Über ein Barium-Lanthanoid-Oxozinkat-Platinat(IV): Ba17Yb16Zn8Pt4O57

Rabbow, Ch.; Sfreddo, O.; Müller‐Buschbaum, Hk.

doi:10.1515/znb-1996-0208

Cited by 10 publications

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“…As there is no analog to the alkaline earth cations Sr 2+ /Ba 2+ , these positions remain vacant in the oxonitridoborate (see Figure 3 and Table S5 for the comparison with BaYbSi 4 N 7 ). The structure type of the nitridosilicates, NaBe 4 SbO 7 (swendenborgite), [15] also occurs as other substitution variants like BaLuAlZn 3 O 7 , [31] where the silicon position is statistically occupied by Al 3+ and Zn 2+ . In all these compounds, there are two metal cations incorporated into the anionic network.…”

Section: Resultsmentioning

confidence: 99%

The First High‐Pressure Chromium Oxonitridoborate CrB₄O₆N—an Unexpected Link to Nitridosilicate Chemistry

et al. 2021

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CrB4O6N crystallizes in the non‐centrosymmetric space group P63mc (no. 186) with the lattice parameters a=5.1036(1), c=8.3519(3) Å, and a volume of 188.40(1) Å3. It was synthesized in a high‐pressure/high‐temperature experiment at 7 GPa and 1673 K and represents the first high‐pressure oxonitridoborate. It is built up of starlike‐shaped entities of four BO3N tetrahedra, connected via one common nitrogen atom that resembles the fourfold‐coordinated nitrogen atoms in the homeotypic nitridosilicates MYbSi4N7 (M=Sr, Ba). Building up a network with channels that contain the Cr3+ ions, CrB4O6N contains for the first time a tetrahedral building unit in contrast to trigonal planar B(O/N)3 entities in all other known oxonitridoborates. The structural relations as well as the results of spectroscopic measurements and calculations on the chromium oxonitridoborate are discussed.

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Section: Resultsmentioning

confidence: 99%

The First High‐Pressure Chromium Oxonitridoborate CrB₄O₆N—an Unexpected Link to Nitridosilicate Chemistry

et al. 2021

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“…Da es in CrB 4 O 6 N keine den Erdalkali‐Kationen Sr 2+ /Ba 2+ entsprechenden Ionen gibt, bleiben diese Positionen im Oxonitridoborat frei (siehe Abbildung 3 und Tabelle S5 für den Vergleich mit BaYbSi 4 N 7 ). Vom Strukturtyp dieser Nitridosilikate, NaBe 4 SbO 7 (Swendenborgit), [15] sind weitere Substitutionsvarianten wie BaLuAlZn 3 O 7 bekannt, [31] in dem die Silicium‐Position statistisch von Al 3+ und Zn 2+ besetzt wird. Alle diese Verbindungen besitzen zwei Sorten an Metallkationen, die in das anionische Netzwerk eingebaut sind.…”

Section: Ergebnisse Und Diskussionunclassified

Das erste Hochdruck‐Chromoxonitridoborat CrB₄O₆N – ein unerwartetes Bindeglied zur Chemie der Nitridosilikate

et al. 2021

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CrB4O6N kristallisiert in der nicht‐zentrosymmetrischen Raumgruppe P63mc (Nr. 186) mit den Gitterparametern a=5.1036(1), c=8.3519(3) Å und einem Volumen von 188,40(1) Å3. Synthetisiert durch ein Hochdruck‐/Hochtemperaturexperiment bei 7 GPa und 1673 K, repräsentiert die Phase das erste Hochdruck‐Oxonitridoborat. Strukturell zeigen sich sternförmige Einheiten bestehend aus vier BO3N‐Tetraedern, die in Analogie zu den homeotypen Nitridosilikaten MYbSi4N7 (M=Sr, Ba, Eu) durch ein gemeinsames vierfach koordiniertes Stickstoffatom miteinander verknüpft sind. Diese Einheiten bilden ein Netzwerk aus, in dessen Kanälen die Cr3+‐Ionen liegen. Im Gegensatz zu den trigonal‐planaren B(O/N)3‐Einheiten in allen anderen bekannten Oxonitridoboraten zeigt CrB4O6N erstmals tetraedrische Baueinheiten. Die strukturellen Zusammenhänge sowie die Ergebnisse der spektroskopischen Messungen und theoretischen Rechnungen am Chromoxonitridoborat werden im Folgenden erörtert.

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“…The crystal structure of YBaCo 4 O 7+δ was first determined by single X-ray diffraction as a hexagonal unit cell with the space group of P6 3 mc and cell parameters of a = 6.2982 (4) and c = 10.2467(9) Å [22,32]. Such a phase is isostructural to the non-magnetic LuBaZn 3.09 Al 0.91 O 7+δ [33,34], but is magnetic with mixed-valent Co 2+/3+ ions at ambient condition. The Co ions are located at two different tetrahedral sites (2a and 6c) of the oxygen lattice, corner-connected to form the triangular and Kagomé layers in 1:1 stacking along the z-axis.…”

Section: Structural Analysis Of Cation-substituted Ybaco 4 Omentioning

confidence: 99%

Unravelling the low thermal expansion coefficient of cation-substituted YBaCo4O7+δ

Kan

Lai

Huq

et al. 2016

Journal of Power Sources

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With an aim to understand the origin of the low thermal expansion coefficients (TECs), cation-substituted YBaCo 4 O 7-type oxides have been investigated by in-situ neutron diffraction, bond valence sum (BVS), thermogravimetic analysis, and dilatometry. The compositions YBaCo 3 ZnO 7+δ , Y 0.9 In 0.1 BaCo 3 ZnO 7+δ , and Y 0.9 In 0.1 BaCo 3 Zn 0.6 Fe 0.4 O 7+δ were synthesized by solid-state reaction at 1200 o C. Rietveld refinement of the joint synchrotron X-ray and neutron diffraction data shows that the Zn and Fe dopants have different preferences to substitute the Co ions in the 6c and 2a sites. The bulk thermal-expansion coefficient of YBaCo 3 ZnO 7+δ , Y 0.9 In 0.1 BaCo 3 ZnO 7+δ , and Y 0.9 In 0.1 BaCo 3 Zn 0.6 Fe 0.4 O 7+δ are, respectively, 9.42, 9.76, and 9.06 x 10-6 o C-1. Neutron diffraction data show that the low anisotropic TEC along the a-axis is the main contributor to the low bulk TECs. With the substitution of In, Zn, and Fe in Y 0.9 In 0.1 BaCo 3 Zn 0.6 Fe 0.4 O 7+δ , the anisotropic and bulk TECs could be reduced to 8.94 and 9.06 x 10-6 o C-1 , respectively, mainly due to the suppression of the change in CoO bond length in CoO 4 polyhedra. The observed weight loss during heating is due to the loss of interstitial oxide ions, as revealed by neutron diffraction and BVS map. Y 0.9 In 0.1 BaCo 3 Zn 0.6 Fe 0.4 O 7+δ has the lowest areaspecific cathodic polarization resistance of 0.14 ohm cm 2 (R total /2) at 700 o C in air.

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Über ein Barium-Lanthanoid-Oxozinkat-Platinat(IV): Ba₁₇Yb₁₆Zn₈Pt₄O₅₇

Cited by 10 publications

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The First High‐Pressure Chromium Oxonitridoborate CrB₄O₆N—an Unexpected Link to Nitridosilicate Chemistry

The First High‐Pressure Chromium Oxonitridoborate CrB₄O₆N—an Unexpected Link to Nitridosilicate Chemistry

Das erste Hochdruck‐Chromoxonitridoborat CrB₄O₆N – ein unerwartetes Bindeglied zur Chemie der Nitridosilikate

Unravelling the low thermal expansion coefficient of cation-substituted YBaCo4O7+δ

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Über ein Barium-Lanthanoid-Oxozinkat-Platinat(IV): Ba17Yb16Zn8Pt4O57

Cited by 10 publications

References 0 publications

The First High‐Pressure Chromium Oxonitridoborate CrB4O6N—an Unexpected Link to Nitridosilicate Chemistry

The First High‐Pressure Chromium Oxonitridoborate CrB4O6N—an Unexpected Link to Nitridosilicate Chemistry

Das erste Hochdruck‐Chromoxonitridoborat CrB4O6N – ein unerwartetes Bindeglied zur Chemie der Nitridosilikate

Unravelling the low thermal expansion coefficient of cation-substituted YBaCo4O7+δ

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Über ein Barium-Lanthanoid-Oxozinkat-Platinat(IV): Ba₁₇Yb₁₆Zn₈Pt₄O₅₇

The First High‐Pressure Chromium Oxonitridoborate CrB₄O₆N—an Unexpected Link to Nitridosilicate Chemistry

The First High‐Pressure Chromium Oxonitridoborate CrB₄O₆N—an Unexpected Link to Nitridosilicate Chemistry

Das erste Hochdruck‐Chromoxonitridoborat CrB₄O₆N – ein unerwartetes Bindeglied zur Chemie der Nitridosilikate