Abstract
Molybdenum oxides MoOx in the composition range 2 ≤ x ≤ 3 were synthesized and compacted by the solid-state reaction of powdered α-MoO3 with Mo in the spark-plasma synthesis (SPS) process at temper...
Highlights
Being versatile structures with a wide range of physical and chemical properties, molybdenum oxides gain ongoing attention for the implementation into optical, electronic, catalytic, bio, and energy systems.[1,2] Most interesting for thermoelectric (TE) application is the variation of the electric and thermal transport properties of MoOx (2 ≤ x ≤ 3), which may be tunable as those of WOx compounds.[3]
Since α(T) of MoO2.750 showed some unsystematic aberration during the first heating cycle from the following cycles (Figure S7, Supporting Information), we present here the data of all second heating cycles for consistency
From six MoOx phases known in the composition range 2 < x < 3, γ-Mo4O11 (x = 2.750), Mo17O47 (x = 2.765), and Mo18O52 (x = 2.750) were synthesized via spark-plasma synthesis (SPS) as single-phase samples according to powder X-ray diffraction (PXRD) (Figure 3)
Summary
Being versatile structures with a wide range of physical and chemical properties, molybdenum oxides gain ongoing attention for the implementation into optical, electronic, catalytic, bio, and energy systems.[1,2] Most interesting for thermoelectric (TE) application is the variation of the electric and thermal transport properties of MoOx (2 ≤ x ≤ 3), which may be tunable as those of WOx compounds.[3]. With respect to a confidence interval of 99% (2.58 e.s.d.), all lattice parameters a, b and c, and the resulting unit volume V are equal (Table 3) For MoO2.750, the electrical conductivity reported for single crystals is strongly anisotropic and varies from 0.23 × 105 Sm−1 parallel to the bc plane[16] to 5−13 × 105 Sm−1 perpendicular to it.[16,25,41,42] A value of σ = 3.12 × 105 Sm−1 measured for our polycrystalline samples ranges in between, which is plausible because of approximately isotropic distribution of crystallite directions and increased scattering at grain boundaries.
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