Synthesis, structures, and phase transitions of barium bismuth iridium oxide perovskites Ba2BiIrO6 and Ba3BiIr2O9

Ling, Chris D.; Kennedy, Brendan J.; Zhou, Qingdi; Spencer, Jarrah R.; Avdeev, Maxim

doi:10.1016/j.jssc.2010.01.017

Cited by 18 publications

(15 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The monoclinic model yields a slight canting with respect to the a axis in the corner-sharing octahedra and the face-sharing clusters of 7.3° and −3.3°, respectively (Figure ). Similar canting is seen in Ir octahedra in Ba 3 BiIr 2 O 9 and Ba 3 NdIr 2 O 9 . , Figure shows a comparison of bond angles and distances for the reported model and from this work. When the Ir–O and In–O bond distances from the two models are compared with calculated lengths based on Shannon radii (1.97 and 2.14 Å, respectively), the bond lengths from our refinements are more reasonable than those from the previously reported model.…”

Section: Resultssupporting

confidence: 74%

Structure and Properties of Ir-Containing Oxides with Large Spin–Orbit Coupling: Ba₂In_2–xIr_xO_5+δ

Flynn

Sleight

et al. 2016

Inorg. Chem.

View full text Add to dashboard Cite

In this work, the solid solution series Ba2In(2-x)Ir(x)O5+δ (x = 0-1.4, 2) was synthesized, and its structural, magnetic, and charge-transport properties were measured. With increasing Ir content, three transitions in the room-temperature structure were observed: orthorhombic to tetragonal to cubic to a monoclinic distortion of a hexagonal BaTiO3 structure. Neutron diffraction shows Ba2In(1.6)Ir(0.4)O5.4 to be cubic and Ba2InIrO6 to be monoclinic, the latter contrary to previously published X-ray diffraction refinements. Magnetization measurements show Curie-Weiss behavior for x = 0.2-0.6, which arises from nearly 50:50 ratio of Ir(V) and Ir(VI). To our knowledge, this is the first time Ir(VI) has been stabilized with standard solid-state methods under ambient conditions. The electrical resistivity measurements show all the compounds studied are semiconducting and that resistivity decreases with increasing Ir content, suggesting the proximity to a metal-insulator transition. A sign reversal in the high-temperature Seebeck coefficient is observed indicating both electron and hole charge transport.

show abstract

Section: Resultssupporting

confidence: 74%

Structure and Properties of Ir-Containing Oxides with Large Spin–Orbit Coupling: Ba₂In_2–xIr_xO_5+δ

Flynn

Sleight

et al. 2016

Inorg. Chem.

View full text Add to dashboard Cite

show abstract

“…On the downside, hexagonal perovskites are prone to structural distortions 276 sometimes accompanied by tangible disorder. 277 In mixedvalence systems, charge-transfer or charge-ordering processes may additionally occur. [278][279][280] E. Other materials…”

Section: Hexagonal Perovskitesmentioning

confidence: 99%

Models and materials for generalized Kitaev magnetism

Winter

Tsirlin

Daghofer

et al. 2017

J. Phys.: Condens. Matter

553

522

View full text Add to dashboard Cite

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.

show abstract

“…However, at 3.4 K peak splitting of the 203 and 204 reflections, as well as a visible broadening of other peaks, indicated that the symmetry is reduced to monoclinic. The 3.4 K data were refined in the C2/c space group similar to other hexagonal perovskites [28,29,34]. Both hexagonal and monoclinic structures feature a single crystallographic position of Ir (Tables I and II) suggesting the true intermediate-valence Ir 4.5+ state.…”

Section: A Crystal Structurementioning

confidence: 99%

Persistent low-temperature spin dynamics in the mixed-valence iridate Ba3InIr2O9

et al. 2017

View full text Add to dashboard Cite

Using thermodynamic measurements, neutron diffraction, nuclear magnetic resonance, and muon spin relaxation, we establish putative quantum spin liquid behavior in Ba3InIr2O9, where unpaired electrons are localized on mixed-valence Ir2O9 dimers with Ir 4.5+ ions. Despite the antiferromagnetic Curie-Weiss temperature on the order of 10 K, neither long-range magnetic order nor spin freezing are observed down to at least 20 mK, such that spins are short-range-correlated and dynamic over nearly three decades in temperature. Quadratic power-law behavior of both spin-lattice relaxation rate and specific heat indicates gapless nature of the ground state. We envisage that this exotic behavior may be related to an unprecedented combination of the triangular and buckled honeycomb geometries of nearest-neighbor exchange couplings in the mixed-valence setting. *

show abstract

Synthesis, structures, and phase transitions of barium bismuth iridium oxide perovskites Ba2BiIrO6 and Ba3BiIr2O9

Cited by 18 publications

References 25 publications

Structure and Properties of Ir-Containing Oxides with Large Spin–Orbit Coupling: Ba₂In_2–xIr_xO_5+δ

Structure and Properties of Ir-Containing Oxides with Large Spin–Orbit Coupling: Ba₂In_2–xIr_xO_5+δ

Models and materials for generalized Kitaev magnetism

Persistent low-temperature spin dynamics in the mixed-valence iridate Ba3InIr2O9

Contact Info

Product

Resources

About

Synthesis, structures, and phase transitions of barium bismuth iridium oxide perovskites Ba2BiIrO6 and Ba3BiIr2O9

Cited by 18 publications

References 25 publications

Structure and Properties of Ir-Containing Oxides with Large Spin–Orbit Coupling: Ba2In2–xIrxO5+δ

Structure and Properties of Ir-Containing Oxides with Large Spin–Orbit Coupling: Ba2In2–xIrxO5+δ

Models and materials for generalized Kitaev magnetism

Persistent low-temperature spin dynamics in the mixed-valence iridate Ba3InIr2O9

Contact Info

Product

Resources

About

Structure and Properties of Ir-Containing Oxides with Large Spin–Orbit Coupling: Ba₂In_2–xIr_xO_5+δ

Structure and Properties of Ir-Containing Oxides with Large Spin–Orbit Coupling: Ba₂In_2–xIr_xO_5+δ