Tetragonal Distortion of NiRh<sub>2</sub>O<sub>4</sub>

Horiuti, Sumiko; Miyahara, Syôhei

doi:10.1143/jpsj.19.423

Cited by 15 publications

(14 citation statements)

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“…This computed value corresponds to the reported partial molar values of absorbed COP gas in certain organic liquids. 20 The sorptive equivalence between elastomers and liquids proposed earlier by various researchers seems to be valid. 'p3 Further, the value determined by Fleming and Koros' for CO, gas in a silicone elastomer for a pressure range of 0-5 MPa is ca.…”

Section: Partial Molar Volumementioning

confidence: 88%

Interaction of CO₂ gas with silicone elastomer at high ambient pressures

Briscoe

Zakaria

1991

J Polym Sci B Polym Phys

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Interaction of high‐pressure CO2 gas with a silicone elastomer, and to a lesser extent, with a nitrile rubber and a PTFE have been investigated. Sorptive dilations of the polymers were measured with the help of custom‐made piezoelectric ultrasonic transducers under gas pressures of up to ca. 22 MPa at 42°C. The gas mass sorption was determined by a vibrating reed probe. For the silicone elastomer system the dilation isotherm mimics the sorption isotherm. The partial molar volume (PMV) of the absorbed CO2 gas in the silicone elastomer has been computed. A significant drop in the PMV value is observed when the CO2 gas becomes supercritical. In the transition region, the transmission of ultrasonic signals through the specimen indicated the formation of discrete small (estimated as about 60 μm in diameter) high density zones of CO2 in the rubber matrix. The plasticization effects of the absorbed high pressure CO2 gas have been identified from the interpretation of the changes in the acoustic longitudinal modulus obtained from ultrasonic transmission measurements. The effects of rapid gas decompression on the structural integrity of the various polymers have also been determined. Significant inflation of certain specimens occur toward the latter stages of the decompression cycle. The initiation and development of internal cracks or bubbles was followed by monitoring the ultrasonic signal attenuation.

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Section: Partial Molar Volumementioning

confidence: 88%

Interaction of CO₂ gas with silicone elastomer at high ambient pressures

Briscoe

Zakaria

1991

J Polym Sci B Polym Phys

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“…We show that QCT-PT can be observed in the potential-induced O 2 reduction process on Pt electrode in alkaline solution, when four hydroxide ions are produced by transferring four electrons and four protons supplied from two water molecules into dioxygen: ratio k H /k D (≡ K H/D ). By measuring K H/D , we can clarify the nature of the PT processes because the replacement of hydrogen by deuterium can considerably affect the reaction rates of electrode processes [19][20][21][22]. We show that K H/D = 32 for O 2 reduction on Pt in alkaline condition and this value drops down to 3.7 as a function of the potential.…”

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confidence: 88%

Quantum-to-Classical Transition of Proton Transfer in Potential-Induced Dioxygen Reduction

et al. 2018

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We report an observation of a quantum tunneling effect in a proton-transfer (PT) during potential-induced transformation of dioxygen on a platinum electrode in a low overpotential (η) region at 298 K. However, this quantum process is converted to the classical PT scheme in high η region. Therefore, there is a quantum-to-classical transition of PT (QCT-PT) process as a function of potential, which is confirmed by theoretical analysis. This observation indicates that the quantum-tunneling governs the multistep electron-proton-driven transformation of dioxygen in low η condition.

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“…Previous reports on the synthesis and physical properties of NiRh 2 O 4 are scant. They suggest that, at elevated temperatures, NiRh 2 O 4 adopts the ideal cubic spinel structure, but that at T ∼ 380 K it undergoes a cubic-to-tetragonal phase transition [39], possibly associated with a Jahn-Teller (JT) distortion of the Ni 2+ ions [40]. Previous studies have indicated the possibility of magnetic ordering at T N = 18 K, however the rollover in the susceptibility is broad [41].…”

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confidence: 99%

Frustrated spin one on a diamond lattice in NiRh2O4

Chamorro

Flynn

et al. 2018

Phys. Rev. Materials

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We report the discovery of a spin one diamond lattice in NiRh2O4. This spinel undergoes a cubic to tetragonal phase transition at T = 440 K that leaves all nearest neighbor interactions equivalent. In the tetragonal phase, magnetization measurements show a Ni 2+ effective moment of p eff = 3.3(1) and dominant antiferromagnetic interactions with ΘCW = -11.3(7) K. No phase transition to a longrange magnetically ordered state is observed by specific heat measurements down to T = 0.1 K. Inelastic neutron scattering measurements on sub-stoichiometric NiRh2O4 reveal possible valencebond behavior and show no visible signs of magnetic ordering. NiRh2O4 provides a platform on which to explore the previously unknown and potentially rich physics of spin one interacting on the diamond lattice, including the realization of theoretically predicted quantum spin liquid and topological paramagnet states. arXiv:1701.06674v2 [cond-mat.str-el]

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Tetragonal Distortion of NiRh₂O₄

Cited by 15 publications

References 1 publication

Interaction of CO₂ gas with silicone elastomer at high ambient pressures

Interaction of CO₂ gas with silicone elastomer at high ambient pressures

Quantum-to-Classical Transition of Proton Transfer in Potential-Induced Dioxygen Reduction

Frustrated spin one on a diamond lattice in NiRh2O4

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Tetragonal Distortion of NiRh2O4

Cited by 15 publications

References 1 publication

Interaction of CO2 gas with silicone elastomer at high ambient pressures

Interaction of CO2 gas with silicone elastomer at high ambient pressures

Quantum-to-Classical Transition of Proton Transfer in Potential-Induced Dioxygen Reduction

Frustrated spin one on a diamond lattice in NiRh2O4

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About

Tetragonal Distortion of NiRh₂O₄

Interaction of CO₂ gas with silicone elastomer at high ambient pressures

Interaction of CO₂ gas with silicone elastomer at high ambient pressures