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Here we propose a new candidate for high\u2010temperature thermoelectric materials, the type\u2010III Si<jats:sub>172\u2212<jats:italic>x<\/jats:italic><\/jats:sub>P<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>Te<jats:sub><jats:italic>y<\/jats:italic><\/jats:sub> cationic clathrate, in which the framework is composed of partially ordered silicon and phosphorus atoms, whereas tellurium atoms occupy guest positions. We show that the utmost stability of this clathrate (up to 1500\u2005K) in air is ensured by the formation of a nanosized layer of phosphorus\u2010doped silica on the surface, which prevents further oxidation and degradation. As\u2010cast (non\u2010optimized) Si\u2010P\u2010Te clathrates display rather high values of the thermoelectric figure\u2010of\u2010merit (<jats:italic>ZT<\/jats:italic>=0.24\u20130.36) in the temperature range of 700\u20131100\u2005K. These <jats:italic>ZT<\/jats:italic> values are comparable to the best values achieved for the properly doped transition\u2010metal\u2010oxide materials. The methods of the thermoelectric efficiency optimization are discussed.<\/jats:p>","DOI":"10.1002\/chem.201001990","type":"journal-article","created":{"date-parts":[[2010,10,13]],"date-time":"2010-10-13T10:11:54Z","timestamp":1286964714000},"page":"12582-12589","source":"Crossref","is-referenced-by-count":40,"title":["Bulk and Surface Structure and High\u2010Temperature Thermoelectric Properties of Inverse Clathrate\u2010III in the Si\u2010P\u2010Te System"],"prefix":"10.1002","volume":"16","author":[{"given":"Julia V.","family":"Zaikina","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takao","family":"Mori","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kirill","family":"Kovnir","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Detre","family":"Teschner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anatoliy","family":"Senyshyn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ulrich","family":"Schwarz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuri","family":"Grin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrei V.","family":"Shevelkov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2010,10,13]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-662-04569-5"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200900598"},{"key":"e_1_2_6_2_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200900598"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/nmat2090"},{"key":"e_1_2_6_4_2","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1070\/RC2008v077n01ABEH003746","volume":"77","author":"Shevelkov A. 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