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Chemical compound From Wikipedia, the free encyclopedia
Manganese disilicide (MnSi2) is an intermetallic compound, a silicide of manganese. It is a non-stoichiometric compound, with a silicon deficiency expressed as MnSi2–x. Crystal structures of many MnSi2–x compounds resemble a chimney ladder and are called Nowotny phases. They include MnSi2 (x=0), Mn4Si7 (x=0.250), Mn11Si19 (x=0.273), Mn15Si26 (x=0.267) and Mn27Si47 (x=0.259). These phases have very similar unit cells whose length varies from 1.75 nm for MnSi2 or Mn4Si7, which have almost the same structures, to 11.8 nm for Mn27Si47.[5]
Electron micrograph of MnSi2 stars grown on Si plates | |
Names | |
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IUPAC name
Manganese disilicide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.031.606 |
EC Number |
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PubChem CID |
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Properties | |
MnSi2 | |
Molar mass | 111.109 g/mol |
Appearance | gray crystals[1] |
Melting point | 1,152 °C (2,106 °F; 1,425 K)[1][2] dec. |
0.7×10−6 emu/g (MnSi1.72)[3] | |
Structure | |
Tetragonal[4] | |
P4c2 (No. 116), tP44 | |
a = 0.5518 nm, c = 1.7449 nm | |
Formula units (Z) |
4 |
Hazards | |
Flash point | Non-flammable |
Related compounds | |
Other cations |
Cobalt disilicide Iron disilicide Titanium disilicide |
Related compounds |
Manganese monosilicide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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MnSi2–x Nowotny phases have a Mn sublattice with a β-tin structure overlaid with a face-centered cubic Si sublattice. They resemble chimneys of transition metal atoms containing spiraling ladders of Si. These phases are semiconductors with a band gap of 0.4 to 0.9 eV. They exhibit a reasonably high thermoelectric figure of merit ZT ~ 0.8 and have potential applications in thermoelectric generators.[5]
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