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Effect of High‐Temperature Treatment on n – p Transition in Titania
Author(s) -
Radecka Marta,
Rekas Mieczyslaw
Publication year - 2002
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.1151-2916.2002.tb00095.x
Subject(s) - seebeck coefficient , crystallite , materials science , electrical resistivity and conductivity , rutile , atmospheric temperature range , thermoelectric effect , analytical chemistry (journal) , grain size , mineralogy , condensed matter physics , thermodynamics , metallurgy , chemistry , composite material , thermal conductivity , physics , organic chemistry , chromatography , electrical engineering , engineering
This paper reports the electrical conductivity and Seebeck coefficient (thermopower) values derived for TiO 2 (rutile) at a temperature range of 923–1353 K and p O2 of 5 Pa–100 kPa. The effect of high‐temperature treatment on the electrical properties of polycrystalline samples is discussed in terms of defect models. Samples sintered at ≥1573 K, as well as the single crystals, show n ‐ to p ‐type transition, whereas samples sintered at 1473 K remain n ‐type throughout testing. No effect of grain size on thermopower is observed. These results are consistent with the defect disorder model assuming that titanium vacancies formed during high‐temperature treatment (1473–1673 K) are frozen at the measuring temperature (923–1323 K).