Isothermal section of the La-Mg-Sn system at 500  °C and crystal structure of the new ternary stannide LaMgSn 2

Negri, S. De; Solokha, Pavlo; Minetti, Riccardo; Skrobańska, Monika; Saccone, A.

doi:10.1016/j.jssc.2017.01.016

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…% at 500 °C according to Ref. [17], while in our research the solubility reaches 4 at. % at 400 °C that is confirmed by X-ray powder diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX).…”

Section: Introductionsupporting

confidence: 58%

Synthesis, crystal structure, and electrochemical hydrogenation of the La2Mg17-xMx (M = Ni, Sn, Sb) solid solutions

et al. 2021

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The crystal structure of La2Mg17-xSnx solid solution was determined by single crystal X-ray diffraction for the first time. This phase crystallizes in hexagonal symmetry with space group P63/mmc (a = 10.3911(3), c = 10.2702(3) Å, V = 960.36(6) Å3, R1 = 0.0180, wR2 = 0.0443 for the composition La3.65Mg30Sn1.10) and is related to the structure of CeMg10.3 and Th2Ni17-types which are derivative from the CaCu5-type. A series of isotypical solid solutions La2Mg17-xMx (M = Ni, Sn, Sb, x ~0.8) was synthesized and studied by X-ray powder diffraction, energy dispersive X-ray spectroscopy and fluorescent X-ray spectroscopy. All solid solutions crystallize with the structure related to the Th2Ni17-type. The electrochemical hydrogenation confirmed the similar electrochemical behavior of all studied alloys. The amount of deintercalated hydrogen depends on the physical and chemical characteristics of doping elements and increases in the sequence Sn < Mg < Sb < Ni. The most geometrically advantageous sites are octahedral voids 6h of the initial structure, thus a coordination polyhedron for H-atom is an octahedron [HLa2(Mg,M)4].

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Section: Introductionsupporting

confidence: 58%

Synthesis, crystal structure, and electrochemical hydrogenation of the La2Mg17-xMx (M = Ni, Sn, Sb) solid solutions

et al. 2021

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“…The applied synthetic method often leads to inhomogeneous, multi-phase alloys, nevertheless Results of EDXS analysis of the two title phases found in several samples annealed at 500 °C [15] are listed in Table 2, showing a detectable homogeneity range for both.…”

Section: Sample Characterization By Sem-edxs Analysismentioning

confidence: 99%

“…In fact, the high oxidizability of binary and ternary alloys based on R-Sn systems is an experimental drawback which significantly hampers the research of new compounds. Nevertheless, during our investigation of the La-Mg-Sn system [15] several novel ternary intermetallics were detected and characterized:…”

Section: Introductionmentioning

confidence: 99%

Crystal structures of the new ternary stannides La3Mg4−Sn2+ and LaMg3−Sn2

Solokha

Negri

Minetti

et al. 2016

Journal of Solid State Chemistry

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Synthesis and structural characterization of the two new lanthanum-magnesium-stannides La 3 Mg 4x Sn 2+x (0.12x0.40) and LaMg 3-x Sn 2 (0.33x0.78) are reported. The crystal structures of these intermetallics were determined by single crystal X-ray diffraction analysis and confirmed by Rietveld refinement of powder X-ray diffraction patterns of the corresponding samples. The La 3 Mg 4-x Sn 2+x phase crystallizes in the hexagonal Zr 3 Cu 4 Si 2 structure type (P 62m, hP9, Z=3, x = 0.12(1), a = 7.7974(7), c = 4.8384(4) Å), which represents an ordered derivative of the hP9-ZrNiAl prototype, ubiquitous among equiatomic intermetallics. The LaMg 3-x Sn 2 phase is the second representative of the trigonal LaMg 3-x Ge 2 type, which is a superstructure of the LaLi 3 Sb 2 structure type (P 31c, hP34-0.12, Z=6, x = 0.35(1), a = 8.3222(9), c = 14.9546(16) Å). The scheme describing the symmetry reduction/colouring with respect to the parent type is reported here with the purpose to discuss the LaMg 3-x Sn 2 off-stoichiometry from the geometrical point of view. Structural relationships between the La-Mg-Sn ternary phases, including the already known equiatomic LaMgSn compound (oP12-TiNiSi), are presented in the framework of the AlB 2-related compounds family and discussed with the aid of group-subgroup relations in the Bärnighausen formalism.

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“…During these studies, the LaMgSn 2 compound was found and its crystal structure was solved by powder X-ray diffraction analysis, which revealed it to be a new prototype. [14] Therefore, the existence of compounds with the same stoichiometry was explored by substituting La with other 4f metals, besides Sc and Y. In this work, the novel isostructural series of RMgSn 2 (R = Y, La, Ce-Nd, Sm, Gd-Tm, Lu) phases is presented, the crystal structures of which were determined through single-crystal X-ray diffraction analysis of the Ce representative.…”

Section: Introductionmentioning

confidence: 99%

“…Our recent work on the La‐Mg‐Sn system, proved that many R –Mg–Sn ternary phases are likely to exist. During these studies, the LaMgSn 2 compound was found and its crystal structure was solved by powder X‐ray diffraction analysis, which revealed it to be a new prototype .…”

Section: Introductionmentioning

confidence: 99%

The RMgSn₂ Series of Compounds (R = Rare Earth Metal): Synthesis, Crystal Structure, and Magnetic Measurements

et al. 2017

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The novel isostructural series of phases RMgSn2 (R = Y, La–Nd, Sm, Gd–Tm, Lu) is presented. They were prepared by direct synthesis in an induction furnace and subsequently annealed at 500 °C. Their crystal structures were determined through single‐crystal X‐ray diffraction analysis of the Ce representative [I42m, tI32‐LaMgSn2, Z = 8, a = 0.82863(3) nm, c = 1.23129(5) nm] and confirmed by powder X‐ray diffraction analysis of the other members of the series. Rietveld refinements were also performed on the homologues with R = Pr, Tm, and Y. The title phases show a unique space distribution of atoms, characterized by the presence of a Sn–Sn dumbbell distanced at around 0.29 nm. Their structures are related to those of a few binary AeTt3 (Ae = alkaline earth; Tt = Si, Ge; I4/mmm, tI32‐YbSi3) compounds that are stable at high pressure, characterized by a more complex 3D covalently bonded Tt network. Compounds CeMgSn2 and TbMgSn2 were magnetically characterized; they show paramagnetic behavior with the presence of ferromagnetic interactions, more pronounced in the case of TbMgSn2, as suggested by the Curie–Weiss temperatures, determined in the high‐temperature range, of 0.96 and 27.6 K for CeMgSn2 and TbMgSn2, respectively.

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Isothermal section of the La-Mg-Sn system at 500 °C and crystal structure of the new ternary stannide LaMgSn 2

Cited by 9 publications

References 26 publications

Synthesis, crystal structure, and electrochemical hydrogenation of the La2Mg17-xMx (M = Ni, Sn, Sb) solid solutions

Synthesis, crystal structure, and electrochemical hydrogenation of the La2Mg17-xMx (M = Ni, Sn, Sb) solid solutions

Crystal structures of the new ternary stannides La3Mg4−Sn2+ and LaMg3−Sn2

The RMgSn₂ Series of Compounds (R = Rare Earth Metal): Synthesis, Crystal Structure, and Magnetic Measurements

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Isothermal section of the La-Mg-Sn system at 500 °C and crystal structure of the new ternary stannide LaMgSn 2

Cited by 9 publications

References 26 publications

Synthesis, crystal structure, and electrochemical hydrogenation of the La2Mg17-xMx (M = Ni, Sn, Sb) solid solutions

Synthesis, crystal structure, and electrochemical hydrogenation of the La2Mg17-xMx (M = Ni, Sn, Sb) solid solutions

Crystal structures of the new ternary stannides La3Mg4−Sn2+ and LaMg3−Sn2

The RMgSn2 Series of Compounds (R = Rare Earth Metal): Synthesis, Crystal Structure, and Magnetic Measurements

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The RMgSn₂ Series of Compounds (R = Rare Earth Metal): Synthesis, Crystal Structure, and Magnetic Measurements