Critical assessment and optimization of phase diagrams and thermodynamic properties of RE–Zn systems-part I: Sc–Zn, La–Zn, Ce–Zn, Pr–Zn, Nd–Zn, Pm–Zn and Sm–Zn

Critical Systematic Evaluation and Thermodynamic Optimization of the Fe-RE System: RE = Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y

“…35 Comparison of integral enthalpies of liquid Fe-RE at 1873 K systems, the enthalpies of mixing are already very negative, so it is hard to observe the clear trend in enthalpy of mixing data: for example, the Si-RE alloys (-65 to -75 kJ mol -1 ), [24] Pb-RE alloys (-40 to -60 kJ mol -1 ), [26] Al-RE systems (-30 to -40 kJ mol -1 ) [27] and Zn-RE systems (-20 to -32 kJ mol -1 ). [30] The optimized DH o 298 and DS o 298 of the binary Fe-RE systems from the respective elements are presented in Fig. 36 and 37 values measured by Meschel et al [55] are mostly more positive than the optimized values in the present study.…”

“…For example, we have already performed thermodynamic optimization for RE-Sn, [19,20] Mn, [21][22][23] Si, [24,25] Pb, [26] Al, [27,28] Mg, [29] and Zn. [30] In our previous study [31] the critical evaluation and optimization of the Fe-light RE systems, where RE = La, Ce, Pr, Nd, and Sm, was performed. As the second part of the thermodynamic modeling study of the whole Fe-RE systems, the critical optimization of the Fe-heavy RE systems where RE = Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y is presented in this study.…”

Systematic in vitro and in vivo study on biodegradable binary Zn-0.2 at% Rare Earth alloys (Zn-RE: Sc, Y, La–Nd, Sm–Lu)

“…It has been reported that the ions of certain REEs could stimulate the seed cell proliferation and osteogenic differentiation and activate osteogenic signaling pathways [ 6 ], and further to promote new bone formation. For example, La 3+ exhibited a bidirectional concentration dependence on bone marrow stromal cells (BMSCs) differentiation [ [39] , [40] , [41] ], while Ce 3+ can promote collagen deposition, osteoblast formation and bone regeneration [ 42 ]. Similarly, Nd 3+ in the safe concentration range showed inhibitory effect on osteoclasts [ 43 ].…”

“…Fig. 1 (a) shows the phase diagrams of the binary Zn-RE systems with the preferentially formed intermetallic compounds and their proportions along the atomic percentage of RE in the alloy [ 39 , 40 ]. At room temperature, the solid solubility of all the 16 REEs to alloy in Zn matrix is very low, therefore, the alloyed RE elements would mainly exist in the form of intermetallic compound in the Zn-RE alloys, as listed in Fig.…”