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Title: Hydrogen : a metastable donor in TiO₂ single crystals
Authors: Chen, WP
Wang, Y 
Chan, HLW 
Issue Date: 20-Mar-2008
Source: Applied physics letters, 20 Mar. 2008, v. 92, 112907, p. 1-3
Abstract: The properties of TiO₂ (110) single crystals are greatly changed after hydrogen is doped into them through electrochemical hydrogen charging, in which the crystals have been placed in 0.01M NaOH solution to deposit hydrogen on their electrodes through the electrolysis of water. The changes in properties, including great increases in leakage current, strong dielectric dispersions over 10²-10[sup 6] Hz, and a strong aging phenomenon suggest that hydrogen is a donor in TiO₂ while ionized hydrogen is not bound to an oxygen site by a strong O-H bond. This behavior of hydrogen, which can be characterized as a metastable donor, is different from the usual donor behavior of hydrogen in oxides and should be interesting for a better understanding of the behavior of hydrogen in oxides.
Keywords: Ageing
Electrochemical electrodes
Hydrogen bonds
Leakage currents
Metastable states
Titanium compounds
Publisher: American Institute of Physics
Journal: Applied physics letters 
ISSN: 0003-6951
EISSN: 1077-3118
Rights: © 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in W.P. Chen, Y. Wang, & H.L.W. Chan. Appl. Phys. Lett. 92, 112907 (2008) and may be found at
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