BaAl₄ derivative phases in the sections {La,Ce}Ni₂Si₂–{La,Ce}Zn₂Si₂: phase relations, crystal structures and physical properties

Abstract

at 800°C using electron microprobe analysis and X-ray powder and single crystal structure analyses. Although the systems La-Zn-Si and Ce-Zn-Si at 800°C do not reveal compounds such as "LaZn 2 Si 2 " or "CeZn 2 Si 2 ", solid solutions {La,Ce}(Ni 1−x Zn x ) 2 Si 2 exist with the Ni/Zn substitution starting from {La,

The Ce–Ni–Si System Revisited: More Homologue Compounds?

“…A new phase Ce(Ni 1– x Si x ) 3 with composition of Ce∼25Ni∼45Si∼30 ( x = 0.4, labeled as τ) was first observed in an as-cast sample with nominal composition of Ce20Ni42Si38 during our previous investigation on the BaAl 4 derivative phases in the ternary and quaternary {La,Ce}-(Ni,Zn)-Si systems. 10 The amount of this phase in the as-cast state increases as the sample composition shifts toward the Ni side at constant Ce content. Based on the microstructure of an as-cast sample with composition of Ce22.8Ni52.3Si24.9 ( Figure 1 A), it can be concluded that this new phase forms incongruently.…”

“…12 During our latest work on the BaAl 4 derivative phases in the {La,Ce}-(Ni,Zn)-Si systems, we discovered a new phase labeled as Ce(Ni 1−x Si x ) 3 . 10 Further investigation into the new phase led us to discover another phase with close composition and a similar powder diffraction pattern. Moreover, during this work, we also solved a hitherto unknown crystal structure, Ce 3 Ni 4 Si 2 (formerly CeNi 1.3 Si 0.7 ).…”

“…Studies of the ternary Ce-TM-Si systems were started over four decades ago, − with an exception for the Zn-containing system, which was reported more recently. , Among ternary Ce-TM-Si systems, the system with nickel exhibits the largest number of ternary phases and structure types . Since the first study in 1969, more ternary Ce–Ni–Si compounds have been discovered; − however, for some compounds, their crystal structures still remain unresolved, e.g ., CeNi 1.3 Si 0.7 and Ce 27 Ni 43 Si 30 …”

“… 7 , 8 Among ternary Ce-TM-Si systems, the system with nickel exhibits the largest number of ternary phases and structure types. 9 Since the first study in 1969, more ternary Ce–Ni–Si compounds have been discovered; 10 − 13 however, for some compounds, their crystal structures still remain unresolved, e.g ., CeNi 1.3 Si 0.7 and Ce 27 Ni 43 Si 30 . 12 …”

Influence of chemical composition on the X-ray photoemission, thermopower, specific heat, and magnetic properties of CeNi2(Si1-yGey)2

“…It includes heavy fermions (HF), superconductivity, fluctuating valence, magnetic ordering, and non-Fermiliquid (NFL) behaviour [1][2][3][4][5].…”