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NotesVol. 67 for many of the compounds in this study, it could not be positively concluded that compounds containing iron, cadmium, or lead as the B' ion, which could not be heated above the 1000-1100°t emperature range, were not ordered even though no ordering lines were visible in their ;X-ray patterns. However, for the purpose of this study compounds Containing cadmium, lead, or iron were indexed on the basis of an ~4 A. cubic perovskite unit cell with the exception of Sr(í'eo.8sNbo.j7)Os which was indexed on a small tetragonal unit cell All other compounds, except Ba(Zno.33Nb0.67)03 and BafXio.asNbo^Oe, gave X-ray patterns similar to that of the ordered perovskite BaCSro.ssTao.eviOs and, therefore, were indexed on the basis of hexagonal unit cells.1 234

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