Structural and magnetic properties of the (Bi2−xPrx)Ru2O7 pyrochlore solid solution (0≤x≤2)

Zouari, Sami; Ballou, R.; Cheikhrouhou, A.; Strobel, Pierre

doi:10.1016/j.jallcom.2008.09.106

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…The pyrochlores showed an increase in the lattice parameter due to B ‐site substitution of noble metal with the post transition metal 19, 20. The well described linear relationship between the lattice parameters (as determined above) and composition of extended pyrochlores in the literature,18, 19, 25 allow us to estimate formulae of Bi 2 [Ru 1.53 Bi 0.47 ]O 7‐δ (Bi/Ru = 1.61) and Pb 2 [Ru 1.73 Pb 0.27 ]O 6.5 (Pb/Ru = 1.31) for PRO and BRO respectively. EDX analyses agree very well with these values (Supporting Information (SI), Figure S1): ratios of Bi/Ru and Pb/Ru were 1.59 and 1.34 respectively.…”

Section: Resultsmentioning

confidence: 56%

Oxide Catalysts for Rechargeable High‐Capacity Li–O₂ Batteries

Nazar

2012

Advanced Energy Materials

175

143

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Nano‐crystalline mixed metal oxides with an expanded pyrochlore structure are synthesized by a chemical precipitation route in alkaline media. The high concentration of surface active sites afforded by their high surface area, intrinsically variable oxidation state and good electron transport lead to promising electrocatalytic properties for oxygen evolution in Li‐O2 cells, yielding rechargeable discharge capacities over 10 000 mAh g−1 and lowering anodic overpotentials significantly. The discharge capacity of the Li‐O2 cell is increased further when a small amount of gold is deposited on the pyrochlore oxide, which serves as a more efficient oxygen reduction catalyst. The amount of catalyst necessary for oxygen evolution performance is reduced to as little as 5 wt% by supporting the highly‐divided pyrochlore oxide crystallites on carbon using in‐situ deposition methods.

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Section: Resultsmentioning

confidence: 56%

Oxide Catalysts for Rechargeable High‐Capacity Li–O₂ Batteries

Nazar

2012

Advanced Energy Materials

175

143

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“…The magnetic susceptibility of the sample reaches its minimum value at approximately 50 K and then rapidly increases below this temperature. This increase can be attributed to the contribution of a small number of paramagnetic ions in the sample, as observed in the work of Zouari et al The presence of variable valences of Bi and Ru provides a small amount of paramagnetic ion impurities, leading to a slight increase in magnetic susceptibility at low temperatures. This can also be seen as distortion of the frustrated lattice [Bi 4 O′] network under static disordered displacement, resulting in a total magnetic moment of nonzero in Bi 2 Ru 2 O 7 .…”

Section: Resultsmentioning

confidence: 99%

Pressure-Induced Suppression of Static Disorder and Lattice Distortion in Pyrochlore Bi₂Ru₂O₇

Gai,

Qu,

Zhang

et al. 2024

J. Phys. Chem. C

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Bi 2 Ru 2 O 7 is a weak metal pyrochlore with static disorder from lone-pair electrons. The suppression of static disorder can be observed by in situ Raman spectroscopy, and the abnormal turning point in resistivity can be found at high pressure. X-ray photoelectron spectroscopy (XPS) of bismuth and ruthenium, low-temperature magnetic susceptibility, and magnetization curve were studied, indicating that there were different valence states between bismuth and ruthenium. The in situ highpressure structure evolution and conductivity in Bi 2 Ru 2 O 7 were investigated up to 30.4 and 32.7 GPa, respectively. The electronic structure evolution was studied by first-principles calculations up to 30.0 GPa. Some of the Raman peaks related to static disorder were suppressed at around 2.5 and 18.0 GPa, respectively. The [RuO 6 ] octahedron was compressed and distorted with pressure, and the triangular distortion increased in the range of 18.0 and 24.4 GPa. The high-pressure resistivity was measured by the four probe method. It slowly decreased at first and then increased slowly after 2.5 GPa due to the effects of static disorder and the applying pressure. After 18.0 GPa, the resistivity increased rapidly because of the pressure-induced lattice distortion, which led to the weakening of the conductivity of the sample under high pressure. All observations showed that the lattice distortion was influenced by the combined effects of static disorder and pressure before 18.0 GPa, which caused the resistivity to decrease first and then increase. As static disorder is suppressed, Bi 2 Ru 2 O 7 is close to standard pyrochlore and the conductivity after 18.0 GPa, which is consistent with the theoretical calculation results of band gap.

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Magnetic Properties of Rare Earth Titanates Ho2Ti2O7 and Yb2Ti2O7 Doped with Y and Bi

Nemytova,

Rinkevich,

Perov

et al. 2024

J Supercond Nov Magn

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Structural and magnetic properties of the (Bi2−xPrx)Ru2O7 pyrochlore solid solution (0≤x≤2)

Cited by 9 publications

References 18 publications

Oxide Catalysts for Rechargeable High‐Capacity Li–O₂ Batteries

Oxide Catalysts for Rechargeable High‐Capacity Li–O₂ Batteries

Pressure-Induced Suppression of Static Disorder and Lattice Distortion in Pyrochlore Bi₂Ru₂O₇

Magnetic Properties of Rare Earth Titanates Ho2Ti2O7 and Yb2Ti2O7 Doped with Y and Bi

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Structural and magnetic properties of the (Bi2−xPrx)Ru2O7 pyrochlore solid solution (0≤x≤2)

Cited by 9 publications

References 18 publications

Oxide Catalysts for Rechargeable High‐Capacity Li–O2 Batteries

Oxide Catalysts for Rechargeable High‐Capacity Li–O2 Batteries

Pressure-Induced Suppression of Static Disorder and Lattice Distortion in Pyrochlore Bi2Ru2O7

Magnetic Properties of Rare Earth Titanates Ho2Ti2O7 and Yb2Ti2O7 Doped with Y and Bi

Contact Info

Product

Resources

About

Oxide Catalysts for Rechargeable High‐Capacity Li–O₂ Batteries

Oxide Catalysts for Rechargeable High‐Capacity Li–O₂ Batteries

Pressure-Induced Suppression of Static Disorder and Lattice Distortion in Pyrochlore Bi₂Ru₂O₇