The crystal structure of Mn15Si26

Superspace Group Approach to the Crystal Structure of Thermoelectric Higher Manganese Silicides MnSi

“…The solid lines in these panels correspond to those shown in Fig. 5 but the x and y lines are interchanged to preserve the original (x, y) coordinates given in the reports (Flieher et al, 1967;Gottlieb et al, 2003;Knott et al, 1967;Schwomma et al, 1963;1964;Zwilling & Nowotny, 1973). All the x and y coordinates of the points in the [Si] subsystem are well superposed on the two universal lines, suggesting that the helical arrangement of Si atoms is almost identical and independent of the γ values in all HMSs.…”

“…The numbers in parentheses represent the estimated standard deviation of the last significant digit. The resulting c-axis ratio was γ = 1.7326(1), different from that of any commensurate HMSs (Flieher et al, 1967;Gottlieb et al, 2003;Knott et al, 1967;Schwomma et al, 1963;1964;Zwilling & Nowotny, 1973) and that for the sample annealed at 1273 K for 168 h from the same batch of the present sample of γ = 1.7361(1) (Miyazaki, 2008). Table 2.…”

“…73) (Flieher et al, 1967;Knott et al, 1967) and Mn 27 Si 47 (γ =1.7407) (Zwilling & Nowotny, 1973) are converted into the respective marks as shown in Fig. 8.…”

“…The compounds exhibit ZT = 0.3-0.7 at around 800 K (Fedorov & Zaitsev, 2006), but different structure formulae, e.g., Mn 4 Si 7 (Gottlieb et al, 2003), Mn 11 Si 19 (Schwomma et al, 1963;1964), Mn 15 Si 26 (Flieher et al, 1967;Knott et al, 1967), Mn 27 Si 47 (Zwilling & Nowotny, 1973), were proposed as HMS phases. Figure 1 shows the crystal structures (Momma & Izumi, 2008) of the first three of these; all three have great resemblance apart from the c-axis length.…”

X-ray absorption study of the electronic structure of Mn-doped amorphous Si

“…Mn metallic clusters are excluded by previous materials characterization [7]. The atomic density obtained from Rutherford backscattering and film thickness measurements increases linearly with Mn doping x, suggesting that Mn are at interstitial-like positions with high Si coordination numbers, as in other crystalline MnSi silicides [13,16]. The Mn centers and Mn-Si covalent bonds can lead to delocalized states and the formation of an itinerant impurity band.…”