The Synthesis of [(Bi2Te3)x{(TiTe2)y}1.36] Superlattices from Modulated Elemental Reactants

Harris, Fred R.; Standridge, Stacey; Johnson, David C.

doi:10.1021/ja050799k

Cited by 20 publications

(18 citation statements)

References 13 publications

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“…27,28 Tin granules of 99.5%+ purity from Aldrich Chemicals, molybdenum rods of 99.95% purity from Alfa Aesar and amorphous selenium shot of 99.999% purity from Alfa Aesar were used as purchased. Sn and Mo were evaporated using Thermionic TM electronbeam guns and Se was evaporated using a resistively heated Knudsen cell.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Thermal Properties of Solid-State Structural Isomers: Ordered Intergrowths of SnSe and MoSe₂

et al. 2015

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A family of structural isomers [(SnSe)1.05]m(MoSe2)n were prepared using the modulated elemental reactant method by varying the layer sequence and layer thicknesses in the precursor. By varying the sequence of Sn-Se and Mo-Se layer pairs deposited and annealing the precursors to self-assemble the targeted compound, all six possible isomers [(SnSe)1.05]4(MoSe2)4, [(SnSe)1.05]3(MoSe2)3[(SnSe)1.05]1(MoSe2)1, [(SnSe)1.05]3(MoSe2)2[(SnSe)1.05]1(MoSe2)2, [(SnSe)1.05]2(MoSe2)3[(SnSe)1.05]2(MoSe2)1, [(SnSe)1.05]2(MoSe2)1[(SnSe)1.05]1(MoSe2)2[(SnSe)1.05]1(MoSe2)1, and [(SnSe)1.05]2(MoSe2)2[(SnSe)1.05]1(MoSe2)1[(SnSe)1.05]1(MoSe2)1 were prepared. The structures were characterized by X-ray diffraction and electron microscopy which showed that all of the compounds have very similar c-axis lattice parameters and in-plane constituent lattice parameters yet distinct isomeric structures. These studies confirm that the structure, order, and thickness of the constituent layers match that of the precursors. The cross-plane thermal conductivity is found to be very low (∼0.08 Wm(-1) K(-1)) and independent of the number of SnSe-MoSe2 interfaces within uncertainty. The poor thermal transport in these layered isomers is attributed to a large cross-plane thermal resistance created by SnSe-MoSe2 and MoSe2-MoSe2 turbostratically disordered van der Waals interfaces, the density of which has less variation among the different compounds than the SnSe-MoSe2 interface density alone.

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Section: Methodsmentioning

confidence: 99%

Synthesis and Thermal Properties of Solid-State Structural Isomers: Ordered Intergrowths of SnSe and MoSe₂

et al. 2015

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“…[14][15][16][17][18] Bi, Ti, Sb, and Te (99.995% or higher purity) were obtained from Alfa Aesar and used without further purification. Films were deposited at a background pressure of less than 6 × 10 −7 Torr onto polished silicon substrates.…”

Section: Methodsmentioning

confidence: 99%

“…[15][16][17][18] Binary films of Bi 2 Te 3 and Sb 2 Te 3 were prepared by depositing alternating layers of M (Bi or Sb) and Te onto a unheated substrate with a 2:3 metal:Te ratio and each pair of elemental layers was 1.01 nm thick. Binary films of TiTe 2 were prepared by depositing alternating layers of Ti and Te onto unheated substrates with a 1:2 Ti:Te atomic ratio and each pair of elemental layers was 0.65 nm thick.…”

Section: Methodsmentioning

confidence: 99%

Probing the Effects of Alloying, Grain Size, and Turbostratic Disorder on Thermal Conductivity

Mortensen¹,

Beekman²,

Johnson³

2011

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We review a synthetic strategy for investigating the various effects of thermal conductivity reducing mechanisms in thermoelectric materials. Elemental nanolaminate precursors are used to selfassemble [(Bi 1−x Sb x 2 Te 3 ] m [(TiTe 2 1 36 ] n intergrowth thin films with controlled and well-defined composition and nanostructure, allowing the influence of alloying, effective grain size, and turbostratic disorder on the cross-plane thermal conductivity to be independently and collectively assessed. By combining all three features, thermal conductivity values well below the predicted minimum thermal conductivity of the components are obtained. These approaches, potentially combined with temperature dependent measurements, can offer a useful way to study phonon scattering mechanisms in thermoelectric materials.

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“…shows the systematic change in the transport properties of (Pb 1-x Sn x Se) 1.16 (TiSe 2 ) 2 on increasing x.Figure 4ashows the temperature dependence of the resistivity ratio (/ 300K ) for polycrystalline (Pb 1-x Sn x Se 2 ) 1 16. (TiSe 2 ) 2 (0.0 ≤ x ≤ 0.6).…”

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Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb₁₋_xSn_xSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe₂

et al. 2016

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We report the characterization of the misfit compound (Pb 1-x Sn x Se 2 ) 1.16 (TiSe 2 ) 2 for 0 ≤ x ≤ 0.6, in which a [100] rocksalt bilayer of Pb 1-x Sn x Se, which is a topological crystalline insulator in bulk form, alternates with a double layer of the normally nonsuperconducting layered transition metal dichalcogenide TiSe 2 . The x dependence of T c displays a weak dome-like shape with a maximum T c of 4.5 K at x = 0.2; there is only a subtle change in Tc corresponding to the expected trivial to topological transition in the Pb 1-x Sn x Se bi-layer. We present a more detailed characterization of the superconductor at x = 0.4, for which the bulk Pb 1-x Sn x Se phase is in the topological crystalline insulator regime. For this material, the Sommerfeld parameter  = 11.06 mJ mol -1 K -2 , the Debye temperature  D = 161 K, the normalized specific heat jump value C/T c = 1.38 and the electron-phonon constant value  ep = 0.72, suggesting that (Pb 0.6 Sn 0.4 Se) 1.16 (TiSe 2 ) 2 is a BCS-type weak coupling superconductor. This material is of interest for probing the interaction of superconductivity with the surface states of a topological crystalline insulator.

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The Synthesis of [(Bi₂Te₃)_x{(TiTe₂)_y}_1.36] Superlattices from Modulated Elemental Reactants

Cited by 20 publications

References 13 publications

Synthesis and Thermal Properties of Solid-State Structural Isomers: Ordered Intergrowths of SnSe and MoSe₂

Synthesis and Thermal Properties of Solid-State Structural Isomers: Ordered Intergrowths of SnSe and MoSe₂

Probing the Effects of Alloying, Grain Size, and Turbostratic Disorder on Thermal Conductivity

Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb₁₋_xSn_xSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe₂

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The Synthesis of [(Bi2Te3)x{(TiTe2)y}1.36] Superlattices from Modulated Elemental Reactants

Cited by 20 publications

References 13 publications

Synthesis and Thermal Properties of Solid-State Structural Isomers: Ordered Intergrowths of SnSe and MoSe2

Synthesis and Thermal Properties of Solid-State Structural Isomers: Ordered Intergrowths of SnSe and MoSe2

Probing the Effects of Alloying, Grain Size, and Turbostratic Disorder on Thermal Conductivity

Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb1−xSnxSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe2

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The Synthesis of [(Bi₂Te₃)_x{(TiTe₂)_y}_1.36] Superlattices from Modulated Elemental Reactants

Synthesis and Thermal Properties of Solid-State Structural Isomers: Ordered Intergrowths of SnSe and MoSe₂

Synthesis and Thermal Properties of Solid-State Structural Isomers: Ordered Intergrowths of SnSe and MoSe₂

Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb₁₋_xSn_xSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe₂