نتایج جستجو برای: clathrates
تعداد نتایج: 405 فیلتر نتایج به سال:
Silicon clathrates contain cage-like structures that can encapsulate various guest atoms or molecules. An electrochemical evaluation of type I silicon clathrates based on Ba8Al y Si46-y as the anode material for lithium-ion batteries is presented here. Postcycling characterization with nuclear magnetic resonance and X-ray diffraction shows no discernible structural or volume changes even after ...
The habitability of oceans within icy worlds depends on material and heat transport through their outer ice shells. Previous work shows a methane clathrate layer at the upper surface shell Titan thickens convecting region, while Pluto base hinders convection. In this way, dynamics clathrate-ice shells may be essential to thermal evolution ocean worlds. However, studies date have not addressed t...
While alloying is a powerful handle for materials engineering, it an ongoing challenge to navigate the large and complex parameter space of these materials. This applies in particular thermoelectrics even more so clathrates. Here, combination density functional theory calculations, alloy cluster expansions, Monte Carlo simulations, Boltzmann transport calculations used identify compositions tha...
Structural, magnetic, calorimetric and Mössbauer studies of the cooperative spin crossover naphthalene and nitrobenzene clathrates of the novel Fe(II) Hofmann-like porous metal-organic framework {Fe(bpb)[Pt(CN)4]}·2Guest are described (bpb = bis(4-pyridyl)butadiyne).
Room-temperature Raman-scattering spectra are reported for the type-II superconductors MxBaySi46 ~M 5Na,K! that were recently shown to exhibit Tc’s ;3.5 K. These spectra are compared to those of Na8Si46 and K7Si46 clathrates that exhibit normal metallic behavior down to 2 K. In the Si46 system, fifteen of the eighteen Si related first-order Raman frequencies predicted by group theory have been ...
Systematic studies in the systems Cs–Na–Ga–Si, Rb–Na–Ga–Si, and Rb–Na–Zn–Si yielded the novel type-I clathrates with refined compositions Cs6Na2Ga8.25Si37.75(3), Rb6.34Na1.66(2)Ga8.02Si37.98(3), and Rb5.20Na2.80(4)Zn3.85Si42.15(2) (cubic, Pm3 n ), as well as the type-II clathrates with formulae Cs8Na16Ga22.7Si113.3(1), Rb8.4Na15.6(1)Ga19.6Si116.4(1), and Rb8Na16Zn8.4Si127.6(1) (cubic, Fd3...
Abstract The volumetric thermal expansion coefficient α V is discussed in relation to the bulk modulus B 0 for transition-metal disilicides (TrSi 2 ), alkaline-Earth metal (AeSi Mg Si, and Si clathrates. For this purpose, of CoSi at 300 K determined be 3.1 × 10 −5 −1 using powder X-ray diffraction measurements temperatures ranging from 835 K. AeSi have values 27.9 52.9 GPa, while range 3.2 4.8 ...
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