Stoichiometry unit analysis method

X-ray powder diffraction data for the compounds Sr3Sc(B03)3 and SreYj 07AIq,93(803)6 are given in Table I. Rhombohedral unit-cell parameters for each compound prepared by the two different synthetic methods are listed in Table II. Cell parameters were determined by least-squares analysis of 10 reflections collected by using an automated Philips powder diffractometer and corrected with NIST Si standard 640b. The nonstoichiometry of the Y-Al phase has been verified by single-crystal X-ray analysis. Powder diffraction measurements indicate that it is a line phase at this stoichiometry. 

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