Electrical transport properties of Mn- and Ni-doped barium titanate at high temperature

Autor:	Mario Maglione, B. Jannot, E. Duverger, M. Jannin
Rok vydání:	1994
Předmět:	Band gap Doping Analytical chemistry Mineralogy General Chemistry Partial pressure Conductivity Atmospheric temperature range Condensed Matter Physics Ferroelectricity chemistry.chemical_compound chemistry Electrical resistivity and conductivity Barium titanate General Materials Science
Zdroj:	Solid State Ionics. 73:139-145
ISSN:	0167-2738
DOI:	10.1016/0167-2738(94)90273-9
Popis:	The dependence on temperature and oxygen pressure of the electrical transport properties of the ferroelectric compound BaTiO3 doped with manganese or nickel is investigated in the temperature range 800–1100°C with an oxygen partial pressure continuously varying between 0.21 and 10−15 atmosphere. A complex impedance analysis method has been improved for the measurements. A point defect model is proposed to discuss the different behaviour of the two dopants. The calculated conductivity is in very good agreement with the experimental data over the full temperature and oxygen partial pressure ranges. The band gap derived from this work (2.96 eV) is in good agreement with the already reported values. The ionisation energy levels of these two impurities in the band gap have been determined and compared with the vlues deduced from the MS-LSD calculations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a6cf35695032165de3f3b59129d32468 https://doi.org/10.1016/0167-2738(94)90273-9 Zobrazit plný text záznamu