized. Thus, the phase separation in Ce 75 Al 25 − x Ga x is taking place, owing to the formation of two types of amorphous phases having localized and delocalized 4f electrons of Ce atoms, respectively. It has been discussed how change in the electronic structure of Ce atoms may lead to phase separation in Ce 75 Al 25 − x Ga x alloys. Extensive TEM investigations have been done to study the phase separation in these alloys. The microstructural features have been compared with those obtained by phase field modeling.

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