Die Kristallstruktur von Ba5Mn4Gd8O21

Müller‐Buschbaum, Hk.; Rabbow, Ch.

doi:10.1016/0925-8388(92)90164-5

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…Room temperature X‐ray diffraction data were obtained either by a Huber image‐plate camera with a Co‐ K α X‐ray source or a STOE STADI‐P with a Mo‐ K α X‐ray source and a Mythen 1 K detector (Dectris). A Rietveld analysis of the powder X‐ray data were completed by the JANA2006 software; The starting positions for the atoms were taken from literature, the background was fitted with 20 Chebyshev polynoms, all peaks were modeled with Pseudo‐Voigt functions, the relatively smaller Fe1 site was fixed to contain solely Fe and the larger Fe2 site with 1/3Fe and 2/3Mn, and all sites were refined with isotropic thermal displacement parameters. Only the scaling of the secondary phase MnO was refined.…”

Section: Methodsmentioning

confidence: 99%

“…During the last 15 years, the chemical diversity of the Swedenborgites was explored. Comparing with the mineral, cations Li + , Al 3+ , Si 4+ , Ga 3+ , Co 2–3+ , Fe 2–3+ , Mn 2+ , Ni 2+ , and Zn 2+ were reported at the original Be 2+ site, while Ba 2+ , Sr 2+ , and Eu 2+ can enter the Na + site,, , and Ca 2+ , In 3+ , Y 3+ , Sc 3+ , and rare‐earths Nd 3+ – Lu 3+ can replace Sb 5+ , . Further, its anions exhibit a SiAlON‐like chemistry: a certain oxide solubility in the nitride was reported in the series LnM [Si 4– x Al x O x N 7– x ] ( Ln = Ho – Yb, M = Sr, Eu, x < 2) .…”

Section: Introductionmentioning

confidence: 99%

“…At the end of the 20th century, the first synthetic Swedenborgite homologues Ln Ba(Zn 3 Al)O 7 ( Ln = Lu or Sm) were reported by Hans Karl Müller‐Buschbaum et al and, consequently, a magnetic ion (Sm 3+ ) was introduced. Almost simultaneously, Wolfgang Schnick et al succeeded in synthesizing the nitrides Yb M Si 4 N 7 ( M = Ba, Sr, Eu) with Swedenborgite structure, emphasizing the anion chemical flexibility of this crystal structure type.…”

Section: Introductionmentioning

confidence: 99%

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Swedenborgite CaBa(Mn₂Fe₂)O₇ with Spin Ordering on a Geometrically Frustrated, Polar, Non‐centrosymmetric S = 5/2 Lattice

Valldor

Yadav

Hozoi

et al. 2017

Zeitschrift anorg allge chemie

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By solid‐state reaction in closed ampoules, almost phase pure Swedenborgite CaBa(Mn2Fe2)O7 [P63mc, a = 6.4100(1) Å, c = 10.3752(2) Å] was obtained. Thermodynamic and melting behavior investigations suggest that this complex oxide melts incongruently and that the true composition contains a minor surplus of Fe as compared to Mn. However, in first approximation, the magnetic transition metal lattice (Mn2Fe2) can be described as a homogeneous S = 5/2 system and consists of kagome layers with an intermediate trigonal site. A long range antiferromagnetic ordering is observed at TN = 205.5 K, as proven by magnetometry and specific heat measurements. The S = 5/2 (high‐spin d5) on‐site configuration is confirmed by ab initio quantum chemical calculations, which additionally indicate antiferromagnetic Heisenberg interactions with a ratio of 1.56 between the spin coupling constants of the two distinct d5–d5 links (in and out of the kagome plane). In light of recent numerical studies for the extended Swedenborgite spin lattice, this quantum chemical estimate for the Jout/Jin ratio in combination with magneto‐electric coupling, as a consequence of the polar, non‐centrosymmetric crystal structure, explain the experimentally found antiferromagnetic order.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Swedenborgite CaBa(Mn₂Fe₂)O₇ with Spin Ordering on a Geometrically Frustrated, Polar, Non‐centrosymmetric S = 5/2 Lattice

Valldor

Yadav

Hozoi

et al. 2017

Zeitschrift anorg allge chemie

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“…These Ba 5 R 8 Zn 4 O 21 phases are isostructural to Ba 5 R 8 Ni 4 O 21 (Campa´ et al , 1991) and Ba 5 R 8 Mn 4 O 21 (Klu¨ver et al , 1992; Mu¨ller-Buschbaum and Klu¨ver, 1992; Mu¨ller-Buschbaum and Rabbow, 1992). Selected bond distances, together with the average values and the distortion ratios (ratio of the shortest distance to the longest one), are presented in Table III.…”

Section: Resultsmentioning

confidence: 98%

Crystallographic studies and X-ray diffraction patterns of Ba₅R₈Zn₄O₂₁ by Rietveld refinements

2001

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The structure of the Ba5R8Zn4O21 series (R=lanthanides) was investigated using X-ray Rietveld refinements. The compounds were successfully prepared for R=Eu, Gd, Dy, Ho, Er, Tm, and Yb. Ba5R8Zn4O21 crystallizes in the tetragonal space group I4/m; for R=Yb to Eu, a ranges from 13.635 02(5) to 13.960 62(9) Å, c from 5.658 46(3) to 5.784 83(5) Å, and V from 1051.987(8) to 1127.459(14) Å3. The Zn2+ ions adopt a fivefold distorted square pyramidal coordination. The seven-coordinate R3+ reside in monocapped trigonal prisms. These prisms share edges, and form layers stacked along the c axis. There are two types of BaO polyhedra: bicapped square prisms (BaO10), and irregular BaO10 polyhedra. For larger R, Ba5R8Zn4O21 was not stable, and tetragonal BaR2ZnO5(La, Nd) and orthorhombic BaR2ZnO5(Sm) phases were observed instead.

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“…New compounds, Ba 5 Y 8−x Mn 4 O 21−1.5x , belonging to the Ba 5 RE 8 Mn 4 O 21 -type oxometallate were obtained. The existence of Ba 5 RE 8 Mn 4 O 21 compounds, each of which crystallizes into tetragonal symmetry with space group I4/m, was reported for RE = Nd, [4] Gd, [5] Sm, and Ho. [6] However, the relevant physical properties have been rarely reported in the literature.…”

Section: Introductionmentioning

confidence: 95%

The crystal structures and physical properties of the solid solution compound Ba ₅ Y _{8−
x} Mn ₄ O _{21−1.5
x} ( x = 0,

Gao¹,

Li²,

Song³

et al. 2012

Chinese Phys. B

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New oxometallides with the formula Ba 5 Y 8−x Mn 4 O 21−1.5x (x = 0, 1) are prepared through an atmospherecontrolled solid-state reaction. Two single-phase samples with Ba/Y/Mn atomic ratios 5/8/4 (Y8) and 5/7/4 (Y7) are obtained. The crystal structures and the physical properties of the compounds are investigated by X-ray powder diffraction, magnetization, conductivity, and dielectricity measurements. The Ba 5 Y 8−x Mn 4 O 21−1.5x compound is demonstrated to be a Y-deficient solid solution. The solid solution compound Ba 5 Y 8−x Mn 4 O 21−1.5x crystallizes into tetragonal symmetry with the space group I4/m. Detailed structure analysis by Rietveld refinement of the X-ray powder diffraction data reveals that the Y vacancies occur preferentially at the Y(2) site. Thermal magnetization measurements indicate the presence of antiferromagnetic interaction between Mn ions in the compounds, and temperature-dependent resistivity measurements show that insulator-semiconductor transitions occur around 175 K and 170 K for the Y8 and Y7 samples, respectively. Strong frequency dependences of the dielectric constant are observed above ∼175 K for the two compounds.

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Die Kristallstruktur von Ba5Mn4Gd8O21

Cited by 7 publications

References 6 publications

Swedenborgite CaBa(Mn₂Fe₂)O₇ with Spin Ordering on a Geometrically Frustrated, Polar, Non‐centrosymmetric S = 5/2 Lattice

Swedenborgite CaBa(Mn₂Fe₂)O₇ with Spin Ordering on a Geometrically Frustrated, Polar, Non‐centrosymmetric S = 5/2 Lattice

Crystallographic studies and X-ray diffraction patterns of Ba₅R₈Zn₄O₂₁ by Rietveld refinements

The crystal structures and physical properties of the solid solution compound Ba ₅ Y _{8−
x} Mn ₄ O _{21−1.5
x} ( x = 0,

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Die Kristallstruktur von Ba5Mn4Gd8O21

Cited by 7 publications

References 6 publications

Swedenborgite CaBa(Mn2Fe2)O7 with Spin Ordering on a Geometrically Frustrated, Polar, Non‐centrosymmetric S = 5/2 Lattice

Swedenborgite CaBa(Mn2Fe2)O7 with Spin Ordering on a Geometrically Frustrated, Polar, Non‐centrosymmetric S = 5/2 Lattice

Crystallographic studies and X-ray diffraction patterns of Ba5R8Zn4O21 by Rietveld refinements

The crystal structures and physical properties of the solid solution compound Ba 5 Y 8− x Mn 4 O 21−1.5 x ( x = 0,

Contact Info

Product

Resources

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Swedenborgite CaBa(Mn₂Fe₂)O₇ with Spin Ordering on a Geometrically Frustrated, Polar, Non‐centrosymmetric S = 5/2 Lattice

Swedenborgite CaBa(Mn₂Fe₂)O₇ with Spin Ordering on a Geometrically Frustrated, Polar, Non‐centrosymmetric S = 5/2 Lattice

Crystallographic studies and X-ray diffraction patterns of Ba₅R₈Zn₄O₂₁ by Rietveld refinements

The crystal structures and physical properties of the solid solution compound Ba ₅ Y _{8−
x} Mn ₄ O _{21−1.5
x} ( x = 0,