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Redetermination of the crystal structures of rare-earth trirhodium diboride RERh₃B₂ (RE = Pr, Nd and Sm) from single-crystal X-ray data.

ABSTRACT: The crystal structures of the rare-earth (RE) trirhodium diborides praseo-dymium trirhodium diboride, PrRh₃B₂, neodymium trirhodium diboride, NdRh₃B₂, and samarium trirhodium diboride, SmRh₃B₂, were refined on the basis of single-crystal X-ray diffraction data. The crystal chemistry of RERh₃B₂ (RE: Pr, Nd, and Sm) compounds has previously been analyzed mainly on the basis of powder samples [Ku et al. (1980 ▸). Solid State Commun. 35, 91-96], and no structural investigation by single-crystal X-ray diffraction has been reported so far. The crystal structures of the three hexa-gonal RERh₃B₂ compounds are isotypic with that of CeRh₃B₂; RE, Rh and B sites are situated on special positions with site symmetry 6/mmm (Wyckoff position 1a), mmm (3g) and m2 (2c), respectively. In comparison with the previous powder X-ray study of hexa-gonal RERh₃B₂, the present redetermination against single-crystal X-ray data has allowed for the modeling of all atoms with anisotropic displacement parameters (ADPs). The ADPs of the Rh atom in each of the structures result in an elongated displacement ellipsoid in the direction of the stacking of the Rh kagomé-type layer. The features of obtained ADPs of atoms are discussed in relation to RERh₃B₂-type and analogous structures.

SUBMITTER: Tokuda M

PROVIDER: S-EPMC8739198 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Biomedical implants and devices for tissue engineering in clinics, mainly made of polymers and stiff metallic materials, require possibly secondary surgery or life-long medicine. Biodegradable metals for biomedical implants and devices exhibit huge potential to improve the prognosis of patients. In this work, we developed a new type of biodegradable binary zinc (Zn) alloys with 16 rare earth elements (REEs) including Sc, Y, La to Nd, and Sm to Lu, respectively. The effects of REEs on the alloy microstructure, mechanical properties, corrosion behavior and in vitro and in vivo biocompatibility of Zn were systematically investigated using pure Zn as control. All Zn-RE alloys generally exhibited improved mechanical properties, and biocompatibilities compared to pure Zn, especially the tensile strength and ductility of Zn-RE alloys were dramatically enhanced. Among the Zn-RE alloys, different REEs presented enhancement effects at varied extent. Y, Ho and Lu were the three elements displaying greatest improvements in majority of alloys properties, while Eu, Gd and Dy exhibited least improvement. Furthermore, the Zn-RE alloys were comparable with other Zn alloys and also exhibited superior properties to Mg-RE alloys. The in vivo experiment using Zn–La, Zn–Ce, and Zn–Nd alloys as tibia bone implants in rabbit demonstrated the excellent tissue biocompatibility and much more obvious osseointegration than the pure Zn control group. This work presented the significant potential of the developed Zn-RE binary alloys as novel degradable metal for biomedical implants and devices. Graphical abstract (a) Material preparation and characterizations. (b) Mechanical Properties and (c) Bone-implant interfaces.Image 1 Highlights • Novel binary Zn alloys with 16 rare earth elements including Sc, Y, La–Nd, Sm–Lu were firstly developed.• The alloying of rare earth element increased the tensile strength and elongation rate of pure Zn.• The Y, Ho, and Lu were the three elements that signficantly improved most of properties of Zn.• The binary Zn-RE alloys display superior property enhancement from rare earth element compared to Mg-RE alloys.• The in vivo implantation of the Zn–La, Zn–Ce, and Zn–Nd alloys exhibited much more obvious osseointegration than the pure Zn.

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Redetermination of the crystal structures of rare-earth trirhodium diboride RERh₃B₂ (RE = Pr, Nd and Sm) from single-crystal X-ray data.

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Redetermination of the crystal structures of rare-earth trirhodium diboride RERh3B2 (RE = Pr, Nd and Sm) from single-crystal X-ray data.

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Redetermination of the crystal structures of rare-earth trirhodium diboride RERh₃B₂ (RE = Pr, Nd and Sm) from single-crystal X-ray data.