Broad distribution of crystal-field environments for Nd3+ in calcite
Abbreviated Journal Title
Phys. Chem. Miner.
calcium carbonate; calcite; neodymium; carbonate minerals; nuclear waste; STRONTIUM FLUOROVANADATE; SPECTROSCOPY; LUMINESCENCE; 25-DEGREES-C; COORDINATION; ELEMENTS; SORPTION; XAFS; Materials Science, Multidisciplinary; Mineralogy
Calcite crystals were grown from solution with single-crystal dimensions up to 3 mm and doped up to similar to0.1 at% with Nd3+ ions. Phase purity was verified by powder X-ray diffraction. The concentration of Nd3+ was measured by energy-dispersive spectrometry and Rutherford backscattering spectrometry. Micro X-ray fluorescence mapping of the calcite grains indicates uniform Nd distribution in as-grown crystal grains. X-ray absorption fine structure suggests that Nd3+ is substituted for Ca2+ with local lattice distortion. Temperature-dependent near-infrared spectroscopy of Nd3+ impurities in calcite reveals large inhomogeneous linewidths and smooth line profiles that are characteristic of glassy hosts, though the samples are well crystallized.
Physics and Chemistry of Minerals
"Broad distribution of crystal-field environments for Nd3+ in calcite" (2003). Faculty Bibliography 2000s. 4133.