Premium
Thermoelectric Power in Nonstoichiometric Orthorhombic Titanium Oxides
Author(s) -
Tsuyumoto Isao,
Hosono Taisuke,
Murata Masataka
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.00979.x
Subject(s) - orthorhombic crystal system , thermoelectric effect , materials science , seebeck coefficient , titanium , anatase , thermoelectric materials , oxide , thermoelectric generator , figure of merit , condensed matter physics , mineralogy , thermodynamics , metallurgy , crystallography , photocatalysis , chemistry , optoelectronics , crystal structure , physics , biochemistry , catalysis
Nonstoichiometric orthorhombic titanium oxides (TiO x ; x =1.86–1.94) prepared by reducing the anatase titanium oxide in H 2 at 950°C are found to show large thermoelectric power. Their Seebeck coefficients are in the range −0.060 to −0.518 mV/K, and theoretical discussions are made based on the assumption that the electronic spin entropy dominating the entropy current is a main factor of the thermoelectric power. The figure of merit for TiO 1.94 at 70°C is estimated at 0.195. The nonstoichiometric orthorhombic titanium oxides, containing no hazardous elements, are promising materials for thermoelectric power generation.