Crystal structure and magnetic properties of A-site-ordered quadruple perovskite CeCu3Cr4O12

Belik, Alexei А.; Katsuya, Yoshio; Tanaka, Masahiko; Yamaura, Kazunari

doi:10.1016/j.jallcom.2019.04.128

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…All Ce-containing quadruple perovskite oxides, CeCu 3 B 4 O 12 ( B = Cr, Mn, Fe, and Co), show a double-peak line, which is a well-known signature of the Ce 4+ valence state, unlike a single peak of the Ce 3+ one (see a reference material Ce(CH 3 COO) 3 ·H 2 O). This observation confirms that the tetravalent states of Ce ions are predominant for all the quadruple perovskites measured, , although intermediate valences between Ce 3+ and Ce 4+ were previously proposed for CeCu 3 Mn 4 O 12 by BVS calculation …”

Section: Resultssupporting

confidence: 90%

“…Assuming the Ce 3+ valence state, the BVS is calculated to be +4.85, which is much higher than V f (+3 ). This observation confirms that the tetravalent states of Ce ions are predominant for all the quadruple perovskites measured, 25,38 although intermediate valences between Ce 3+ and Ce 4+ were previously proposed for CeCu 3 Mn 4 O 12 by BVS calculation. 26 Figure 3a shows the XAS spectra of the Cu L 2,3 -edge.…”

Section: Resultsmentioning

confidence: 99%

“…The obtained polycrystalline sample was washed several times with distilled water. Reference oxides for X-ray absorption measurement were synthesized according to the literature. ,− CaCu 3 Ti 4 O 12 was obtained from a stoichiometric mixture of CaCO 3 (99.9%), CuO (99.9%), and TiO 2 (99.9%) by calcining at 1273 K in air. CeCu 3 Cr 4 O 12 , CeCu 3 Mn 4 O 12 , and CeCu 3 Fe 4 O 12 were synthesized from the stoichiometric mixture of pure metal oxides or precursors made by the complex polymerized method using high-pressure and high-temperature conditions of 8–12 GPa and 1273–1473 K.…”

Section: Methodsmentioning

confidence: 99%

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A Sequential Electron Doping for Quadruple Perovskite Oxides ACu₃Co₄O₁₂ (A = Ca, Y, Ce)

et al. 2020

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A novel quadruple perovskite oxide CeCu3Co4O12 has been synthesized in high-pressure and high-temperature conditions of 12 GPa and 1273 K. Rietveld refinement of the synchrotron X-ray powder diffraction pattern reveals that this oxide crystallizes in a cubic quadruple perovskite structure with the 1:3-type ordering of Ce and Cu ions at the A-site. X-ray absorption spectroscopy analysis demonstrates the valence-state transitions in the ACu3Co4O12 series (A = Ca, Y, Ce) from Ca2+Cu3+ 3Co3.25+ 4O12 to Y3+Cu3+ 3Co3+ 4O12 to Ce4+Cu2.67+ 3Co3+ 4O12, where the electrons are doped in the order from B-site (Co3.25+ → Co3+) to A′-site (Cu3+ → Cu2.67+). This electron-doping sequence is in stark contrast to the typical B-site electron doping for simple ABO3-type perovskite and quadruple perovskites CaCu3 B 4O12 (B = V, Cr, Mn), further differing from the monotonical A′-site electron doping for Na1–x La x Mn3Ti4O12 and A′- and B-site electron doping for AMn3V4O12 (A = Na, Ca, La). The differences in the electron-doping sequences are interpreted by rigid-band models, proposing a wide variety of electronic states for the complex transition-metal oxides containing the multiple valence-variable ions.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A Sequential Electron Doping for Quadruple Perovskite Oxides ACu₃Co₄O₁₂ (A = Ca, Y, Ce)

et al. 2020

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“…CaCu 3 Cr 4 O 12 consisting of Cu 2+ (3d 9 ) and Cr 4+ (3d 2 ) ions, is an antiferromagnetic metal, 9,10) whereas LaCu 3 Cr 4 O 12 undergoes an antiferromagnetic transition simultaneously with charge transfer (3Cu (2+¤)+ + 4Cr (3.75¹0.75¤)+ 3Cu (3¹£)+ + 4Cr (3+0.75£)+ ) at 220 K, 11) followed by the ferrimagnetic metallic properties for Ce 4+ Cu 2+ 3 Cr 3.5+ 4 O 12 (T C = 333 K). 12) In their electron doping sequence, the electrons are primarily doped into the B-site Cr ions. However, the monovalent metal (A + ) substitution for the A-site and its carrier-doping manner was not examined yet.…”

Section: Introductionmentioning

confidence: 99%

High-Pressure Synthesis of a Novel Quadruple Perovskite Oxide AgCu3Cr4O12

Kato

Furo

Yamaguchi³

et al. 2023

Mater. Trans.

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A novel complex transition metal oxide AgCu 3 Cr 4 O 12 has been obtained using high-pressure and high-temperature conditions of 12 GPa and 1223 K. The crystal structure is refined to be a cubic AAA 3 B 4 O 12 -type quadruple perovskite structure based on the Rietveld refinement of the synchrotron X-ray powder diffraction data. The density-functional theory calculation obtains a metallic band structure. The valence state is estimated to be Ag ³1.3+ Cu ³2.2+ 3 Cr 4+ 4 O 12 by bond valence sum and X-ray absorption spectroscopy analyses. The valence state on ACu 3 Cr 4 O 12 series (A = Ag, Ca, La, Ce) sequentially transforms from Ag ³1.3+ Cu ³2.2+ 3 Cr 4+ 4 O 12 , Ca 2+ Cu 2+ 3 Cr 4+ 4 O 12 , La 3+ Cu (2+¤)+ 3 Cr (3.75¹0.75¤)+ 4 O 12 , to Ce 4+ Cu 2+ 3 Cr 3.5+ 4 O 12, where the electrons are doped into the AA-site (Cu ³2.2+ ¼ Cu 2+ ), followed by predominant doping into the B-site (Cr 4+ ¼ Cr (3.75¹0.75¤)+ ¼ Cr 3.5+ ). Their electron doping sequence is distinguished from those reported in other quadruple perovskite oxides, proposing characteristic features of the ACu 3 Cr 4 O 12 family.

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“…We have recently reported a new Ce-containing quadruple perovskite CeMn 3 Cr 4 O 12 . 21 Although most Cecontaining quadruple perovskites contain Ce 4+ ions, [22][23][24][25] Ce 3+ ions are included in CeMn 3 Cr 4 O 12 . CeMn 3 Cr 4 O 12 exhibits a metamagnetic-like behavior derived from the 4f magnetic moments of Ce 3+ ions with 4f 1 configuration at low temperature, in addition to the sequential antiferromagnetic transitions in Cr and Mn magnetic sublattices.…”

Section: Introductionmentioning

confidence: 99%

High‐pressure synthesis, crystal structure, and properties of a novel quadruple perovskite CeMn₃Rh₄O₁₂

Kato

Nakajima

Kawaguchi

et al. 2022

Int J Ceramic Engine & Sci

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A novel transition metal oxide CeMn3Rh4O12 has been synthesized using high‐pressure and high‐temperature conditions of 12 GPa and 1573 K. CeMn3Rh4O12 crystallizes in the AA'3B4O12‐type quadruple perovskite structure with A‐site ordering in a cubic space group of Im3¯$\bar 3$ in the high‐temperature phase at above 310 K, whereas CeMn3Rh4O12 undergoes a structural phase transition with symmetry lowering down to probable triclinic symmetry on cooling below this temperature. X‐ray absorption spectroscopy reveals that all the constituent ions are trivalent at room temperature, suggesting the valence state of Ce3+Mn3+3Rh3+4O12. Magnetization study demonstrates an antiferromagnetic transition attributed to A'‐site Mn3+ ions at TN = 35 K, whereas a Curie–Weiss analysis finds an additional paramagnetic component attributed to the Ce3+ 4f1 ions. We discuss the differences in structural and magnetic properties between CeMn3Rh4O12 and LaMn3Rh4O12, eventually proposing a possible stereochemical effect of Ce3+ on crystal structure in the quadruple perovskite.

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Crystal structure and magnetic properties of A-site-ordered quadruple perovskite CeCu3Cr4O12

Cited by 9 publications

References 33 publications

A Sequential Electron Doping for Quadruple Perovskite Oxides ACu₃Co₄O₁₂ (A = Ca, Y, Ce)

A Sequential Electron Doping for Quadruple Perovskite Oxides ACu₃Co₄O₁₂ (A = Ca, Y, Ce)

High-Pressure Synthesis of a Novel Quadruple Perovskite Oxide AgCu<sub>3</sub>Cr<sub>4</sub>O<sub>12</sub>

High‐pressure synthesis, crystal structure, and properties of a novel quadruple perovskite CeMn₃Rh₄O₁₂

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Crystal structure and magnetic properties of A-site-ordered quadruple perovskite CeCu3Cr4O12

Cited by 9 publications

References 33 publications

A Sequential Electron Doping for Quadruple Perovskite Oxides ACu3Co4O12 (A = Ca, Y, Ce)

A Sequential Electron Doping for Quadruple Perovskite Oxides ACu3Co4O12 (A = Ca, Y, Ce)

High-Pressure Synthesis of a Novel Quadruple Perovskite Oxide AgCu<sub>3</sub>Cr<sub>4</sub>O<sub>12</sub>

High‐pressure synthesis, crystal structure, and properties of a novel quadruple perovskite CeMn3Rh4O12

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A Sequential Electron Doping for Quadruple Perovskite Oxides ACu₃Co₄O₁₂ (A = Ca, Y, Ce)

A Sequential Electron Doping for Quadruple Perovskite Oxides ACu₃Co₄O₁₂ (A = Ca, Y, Ce)

High‐pressure synthesis, crystal structure, and properties of a novel quadruple perovskite CeMn₃Rh₄O₁₂