Mn-doped BaTiO3: Electrical Transport Properties in Equilibrium State

• Published in: Journal of electroceramics 1997-01, Vol.1 (1), p.27
• Main Authors: Song, Chang-rock, Yoo, Han-ill, Kim, Jae-young
• Format: Article
• Language: English
• ISSN: 1385-3449; 1573-8663
• DOI: 10.1023/A:1009994230779

The electrical conductivity and thermoelectric power of Mn-doped BaTiO^sub 3^ (1 mole%) and "undoped" BaTiO^sub 3^ have been measured as functions of oxygen partial pressure (in the range of 10^sup -16^ to 1 atm) and temperatures (in the range of 900 to 1200°C), and compared with each other to differentiate the effect of the Mn-addition. It is found that the isothermal conductivity of Mn-doped BaTiO^sub 3^ varies with increasing Po^sub 2^ as σ (ProQuest: Formulae and/or non-USASCII text omitted; see image) to (ProQuest: Formulae and/or non-USASCII text omitted; see image) to (ProQuest: Formulae and/or non-USASCII text omitted; see image) , unlike previously reported. This behavior is well explained by the shift of the ionization equilibrium, (ProQuest: Formulae and/or non-USASCII text omitted; see image) . The corresponding equilibrium constant, K^sub A^, is determined from the Po^sub 2^ values demarcating those three different Po^sub 2^ regions as (ProQuest: Formulae and/or non-USASCII text omitted; see image) =3.19×10^sup 22^ exp(-1.69 eV/kT). Basic parameters involving carrier density and mobility, and defect structure of Mn-doped BaTiO^sub 3^ are discussed in comparison with those of undoped BaTiO^sub 3^.[PUBLICATION ABSTRACT]