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The diffusion coefficients of deuterium in single crystals of LiTaO& have been measured by rnonitoring the growth of OD infrared-absorption bands in samples heated in Aowing D20 vapor. At 950 K, the diffusion coe%cient is 1.7X 10 cm /s for diffusion along the crystallographic c axis, and the activation energy is 1.5 eV. Electric-field-enhanced diffusion of deuterium was also demonstrated. Proton replacement and electron-nuclear double resonance experiments have shown that the structure previously reported in the electron paramagnetic resonance spectrum of a radiationinduced center in LiTaO, is not due to a hyperfine interaction with protons.

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