Single parabolic band behavior of thermoelectric p-type Cu4Mn2Te4

Rational Design of Spinel-Type Cu4Mn2Te4/TMTe (TM = Co, Ni) Composites with Synergistically Manipulated Electrical and Thermal Transport Properties

“…Apparently, electrical conductivity decreases as the temperature increases, implying stronger electron scattering. Cu 4 Mn 2 Te 4 shows σ = 2070 Ω −1 cm −1 at 325 K, which compares well with σ = 1765 Ω −1 cm −1 for Cu 4 Mn 2 Te 4 reported by Chen et al 41 Comparable results have also been reported by Li et al 42 At 325 K, as the Co content becomes higher, σ decreases from 2070 Ω −1 cm −1 for x = 0 to 1370 Ω −1 cm −1 for x = 0.2, and further to 1060 Ω −1 cm −1 for x = 0.3. Hall effect results manifested that the carrier concentration is relatively high (=2.87 × 10 21 cm −3 ) for x = 0 and drops to 1.57−1.66 × 10 21 cm −3 for x = 0.2, 0.3, and 0.4, as shown in Table 1.…”

“…42 They also revealed the underlying physics of Cu 4 Mn 2 Te 4 , such as deformation potential and density of effective mass. 42 To the best of our knowledge, no systematic work on transition-metal-added Cu 4 Mn 2 Te 4 has been performed. Here we demonstrate the effectiveness of introducing the representative transition metals Co/Ni with regards to boosting figure of merit and conversion efficiency and analyze the underlying mechanism, with an aim toward further developing the applicability of spinel chalcogenides.…”

Promising Zintl-Phase Thermoelectric Compound SrAgSb

“…The lattice thermal conductivity κ L was obtained by subtracting the carrier contribution κ c from the total thermal conductivity κ. The κ c was estimated using the Wiedemann–Franz relationship (κ c = L σ T ), where L is the Lorenz number and calculated using a single parabolic band (SPB) model, ,, the detailed formulas are listed in the Supporting Information. As shown in the inset to Figure a, the lattice thermal conductivity of EuAgSb and EuCuSb is lower than that of SrAgSb at higher temperature, which is probably because of the heavier Eu atoms for the stronger phonon scattering.…”

“…As shown in Figure c, the total thermal conductivity of Sr x AgSb obviously decreases with increasing Sr content. The carrier thermal conductivity (κ c ), which is calculated by κ c = L σ T (where L is the Lorenz number estimated based on the SPB model ,, ), and the lattice thermal conductivity, which is calculated by κ L = κ – κ c , are shown in Figure d. With increasing Sr content, the carrier thermal conductivity significantly decreases because of the lower carrier concentration.…”

Molecular Prevalence and Phylogenetic Characterization of Blastocystis in Cattle in Kayseri Province, Turkey

“…ST10,11,[13][14][15][16][17]21,[23][24][25][26] were only found in animals (Stensvold et al 2009;Parkar et al 2010;Valença-Barbosa et al 2019;Stensvold and Clark, 2020). Recently, various studies have shown that Blastocystis is detected among people who have close contact with animals such as animal handlers, namely zoo-keepers, research institutions, and abattoir workers (Salim et al 1999;Abe et al 2002;Parkar et al 2010;Li et al 2018). Thus, there is reported that close contact with infected animals may be important for zoonotic transmission of Blastocystis infection (Lee et al 2018).…”