Abstract

The structure of cheralite, a thorium, calcium, rare earth monazite, has been completely redetermined. Patterson sections and three-dimensional difference maps were used to determine the atomic positions, and least squares refinement of the data reduced the R-factor to 0.084.

This structure is in accord with three of four previous monazite structure analyses, and the crocoite structure analysis. A relationship is apparent between increase of long Ce—O bonds and decrease of short Ce—O bonds and P—O bonds.

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