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Surface Segregation of Niobium and Tantalum in Titanium Dioxide. Overview
Author(s) -
Atanacio Armand J.,
Ikuma Yasuro
Publication year - 2016
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.14122
Subject(s) - tantalum , niobium , materials science , oxygen , oxide , titanium dioxide , surface layer , surface energy , solid solution , chemical engineering , titanium , layer (electronics) , inorganic chemistry , metallurgy , nanotechnology , chemistry , composite material , organic chemistry , engineering
Segregation in crystals results in surface layer enrichment of selected lattice elements. The present work considers the phenomenon of segregation in solid solutions of TiO 2 doped with donor‐type elements, such as niobium and tantalum. The focus is on the effect of oxygen activity on segregation at elevated temperatures. It is shown that the effect of oxygen activity on the segregation‐induced enrichment may be used for engineering of oxide materials in general and TiO 2 ‐based materials in particular with controlled surface composition that is required to achieve the desired reactivity and photoreactivity for energy conversion in general and solar energy conversion in particular. The development of the related surface engineering procedures requires correct determination of oxygen activity during processing and the segregation‐induced concentration gradients within the surface layer.