An Obscured or Nonexistent Binary Intermetallic, Co7Pr17, Its Existent Neighbor Co2Pr5, and Two New Ternaries in the System Co/Sn/Pr, CoSn3Pr1–x, and Co2–xSn7Pr3

Rhodehouse, Melissa L.; Bell, Thomas A.; Smetana, Volodymyr; Mudring, Anja‐Verena; Meyer, Gerd

doi:10.1021/acs.cgd.8b01141

Cited by 5 publications

(6 citation statements)

References 61 publications

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“…The latter was apparently working as a flux for the crystal growth of the intermetallic. A similar outcome has been observed for the synthesis targeting {CoPr 3 }Br 3 leading to the formation of Co 7 Pr 17 . It is interesting to note that the corresponding binary intermetallic systems, Pr/Pt and Pr/Co, have been investigated thoroughly, yet neither Pr 4 Pt 3 nor Pr 17 Co 7 had been identified during the initial phase diagram constructions.…”

Section: Introductionsupporting

confidence: 69%

“…A similar outcome has been observed for the synthesis targeting {CoPr 3 }Br 3 leading to the formation of Co 7 Pr 17 . 5 It is interesting to note that the corresponding binary intermetallic systems, Pr/Pt and Pr/Co, have been investigated thoroughly, 6 yet neither Pr 4 Pt 3 nor Pr 17 Co 7 had been identified during the initial phase diagram constructions. Note that from here on the notation R/T is adopted which is more common in the intermetallics community.…”

Section: ■ Introductionmentioning

confidence: 99%

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Binary Intermetallics in the 70 atom % R Region of Two R–Pd Systems (R = Tb and Er): Hidden, Obscured, or Nonexistent?

et al. 2020

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Although rare-earth-metal–transition-metal (R/T) phase diagrams have been explored extensively, our recent studies have uncovered new previously nonexistent binary intermetallics. These compounds belong to a narrow region between 70 and 71.4 atom % of the rare-earth metal but represent four different structure types. The binaries Tb 7 Pd 3 and Er 17 Pd 7 are compositionally approaching (less than 1 atom % difference) the previously reported R 2.16 Pd 0.89 (R = Tb and Er), and apparently form by peritectoid transformation, thus, being hard to detect by fast cooling. Tb 7 Pd 3 ( 1 ) crystallizes in the Th 7 Fe 3 structure type ( hP 20, P 6 3 mc , a = 9.8846(4) Å, c = 6.2316(3) Å, Z = 2) while Er 17 Pd 7 ( 2 ) belongs to the Pr 17 Co 7 type being its second reported representative ( cP 96, P 2 1 3, a = 13.365(2) Å, Z = 4). Er 17 Pd 7 ( 2 ) is overlapping with the cubic F -centered Er 2.11 Pd 0.89 ( 3b , Fd 3̅ m , a = 13.361(1) Å, Z = 32) with practically identical unit cell parameters but a significantly different structure. Electronic structure calculations confirm that heteroatomic R–T bonding strongly dominates in all structures; T–T bonding interactions are individually strong but do not play a significant role in the total bonding.

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Section: Introductionsupporting

confidence: 69%

Section: ■ Introductionmentioning

confidence: 99%

Binary Intermetallics in the 70 atom % R Region of Two R–Pd Systems (R = Tb and Er): Hidden, Obscured, or Nonexistent?

et al. 2020

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“…For instance, complex mixed formations inside Au/In tunnels have been observed in Ca 3 Au 3 In . Capped trigonal prismatic motifs both isolated and fused are quite common in binary intermetallics. − …”

Section: Resultsmentioning

confidence: 99%

Honeycomb Constructs in the La–Ni Intermetallics: Controlling Dimensionality via p-Element Substitution

Shtender,

Smetana,

Crivello

et al. 2023

Inorg. Chem.

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The new ternary compounds La15Ni13Bi5 and La9Ni8Sn5 were obtained by arc melting under argon from appropriate amounts of the elements and subsequent annealing at 800 °C for 2 weeks. Single-crystal X-ray diffraction reveals that they represent two new structure types: La15Ni13Bi5 crystallizes in the hexagonal space group P 2m [hP33, a = 14.995(3), c = 4.3421(10) Å, V = 845.5(4) Å3, Z = 1] and La9Ni8Sn5 in P63/m [hP88, a = 23.870(15), c = 4.433(3) Å, V = 2187(3) Å3, Z = 4]. The crystal structures of both compounds are characterized by hexagonal honeycomb-based motifs formed by Ni and Sn that extend along the c axis. The building motif with its three-blade wind turbine shape is reminiscent of the organic molecule triptycene and is unprecedented in extended solids. First-principles calculations have been performed in order to analyze the electronic structure and provide insight into chemical bonding. They reveal significant electron transfer from La to Ni and the respective p-element, which supports the formation of the polyanionic Ni-p-element network. DFT calculations suggest paramagnetic-like behavior for both compounds, which was confirmed by magnetic measurements.

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“…Alternatively, chemical activities can be increased by utilizing suitable media, e.g., low-melting metal fluxes or molten salts. Although the flux approach has yielded many intermetallic compounds not easily accessible by conventional high-temperature methods, − its application to Au-containing compositions remains rather limited, − mostly because the intended reaction partner for gold often forms stable phases with the flux constituents instead.…”

Section: Introductionmentioning

confidence: 99%

Overlooked Binary Compounds Uncovered in the Reinspection of the La–Au System: Synthesis, Crystal Structures, and Electronic Properties of La₇Au₃, La₃Au₂, and La₃Au₄

Ovchinnikov

Mudring

2021

Inorg. Chem.

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Although compound formation between two elements is well studied, thorough investigations make it possible to uncover new binary compounds. A re-examination of the La–Au system revealed three new phases, which were characterized with respect to their structural and electronic properties as well as thermal stability: La 7 Au 3 (Th 7 Fe 3 type, space group P 6 3 mc , Pearson code hP 20) appears to be metastable. It can be obtained by slow crystallization from a stoichiometric melt. La 3 Au 2 (U 3 Si 2 type, space group P 4/ mbm , Pearson code tP 10) is stable up to 1013 K, where it decomposes peritectically. La 3 Au 4 (Pu 3 Pd 4 type, space group R 3̅, Pearson code hR 14) is thermally stable up to at least 1273 K. In addition, the crystal structures of La 2 Au ( anti -PbCl 2 type, space group Pnma , Pearson code oP 12) and α-LaAu (FeB type, space group Pnma , Pearson code oP 8) could be determined by single-crystal X-ray diffraction. The electronic structures and chemical bonding have been evaluated from first principles calculations. They show that all compounds can be viewed as electron-rich, polar intermetallics.

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An Obscured or Nonexistent Binary Intermetallic, Co₇Pr₁₇, Its Existent Neighbor Co₂Pr₅, and Two New Ternaries in the System Co/Sn/Pr, CoSn₃Pr_1–x, and Co_2–xSn₇Pr₃

Cited by 5 publications

References 61 publications

Binary Intermetallics in the 70 atom % R Region of Two R–Pd Systems (R = Tb and Er): Hidden, Obscured, or Nonexistent?

Binary Intermetallics in the 70 atom % R Region of Two R–Pd Systems (R = Tb and Er): Hidden, Obscured, or Nonexistent?

Honeycomb Constructs in the La–Ni Intermetallics: Controlling Dimensionality via p-Element Substitution

Overlooked Binary Compounds Uncovered in the Reinspection of the La–Au System: Synthesis, Crystal Structures, and Electronic Properties of La₇Au₃, La₃Au₂, and La₃Au₄

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An Obscured or Nonexistent Binary Intermetallic, Co7Pr17, Its Existent Neighbor Co2Pr5, and Two New Ternaries in the System Co/Sn/Pr, CoSn3Pr1–x, and Co2–xSn7Pr3

Cited by 5 publications

References 61 publications

Binary Intermetallics in the 70 atom % R Region of Two R–Pd Systems (R = Tb and Er): Hidden, Obscured, or Nonexistent?

Binary Intermetallics in the 70 atom % R Region of Two R–Pd Systems (R = Tb and Er): Hidden, Obscured, or Nonexistent?

Honeycomb Constructs in the La–Ni Intermetallics: Controlling Dimensionality via p-Element Substitution

Overlooked Binary Compounds Uncovered in the Reinspection of the La–Au System: Synthesis, Crystal Structures, and Electronic Properties of La7Au3, La3Au2, and La3Au4

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An Obscured or Nonexistent Binary Intermetallic, Co₇Pr₁₇, Its Existent Neighbor Co₂Pr₅, and Two New Ternaries in the System Co/Sn/Pr, CoSn₃Pr_1–x, and Co_2–xSn₇Pr₃

Overlooked Binary Compounds Uncovered in the Reinspection of the La–Au System: Synthesis, Crystal Structures, and Electronic Properties of La₇Au₃, La₃Au₂, and La₃Au₄