High Temperature Evaporation of Oxides from the LaB_6 (100) Surface Following Reaction with Water :

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Abstract

We have used the technique of temperature programmed desorption to study the desorption of La and B atoms from the clean LaB_6(100) surface and to study the desorption of oxides following the reaction of the surface with D_2O. We find that the rate at which the sample is cooled back to room temperature following annealing at 1900 K has a significant effect on the subsequent evaporation rate of La but not of B. The surface oxide formed upon D_2O exposure is removed through the desorption of BO and LaO between 1300 and 1500 K and the desorption of B_2O_2 between 1100 and 1500 K. The results are similar to what we have observed in the reaction of LaB_6(100) with O_2. In particular, oxidation with D_2O did not lead to the desorption of any deuterium containing species, such as DOBO, except for D_2. It was not possible, however, to determine if the D_2 desorption came from the tantalum sample holder or from the LaB_6 surface.

Journal

  • JJAP series

    JJAP series 10 174-177, 1994-06-30

    Japanese Journal of Applied Physics

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