Synthesis and crystal structure of the palladium oxides NaPd3O4, Na2PdO3 and K3Pd2O4

Panin, Rodion V.; Khasanova, Nellie R.; Abakumov, Artem M.; Antipov, Evgeny V.; Tendeloo, Gustaaf Van; Schnelle, Walter

doi:10.1016/j.jssc.2007.03.005

Cited by 35 publications

(21 citation statements)

References 27 publications

(36 reference statements)

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“…As a reference, we prepared metallic NaPd 3 O 4 , which possesses the same structure as CaPd 3 O 4 and SrPd 3 O 4 and can be thought of as a Na substitution level of x = 1.00. The structure of NaPd 3 O 4 has been reported previously, 40,41 and reported electric properties are in agreement with our measurements. 17,26 A higher preparation temperature than was used for Na substitution in CaPd 3 O 4 and SrPd 3 O 4 was needed for phase purity.…”

Section: Deviations From Average Structure: Compositional Heterogeneisupporting

confidence: 93%

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Lamontagne¹,

Laurita²,

Knight³

et al. 2017

Inorg. Chem.

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The cubic semiconducting compounds APd 3 O 4 (A = Ca, Sr) can be hole-doped by Na substitution on the A site and driven towards more conducting states. This process has been followed here by a number of experimental techniques in order to understand the evolution of electronic properties. While an insulator-to-metal transition is observed in Ca 1−x Na x Pd 3 O 4 for x ≥ 0.15, bulk metallic behavior is not observed for Sr 1−x Na x Pd 3 O 4 up to x = 0.20. Given the very similar crystal and (calculated) electronic structures of the two materials, the distinct behavior is a matter of interest.We present evidence of local disorder in the A = Sr materials through the analysis of the neutron pair distribution function which is potentially at the heart of the distinct behavior. Solid-state 23 Na nuclear magnetic resonance studies additionally suggest a percolative insulator-to-metal transition mechanism wherein presumably small regions with a signal resembling metallic NaPd 3 O 4 form almost immediately upon Na substitution, and this signal grows monotonically with substitution. Some signatures of increased local disorder and a propensity for Na clustering are seen in the A = Sr compounds.

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Section: Deviations From Average Structure: Compositional Heterogeneisupporting

confidence: 93%

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Lamontagne¹,

Laurita²,

Knight³

et al. 2017

Inorg. Chem.

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“…The intensity of some Bragg reflections and Warren falls in the powder patterns could not be refined in an ideal model with space group C2/c. In some previous works the fit of observed and calculated data has been improved by introducing Me + /Me 4+ exchange between the atomic sites in Me + Me 4+ 2 O 6 layers [8,11]. Li/Sn exchange resulted in a slightly improved fit but the obtained R-factors were still quite high.…”

Section: Resultsmentioning

confidence: 99%

Investigation of stacking disorder in Li₂SnO₃

Tarakina

Денисова²,

Maksimova³

et al. 2009

Z. Kristallogr. Suppl.

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A crystal structure investigation of the low temperature Li 2 SnO 3 modification has been carried out. X-ray, neutron powder and electron diffraction data showed that this compound crystallizes in a monoclinic unit cell with parameters: a = 5.3033(2)Å, b = 9.1738(3)Å, c = 10.0195(2)Å, β~100.042(2)º and has stacking disorder along the c-axis. Simulation of diffraction patterns with different stacking faults mainly reveal the presence of rotational stacking faults with a probability of about 40% .

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“…Several other A 2 T O 3 (A = Li, Na, and T = Mn, Ru, Ir, Pd) type materials are also known to adopt a similar structure. 67,[76][77][78] Like all layered structures, honeycomb iridates are prone to stacking disorder, which led to initial confusion in some early papers that described these crystals as having the C2/c space group with a different stacking sequence 64,67 or featuring the antisite Na(Li)/Ir(Rh) disorder within the C2/m space group. 68,71,79 Such assignments are likely due to artifacts arising from the description of stacking disorder within a given crystallographic symmetry, which this disorder violates.…”

Section: Synthesis and Structurementioning

confidence: 99%

Models and materials for generalized Kitaev magnetism

Winter

Tsirlin

Daghofer

et al. 2017

J. Phys.: Condens. Matter

572

522

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The exactly solvable Kitaev model on the honeycomb lattice has recently received enormous attention linked to the hope of achieving novel spin-liquid states with fractionalized Majorana-like excitations.In this review, we analyze the mechanism proposed by G. Jackeli and G. Khaliullin to identify Kitaev materials based on spin-orbital dependent bond interactions and provide a comprehensive overview of its implications in real materials. We set the focus on experimental results and current theoretical understanding of planar honeycomb systems (Na2IrO3, α-Li2IrO3, and α-RuCl3), three-dimensional Kitaev materials (β-and γ-Li2IrO3), and other potential candidates, completing the review with the list of open questions awaiting new insights.

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Synthesis and crystal structure of the palladium oxides NaPd3O4, Na2PdO3 and K3Pd2O4

Cited by 35 publications

References 27 publications

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Investigation of stacking disorder in Li₂SnO₃

Models and materials for generalized Kitaev magnetism

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Synthesis and crystal structure of the palladium oxides NaPd3O4, Na2PdO3 and K3Pd2O4

Cited by 35 publications

References 27 publications

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd3O4 (A = Ca, Sr)

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd3O4 (A = Ca, Sr)

Investigation of stacking disorder in Li2SnO3

Models and materials for generalized Kitaev magnetism

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Product

Resources

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The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Investigation of stacking disorder in Li₂SnO₃