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crystal data
Unit-cell constants for an isotypic series of hexagonal (P63/m) M(OH)3 where M = La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Y, Am and Cm are reported. Equations to determine the M-O distances were deduced. These calculated bond lengths are compared with experimental values. An independent set of ionic crystal radii for the metal ions was deduced and compared with reliable literature values.