Sc) has been synthesized. The structure of the Sc derivative has been determined by singlecrystal X-ray methods. It crystallizes in s ace group P63cm with six formula units in a cell of dimensions a = 9.227(2), c = 17.135(3) 1, and V = 1227.2(5) A3. The structure contains layers of triangular planar BO3 groups that are interleaved by 9-coordinate Ba atoms and 6-coordinate Sc atoms. Analysis of powder X-ray diffraction data indicates that the analogues containing the M atoms listed above are isostructural to the Sc derivative. Analysis of photoluminescence and powder X-ray data for the solid solution Ba3Y1-*.EuX(B03)3 reveals the maximum size of the M atom that can be incorporated into the structure. Thermal and melting characteristics for each of the M derivatives are also described.
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