{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,15]],"date-time":"2026-05-15T03:27:46Z","timestamp":1778815666096,"version":"3.51.4"},"reference-count":17,"publisher":"IOP Publishing","issue":"11B","license":[{"start":{"date-parts":[[2000,11,1]],"date-time":"2000-11-01T00:00:00Z","timestamp":973036800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/page\/copyright"},{"start":{"date-parts":[[2000,11,1]],"date-time":"2000-11-01T00:00:00Z","timestamp":973036800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Jpn. J. Appl. Phys."],"published-print":{"date-parts":[[2000,11,1]]},"abstract":"<jats:p> \n  An oxide single-crystalline whisker with high thermoelectric properties at temperatures (<jats:italic>T<\/jats:italic>) higher than 600 K in air has been discovered. This whisker is assigned to Ca<jats:sub>2<\/jats:sub>Co<jats:sub>2<\/jats:sub>O<jats:sub>5<\/jats:sub> phase (abbreviated to Co-225 whiskers) and has a layered structure in which Co\u2013O layers of two different kinds alternate in the direction of the <jats:italic>c<\/jats:italic>-axis. Seebeck coefficient of the whiskers is higher than 100 \u00b5V\u00b7K<jats:sup>-1<\/jats:sup> at 100 K and increases with temperature up to 210 \u00b5V\u00b7K<jats:sup>-1<\/jats:sup>. Temperature dependence of electric resistivity shows a semiconducting-like behavior. These results indicate that the electric carriers are transported via hopping conduction. Using thermal conductivity of a Co-225 polycrystalline sample, figure of merit (<jats:italic>Z<\/jats:italic>\n                  <jats:italic>T<\/jats:italic>) of the Co-225 whiskers is estimated 1.2\u20132.7 at <jats:italic>T<\/jats:italic>\u2265873 K. This compound is characterized with regard to low mobility and high density of carriers, which contradicts the conventional materials with high thermoelectric properties. \n  <\/jats:p>","DOI":"10.1143\/jjap.39.l1127","type":"journal-article","created":{"date-parts":[[2002,10,1]],"date-time":"2002-10-01T20:30:09Z","timestamp":1033504209000},"page":"L1127","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":511,"title":["An Oxide Single Crystal with High Thermoelectric Performance in Air"],"prefix":"10.35848","volume":"39","author":[{"given":"Ryoji","family":"Funahashi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ichiro","family":"Matsubara","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroshi","family":"Ikuta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tsunehiro","family":"Takeuchi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Uichiro","family":"Mizutani","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satoshi","family":"Sodeoka","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","reference":[{"key":"","doi-asserted-by":"publisher","first-page":"1164","DOI":"10.1103\/PhysRev.108.1164","volume":"108","year":"1957","journal-title":"Phys. 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