The Diffusion of Barium in a Rutile Single Crystal

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1) Microscopic and radiotracer studies have been made upon the diffusion of barium into a rutile single crystal. 2) In the microscopic observation, the diffusion layer of barium oxide in the rutile single crystal was confirmed to liquefy above 1300°C due to the formation of a eutectic mixture between both constituents. Below 1300°C solid phase diffusion prevails, and the diffusion layer consists of polycrystalline of a random orientation. 3) The diffusion coefficients of barium oxide in a rutile single crystal were measured by means of the radiotracer method using 133Ba. The diffusion coefficients obtained were 3.5×10－14∼2.4×10－13cm2/sec. in the range of 1100∼1200°C and 1.1×10－12 cm2/sec. at 1300°C. Between 1100°C and 1200°C, small differences seemed to be observed for the values obtained according to the direction of the diffusion in the crystal, but this is not conclusive. The large value of the diffusion coefficient at 1300°C was considered to be due to the liquefaction of the diffusion layer. The energy of activation was calculated to be 43 kcal./mol. (parallel to the c-axis) and 59 kcal./mol. (perpendicular to the c-axis).
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