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The four isotypic title compounds were prepared from the elements by reactions in an arc-melting furnace and subsequent annealing in sealed silica tubes at 970 K. The structure of the cerium compound was solved from single crystal X-ray diffractometer data: Pmn2 1 , oP80, a=465.27(8) pm, b=5348.3(9) pm, c=740.5(1) pm, R1=0.0735, 5552 F 2 values, 243 variables, and BASF=0.48(2). The...
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