Zwei weitere Oxometallate zum Ba5Mn4Ln8O21-Typ: Ba5Mn4Sm8O21 und Ba5Mn4Ho8O21

Klüver, E.; Peters, E.‐M.; Müller‐Buschbaum, Hk.

doi:10.1016/0925-8388(92)90053-c

Cited by 11 publications

(4 citation statements)

References 15 publications

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“…In a previous work, we reported a new family of compound R 8 Ba 5 Ni 4 O 21 for the three smallest lanthanides (R = Tm, Yb, and Lu), establishing its structural type. Afterward, other oxometalates of manganese (II) of generic formulas Ba 5 Mn 4 R 8 O 21 , which belong to this same structural type, have been reported. , Because interesting relations can be found between crystal structure and magnetic properties of these oxometalates containing d and f cations, the authors tried to grow crystals of those oxides of this family formed by larger lanthanides. The aims of this work are to investigate the variation of the structural type as a function of the rare-earth ionic size, to study the existence of magnetic interactions among the mentioned cations, and to situate the R 8 Ba 5 Ni 4 O 21 family in the R−Ba−Ni−O phase diagram.…”

Section: Introductionmentioning

confidence: 99%

New Barium Rare-Earth Nickel Oxides: Synthesis, Crystal Structure, and Magnetic Order

et al. 1998

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Crystals of isostructural R8Ba5Ni4O21 (R = Y, Er, Tm, Yb, and Lu) have been obtained. Conditions for synthesis and stability are reported. The crystal structures of these materials have been established by single-crystal X-ray diffraction: space group I4/m with cell-parameters a =13.713(1) and 13.666(3) Å, c = 5.692(1) and 5.673(2) Å for R = Y and Er, respectively. The compounds contain square NiO5 pyramids, trigonal RO7 prisms capped on one rectangular face, tetragonal bicapped Ba(1)O10 prisms, and irregular Ba(2)O10 polyhedra. A comparison is made between this structure type and those of R2BaNiO5 and R2BaCuO5. Their structure and properties show close relations. The temperature dependence of the magnetic susceptibility from 350 to 1.8 K, measured for R = Y, Yb, and Er, shows the presence of antiferromagnetic ordering for the Yb and Er compounds.

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Section: Introductionmentioning

confidence: 99%

New Barium Rare-Earth Nickel Oxides: Synthesis, Crystal Structure, and Magnetic Order

et al. 1998

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“…These Ba 5 R g 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 (Kliiver etal, 1992;Miiller-Buschbaum and Kliiver, 1992;Miiller-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: B Crystal Structure Of Ba 5 R 8 Zn 4 0 2 Imentioning

confidence: 99%

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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“…The XRD patterns can be indexed by the space group I4/m and are consistent with those of the Ba 5 RE 8 Mn 4 O 21 compounds reported in Refs. [4]- [6].…”

Section: Crystal Structurementioning

confidence: 99%

“…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. In the present work, the crystal structures and physical properties of the new compound, Ba 5 Y 8−x Mn 4 O 21−1.5x , are investigated by X-ray powder diffraction, magnetization measurements, and temperature-dependent resistivity and dielectric measurements.…”

Section: Introductionmentioning

confidence: 99%

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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Zwei weitere Oxometallate zum Ba5Mn4Ln8O21-Typ: Ba5Mn4Sm8O21 und Ba5Mn4Ho8O21

Cited by 11 publications

References 15 publications

New Barium Rare-Earth Nickel Oxides: Synthesis, Crystal Structure, and Magnetic Order

New Barium Rare-Earth Nickel Oxides: Synthesis, Crystal Structure, and Magnetic Order

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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Zwei weitere Oxometallate zum Ba5Mn4Ln8O21-Typ: Ba5Mn4Sm8O21 und Ba5Mn4Ho8O21

Cited by 11 publications

References 15 publications

New Barium Rare-Earth Nickel Oxides: Synthesis, Crystal Structure, and Magnetic Order

New Barium Rare-Earth Nickel Oxides: Synthesis, Crystal Structure, and Magnetic Order

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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Product

Resources

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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,