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Crystal structure, electronic structure and thermoelectric (TE) properties of Nowotny chimneyladder (NCL) higher manganese silicides (HMSs) are reviewed. According to a (3+1)dimensional superspace approach, HMSs are revealed to belong to incommensurate composite crystals, wherein [Mn] and [Si] subsystems possess an irrational caxis ratio g=cMn/cSi. The g parameter, also represents a stoichiometry of the HMSs as MnSig, dictates the electronic structure, directly relating to a valence electron counting number, VEC. The ptype TE performance can be enhanced by a partial substitution of V, Cr, etc., while ntype HMSs can be obtained by heavily substituting Mn with Fe, etc., to realize VEC>14. A unique thermal expansion has been discovered at T~800 K, which would deteriorate TE performance and hence to be avoided from a practical application point of view. [doi:10.2320/jinstmet.JA201508]

Crystal Structure and Thermoelectric Properties of Chimney-Ladder Higher Manganese Silicides