Abstract
Hydrogen in rutile has two influences on the electrical properties:
Verneuil crystals contain hydrogen compensating the trivalent impurities.
Excess hydrogen acts as an electron donor, thereby increasing the
conductivity.
Removal of hydrogen above 650°C in vacuum causes structural changes
accompanied by enhanced conductivity and dielectric loss. There is also a
change in the activation energy for diffusion at this temperature. Values of
the coefficient of diffusion of protons in the temperature range 450-800°C
in crystals of differing impurity content are presented.
The position of the hydrogen, in the basal plane of the rutile lattice, is confirmed
by the dichroism of the absorption. Weight-loss experiments suggest that hydrogen
leaves the crystal in combination with oxygen in the proportions required to form
water.
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials
Cited by
27 articles.
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