Table 1.

Unit-cell parameters and FWHM of (002) Bragg peak of La-, Ce-, Pr- and Nd-bearing lanthanite end products. Shown in column one (in brackets) are the ionic radii and the ionic potentials of each REE3+ ion.

Ion (ionic radii; ionic potential)a (Å)b (Å)c (Å)Volume (Å3)FWHM (002) Bragg peak of REE-Lanthanites (°)
La (1.15 Å; 2.60 Å−1)8.989 ± 0.0019.573 ± 0.00117.027 ± 0.0011465.0 ± 25.00.085
Ce (1.11 Å; 2.70 Å−1)8.944 ± 0.0019.533 ± 0.00116.963 ± 0.0021446.4 ± 10.00.119
Pr (1.09 Å; 2.75 Å−1)8.901 ± 0.0029.474 ± 0.00216.930 ± 0.0041427.8 ± 17.30.570
Nd (1.08 Å; 2.77 Å−1)8.889 ± 0.0029.430 ± 0.00216.900 ± 0.0021416.0 ± 40.02.014