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- W2014948224 abstract "A partially Cr-substituted solid solution of a higher manganese silicide, (Mn 1- x Cr x )Si γ , has been prepared by an arc-melting method and a subsequent annealing process. The compound consists of two tetragonal subsystems of [Mn 1- x Cr x ] and [Si] with an irrational c -axis ratio, γ= c Mn / c Si . According to Vegard's rule, the solubility limit of Cr is determined at x = 0.20. With increasing Cr content x from 0 to 0.20, equivalent to increasing the hole carrier concentration, the a - and c Mn -axis lengths linearly increase, while the c Si -axis length gradually decreases. As expected from a valence electron counting rule, the electrical conductivity of (Mn 1- x Cr x )Si γ increases with increasing x from 334 S·cm -1 ( x = 0) to 727 S·cm -1 ( x = 0.20) at room temperature. The Cr-substituted samples undergo a microscale domain separation; the sample with a nominal composition of x = 0.20 consists of Cr-rich ( x ∼0.3) and Mn-rich ( x ∼0.1) dendritic domains with a typical size of ∼100 µm. Despite the substantial increase in electrical conductivity, the total thermal conductivity decreases with increasing x owing to a marked reduction in lattice contribution. As a consequence, the dimensionless figure-of-merit ZT increases from 0.28 ( x = 0) at 800 K to 0.45 ( x = 0.20) at 900 K." @default.
- W2014948224 created "2016-06-24" @default.
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- W2014948224 date "2012-07-12" @default.
- W2014948224 modified "2023-10-14" @default.
- W2014948224 title "Enhanced Thermoelectric Performance of a Chimney-Ladder (Mn<sub>1-x</sub>Cr<sub>x</sub>)Si<sub>γ</sub> (γ∼1.7) Solid Solution" @default.
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- W2014948224 doi "https://doi.org/10.1143/jjap.51.085801" @default.
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