Homogeneity range and crystal structure of the Ca2Mg5Zn13 compound

Zhang, Yinan; Kevorkov, Dmytro; Liu, Xue Dong; Bridier, Florent; Chartrand, Patrice; Medraj, Mamoun

doi:10.1016/j.jallcom.2012.01.068

Cited by 15 publications

(12 citation statements)

References 15 publications

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“…9. The current experimental results obtained by Rietveld analysis of crystallographic and the site occupancy show similar results compared to the previous results reported for Mg 11 Zn 4 Ca 3 [30] compounds, which have the same crystal structure.…”

Section: Crystal Structure Analysis For Mg 15 − X Zn X Srsupporting

confidence: 91%

“…Combining Pearson's crystallographic database [29] with the Rietveld analysis, the new Mg 15 − x Zn x Sr 3 compound was found to crystallize in hexagonal P6 3 /mmc (194) space group and has the Ni 11 Si 4 Sc 3 prototype. This is the same structure type as Mg 11 Zn 4 Ca 3 (IM1) compound in the Mg-Zn-Ca ternary system reported by Zhang et al [30,31]. The sites of 6h (1) (x = 0.5618, y = 0.1236, z = 0.25), 4f, 2b, and 12k are occupied with Mg and Zn atoms to form the continuous solid solubility, and the site of 6h (2) (x = 0.192, y = 0.384, z = 0.25) are occupied with Sr. Fig.…”

Section: Crystal Structure Analysis For Mg 15 − X Zn X Srsupporting

confidence: 75%

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Experimental study of the crystal structure of the Mg15−xZnxSr3 ternary solid solution in the Mg–Zn–Sr system at 300°C

et al. 2015

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Section: Crystal Structure Analysis For Mg 15 − X Zn X Srsupporting

confidence: 91%

Section: Crystal Structure Analysis For Mg 15 − X Zn X Srsupporting

confidence: 75%

Experimental study of the crystal structure of the Mg15−xZnxSr3 ternary solid solution in the Mg–Zn–Sr system at 300°C

et al. 2015

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“…The IM3 compound has the Ca x Mg y Zn z (8.2 ≤ x ≤ 9.1; 27.1 ≤ y ≤ 31.0; 60.8 ≤ z ≤ 64.7) composition range at 335 °C. This compound has hexagonal structure with P6 3 /mmc (194) space group and Sm 3 Mg 13 Zn 30 prototype .…”

Section: Resultsmentioning

confidence: 99%

“…(a) Isothermal section of the Mg–Ca–Zn system at 335 °C , (b) calculated vertical section of the Mg–Ca–Zn system at 0.8 wt.% Ca and phase assemblage diagram of (c) Mg–0.8Ca–1.25Zn, (d) Mg–0.8Ca–2.5Zn, and (e) Mg–0.8Ca–4Zn alloys…”

Section: Resultsmentioning

confidence: 99%

Microstructure and bio‐corrosion behavior of Mg–Zn and Mg–Zn–Ca alloys for biomedical applications

Bakhsheshi‐Rad

Hamzah

Fereidouni-Lotfabadi

et al. 2014

Materials & Corrosion

111

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The microstructure and bio-corrosion behavior of binary Mg-xZn (x ¼ 1.25, 2.5, 4) and ternary Mg-Ca-xZn (x ¼ 1.25, 2.5, 4) alloys have been studied using scanning electron microscopy (SEM), electrochemical, and immersion tests. Microstructure analysis indicated that the binary Mg-Zn alloys are composed of primary a-Mg matrix and Mg 12 Zn 13 phases, while, ternary Mg-Ca-Zn alloys are composed of a-Mg, Mg 2 Ca, and IM1 (Ca 3 Mg x Zn 15Àx ) (4.6 x 12) phases or a-Mg, IM1 and IM3 (Ca 2 Mg 5 Zn 13 ) phases. Electrochemical results showed that Mg-4Zn alloy has lowest corrosion rate among binary alloys. At constant Ca content of 0.8 wt.%, the addition of Zn up to 1.25 wt.% decreased the corrosion rate, while further addition of Zn increased the corrosion rate of ternary alloys. Immersion tests results demonstrated that the formation of Zn oxide layer in binary Mg-Zn alloy and evolution of eutectic phase (a-Mg þ IM1 þ Mg 2 Ca) significantly retard the bio-degradation rate of the ternary alloys.

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“…references on this topic e.g. in reference) by the group of Medraj . In their work, the authors denoted the four newly detected intermetallic phases in the system – irrespective of the already known and isotypic rare‐earth intermetallics – using their own nomenclature as intermetallic phases “IM1” to “IM4”.…”

Section: Introductionmentioning

confidence: 99%

Zn‐rich Zincides of the Ternary System Ca–Mg–Zn: Synthesis, Crystal structure, Chemical Bonding

Köhler

Röhr

2019

Zeitschrift anorg allge chemie

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In the course of a study on the role of magnesium in polar zincides of the heavier alkaline-earth elements, three intermetallic phases of the ternary system Ca-Mg-Zn were synthesized from melts of the elements and their structures were determined by means of single-crystal X-ray data. Starting from the binary zincide CaZn 11 , the phase width of the BaCd 11 -type structure reaches up to the fully ordered stoichiometric compound CaMgZn 10 [tI48, space group I4 1 /amd, a = 1082.66(6), c = 688.95(5) pm, Z = 4, R 1 = 0.0239]. The new compound CaMgZn 5 (oP28, space group Pnma, a = 867.48(3), b = 530.37(5), c = 1104.45(9) pm, Z = 4, R 1 = 0.0385) crystallizes in the CeCu 6 -type structure, exhibits no Mg/Zn phase width and has no binary border equivalent in the system Ca-Mg-Zn. Similar to the situation in CaMgZn 10 , one M position of the aristotype has a slightly larger coordination sphere (CN = 14) and is accordingly occupied by the larger Mg atoms. The third phase, Ca 2+x Mg 6-x-y Zn 15+y (hP92, space 219 group P6 3 /mmc, a = 1476.00(5), c = 881.01(4) pm, Z = 4, R 1 = 0.0399 for Ca 2.67 Mg 5.18 Zn 15.15 ) forms the hexagonal Sm 3 Mg 13 Zn 30 -type structure also known as μ-MgZnRE or S phase. A small phase width (x = 0-0.67; y = 0-0.58) is due to the slightly variable Ca or Zn content of the two Mg positions. The structure is described as an intergrowth of the hexagonal MgZn 2 Laves phase and the CaZn 2 structure (KHg 2type). All compounds exhibit strong Zn-Zn and polar Mg-Zn covalent bonds, which are visible in the calculated electron density maps. Their structures are thus herein described using the full space tilings of [Zn 4 ] and [MgZn 3 ] tetrahedra, which are fused to polyanions consisting of tetrahedra stars, icosahedra segments etc. and the large (CN = 18-22) Ca cation coordination polyhedra. Pseudo bandgaps apparent in the tDOS are compatible with the narrow v.e./M ranges observed for other isotypic members of the three structure types.

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Homogeneity range and crystal structure of the Ca2Mg5Zn13 compound

Cited by 15 publications

References 15 publications

Experimental study of the crystal structure of the Mg15−xZnxSr3 ternary solid solution in the Mg–Zn–Sr system at 300°C

Experimental study of the crystal structure of the Mg15−xZnxSr3 ternary solid solution in the Mg–Zn–Sr system at 300°C

Microstructure and bio‐corrosion behavior of Mg–Zn and Mg–Zn–Ca alloys for biomedical applications

Zn‐rich Zincides of the Ternary System Ca–Mg–Zn: Synthesis, Crystal structure, Chemical Bonding

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