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crystal data
The compounds, M(SeO4)2.4H2O, where M = Zr4+ and Ce4+, are orthorhombic with space group Fddd. a = 26.44 ± 0.03, b = 11.92 ± 0.01, c = 5.632 ± 0.006 Å for the zirconium compound and a = 27.31 ± 0.02, b = 12.38 ± 0.01, c = 5.736 ± 0.006 Å for the cerium compound. X-ray powder diffraction data are reported.