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Defects and Transport Properties in TiNb 2 O 7
Author(s) -
Xing Wen,
Kalland LivElisif,
Li Zuoan,
Haugsrud Reidar
Publication year - 2013
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/jace.12558
Subject(s) - conductivity , electrical resistivity and conductivity , chemistry , partial pressure , oxygen , thermal conduction , materials science , physics , organic chemistry , composite material , quantum mechanics
The electrical conductivity of TiNb 2 O 7 was characterized as a function of temperature,pO 2andpH 2 O. The total conductivity was independent ofpO 2in the low oxygen partial pressure regime, while a dependency ofpO 2− 1 / 4was observed at higher oxygen partial pressures. The conductivity increased with increasingpH 2 Ounder oxidizing conditions below 700°C. Mixed electronic and protonic conduction was indicated by H/D isotope exchange and transport number measurements. A defect model based on interstitial type of hydration was established and fitted to the conductivity data allowing for determination of physicochemical parameters of hydration and electron migration.