Title

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

Authors

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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