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Electron microscopic examination of the Af sample showed it to be composed of nearly isotropic particles about 0.3M in diameter.

The particles appeared rough and undoubtedly the single-crystal domains are smaller than this.

The x-ray data are consistent with particle sizes of 1000 A or greater.

We found no obvious effects due to preferred orientation of the crystallites in this sample nor would we expect to on the basis of the shape found from electron microscopic examination.