The crystal structure of Rb2Ti2O5

Federicci, Rémi; Finocchi, Fabio; Popa, Florin; Brohan, Luc; Béneut, Keevin; Giura, P.; Rousse, Gwenaëlle; Descamps‐Mandine, Armel; Douillard, Thierry; Shukla, Abhay; Léridon, Brigitte

doi:10.1107/s2052520617013646

Cited by 5 publications

(4 citation statements)

References 28 publications

(28 reference statements)

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“…In the present paper we aim at investigating the electrical properties of K 2 Ti 2 O 5 in comparison with the exceptional properties of the parent compound Rb 2 Ti 2 O 5 such as 10 9 dielectric constant and 0.1-C cm −1 electrical polarization [12,13] . The fact that K is more abundant and eco-friendly than Rb makes it an ideal candidate for supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Colossal dielectric constant in K2Ti2O5

Rani

Coutinho²,

Holé³

et al. 2020

Materials Letters

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Section: Introductionmentioning

confidence: 99%

Colossal dielectric constant in K2Ti2O5

Rani

Coutinho²,

Holé³

et al. 2020

Materials Letters

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“…The third transition is more relevant since Rb 2 TiO 3 and Rb 2 Ti 2 O 5 have both been experimentally characterized. 93,94 There are also two Fe-based candidates that both involve a pair of perovskites,…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Three of these also feature RbFe 11 O 17 , of which little is known except that it has a magnetoplumbite structure, The two first cases are questionable, however, since Fe 2 CuO 4 decomposes already at 500 °C while there is no reference of RbMnO 3 in the literature. The third transition is more relevant since Rb 2 TiO 3 and Rb 2 Ti 2 O 5 have both been experimentally characterized. , …”

Section: Resultsmentioning

confidence: 99%

Discovery of Oxygen Carriers by Mining a First-Principle Database

et al. 2023

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Chemical looping is an innovative technique that relies, to a large extent, on the possibility of finding new oxygen carriers. Until now, these materials have primarily been identified via experimental techniques and therefrom derived insights. However, this is both costly and time-consuming. To speed-up this process, we have applied a computational screening approach based on energetic data retrieved from the Open Quantum Materials Database. In particular, we have considered combinations of all mono-, bi-, and trimetallic alloys and mixed oxides with up to three distinctive phases. Here, we specifically focus on a technique referred to as chemical looping oxygen uncoupling, which is especially suitable for solid fuels, e.g., combustion of biomass for negative CO 2 emissions. The formation energies obtained for the materials of interest were used to identify phase transitions that are likely to occur under conditions relevant for chemical looping oxygen uncoupling. Given these criteria, the initial list of 300000 materials is reduced by a factor of 20, and after filtering out rare, radioactive, toxic, or harmful elements only 1000 remain. When considering the abundance of elements in the ranking criteria, most of the highest ranking phases include Cu, Mn, and Fe. This adds credibility to the procedure, as many viable oxygen carriers for chemical looping oxygen uncoupling that have been studied experimentally contain these elements. While Cr-based materials have not been widely explored for this application, our study suggests that this might be worthwhile since these occur more frequently than Fe. Other elements that would be interesting as additional components include Ba, K, Na, Al, and Si.

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“…The possibility of a conventional ferroelectric phase associated to a structural phase transition was completely discarded by Raman spectroscopy and XRD measurements. Indeed, RTO structure was found to remain consistent with the centrosymmetric C2/m space group between 10 K and 450 K 15 .…”

Section: Introductionmentioning

confidence: 84%

Memory effects in the ion conductor Rb2Ti2O5

Federicci

Holé

Démery

et al. 2018

Journal of Applied Physics

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Recent studies on Rb 2 Ti 2 O 5 crystals have demonstrated remarkable electrical properties. This material exhibits colossal electrical polarization between 200 K and 330 K. In the present work, we report on the observation of memory effects in Rb 2 Ti 2 O 5 due to charge accumulation and we discuss the genuine memristive character of this material. An analytical model is proposed for the system, which takes into account the ionic diffusion and ionic migration and is in good agreement with the observed volatile memristive properties of the material.

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The crystal structure of Rb₂Ti₂O₅

Cited by 5 publications

References 28 publications

Colossal dielectric constant in K2Ti2O5

Colossal dielectric constant in K2Ti2O5

Discovery of Oxygen Carriers by Mining a First-Principle Database

Memory effects in the ion conductor Rb2Ti2O5

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