Abstract
The 4.2 K optical absorption spectra of Ia-(NdO)2CO3 and II-(NdO)2CO3 are reported. Type Ia exhibits, apparently, a single site for neodymium, and type II, at least two sites. Electron-diffraction patterns obtained from flakes suggest a large orthorhombic unit cell for type Ia and confirm the hexagonal symmetry of the unit cell of type II.
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