Broad distribution of crystal-field environments for Nd3+ in calcite

    Authors

    S. H. Withers; R. E. Peale; A. F. Schulte; G. Braunstein; K. M. Beck; W. P. Hess;R. J. Reeder

    Comments

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    Abbreviated Journal Title

    Phys. Chem. Miner.

    Keywords

    calcium carbonate; calcite; neodymium; carbonate minerals; nuclear waste; STRONTIUM FLUOROVANADATE; SPECTROSCOPY; LUMINESCENCE; 25-DEGREES-C; COORDINATION; ELEMENTS; SORPTION; XAFS; Materials Science, Multidisciplinary; Mineralogy

    Abstract

    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.

    Journal Title

    Physics and Chemistry of Minerals

    Volume

    30

    Issue/Number

    7

    Publication Date

    1-1-2003

    Document Type

    Article

    Language

    English

    First Page

    440

    Last Page

    448

    WOS Identifier

    WOS:000185484900007

    ISSN

    0342-1791

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