Sn. se. Nyköping 2019-12-09

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The two-atom-thick SnSe slabs are corrugated, creating a zig-zag accordion-like projection along the b axis. To be isomorphous, two substances must have the same chemical formulation, and they must contain atoms with corresponding chemical properties and with similar atomic radii. Contrary to the bulk SnSe, they have the cubic crystal structure. However, it is not the most stable of the chalcogenide solid-state lubricants, as has much weaker interplanar bonding, is highly chemically inert and has high stability in high-temperature, high-vacuum environments. SnSe would serve as the p-type semiconductor leg. Journal of Materials Chemistry A.

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Each leg is composed of a specific material that is optimized at the operating temperature range of interest. The structure contains highly distorted SnSe 7 coordination polyhedra, which have three short and four very long Sn—Se bonds, and a lone pair of the Sn 2+ sterically accommodated between the four long Sn—Se bonds. The poor ability to carry heat through its lattice enables the resulting record high thermoelectric conversion efficiency. However, at ~750 K, it undergoes a phase transition that results in a higher symmetry Cmcm structure. Within these double layers, each tin atom is covalently bonded to three neighboring selenide Se atoms, and each selenide atom is covalently bonded to three neighboring tin atoms. While historically, and have been used, these materials have suffered from heat conduction through the material. This means heat can only travel due to hot carriers an effect that can be approximated by the , a heat transport mechanism that is much less significant to the total thermal conductivity.

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The double layers are then held together primarily by. Problems with the composition are encountered during synthesis. The dynamic structural behavior of SnSe involving the reversible phase transition helps to preserve the high power factor. The Journal of Physical Chemistry C. Crystalline 2×2-atom SnSe nanowire inside a single-wall tube diameter ~1 nm A few-atom-thick SnSe nanowires can be grown inside narrow ~1 nm diameter single-wall by heating the nanotubes with SnSe powder in vacuum at 960 °C.

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While cooling from its high-temperature, higher symmetry phase space group Cmcm, 63 , SnSe undergoes a displacive shear phase transition at ~750—800 K, resulting in a lower symmetry Pnma 62 space group. When coupled with the for heat conversion, the overall energy conversion efficiency of approximately 25%. In SnSe, the ability of crystal vibrations also known as to propagate through the material is significantly hampered. At room temperature, the crystal structure of SnSe is Pnma. Specific nanostructures can be synthesized, but few 2D nanostructures have been prepared.

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Tin selenide, also known as stannous selenide, is an inorganic compound with the formula , where Tin has a +2 oxidation state. Two phases exist—the hexagonal SnSe 2 phase and the orthorhombic SnSe phase. Historically, phase-controlled synthesis of 2D tin selenide nanostructures is quite difficult. . The easy cleavage in this system is along the 100 planes. This phase transition preserves many of the advantageous transport properties of SnSe. Adam; Trewhitt, Harrison; Goel, Sanam; Liu, Zheng; Suenaga, Kazu; Giusca, Cristina; Kashtiban, Reza J.

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This idea can be paralleled with the idea of a posture-pedic mattress that does not transfer vibrations laterally. Both square SnSe nanostructures and single-layer SnSe nanostructures have been prepared. There are two-atom-thick SnSe slabs along the b—c plane with strong Sn—Se bonding within the plane of the slabs, which are then linked with weaker Sn—Se bonding along the a direction. In order for this thermoelectric process to work, a thermoelectric generator must take advantage of the temperature difference experienced by two legs of a thermocouple junction. Enhancement in the figure of merit above a relatively high value of 2.

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Thus the hot end can stay hot while the cold end remains cold, maintaining the temperature gradient needed for thermoelectric device operation. In 2014, a team at has established the world record performance for thermoelectric material efficiency. Physics of the Solid State. . . .

Tin selenide

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