Floating zone growth and characterization of semiconducting Ru2Si3 single crystals

Directional thermoelectric properties of Ru2Si3

“…For the low temperature Ru 2 Si 3 phase, Perring et al [25] report a Ru-rich composition deviation to w59% Si, which is consistent with the report of Souptel et al of 'silicon plate-like precipitates' formed in floating zonegrown crystals [9]. The exact interrelationship between the HT4LT phase transformation and the deviation of Ru 2 Si 3 from 2:3 stoichiometry remains unknown, although a solubility range for Ru 2 Si 3 has been proposed [9], and this is supported by measurements at 1673 K [26].…”

“…Ruthenium sesquisilicide, Ru 2 Si 3 , has attracted attention over the past decade [1][2][3][4][5][6][7][8][9][10][11][12][13] as a potential thermoelectric material for use at high temperatures. This interest has been stimulated by the prediction of greatly enhanced thermoelectric performance of Ru 2 Si 3 over that currently attainable with conventional Si-Ge alloys for use in thermoelectric generators.…”

“…Recent single crystal studies of both undoped [9] and doped [8,13] Ru 2 Si 3 grown via the floatingzone method have reported thermoelectric or electronic properties without regard to crystal orientation, despite the implied anisotropy of properties due to crystal structure and shown by modeled band structures. In order to clarify the magnitude of what these orientation effects might be, the authors have chosen to examine the crystallographic orientation effects on the thermoelectric properties of Ru 2 Si 3 .…”

Structural and Thermoelectric Properties of Chimney–Ladder Compounds in the Ru-Mn-Si System

“…1 Some of the family of compounds with the chimney-ladder structures, including high manganese silicides (Mn 4 Si 7 , Mn 11 Si 19 , Mn 15 Si 26 , and so forth [2][3][4], are known to exhibit a high Seebeck coefficient and low thermal conductivity. The chimney-ladder compounds have been investigated as candidate thermoelectric materials, [5][6][7][8] because thermoelectric performance is evaluated by the dimensionless figure of merit ZT = a 2 T/(qk), where a, q, k, and T are the Seebeck coefficient, electrical resistivity, thermal conductivity, and temperature, respectively. The chimneyladder compounds expressed by the general chemical formula M n X 2nÀm (M: transition-metal element, X: group 13 or 14 element, n, m: integers) possess a particular tetragonal crystal structure in which the unit cell consists of M (Ru) and X (Si) subcells.…”

Environmental-friendly thermoelectric materials

“…Fedorov M. I [13] also added that crystal structure of Ru2Si3 is similar to high manganese silicide with plate-like precipitates. In terms of the directional axis, in the reference of β-Ru2Si3 by Poutcharovsky et al [129], the plate-like precipitates of Ru2Si3 were orthogonal to [010] axis while according to Souptel et al [130], the precipitates were orthogonal to either [100] or [001]. Figure 15 and 16 below shows the thermoelectric properties of crystal structure of Ru2Si3 with [010] direction measured by Simkin et al [14].…”