Crystallographic orientation of orthorhombic aragonite using reflection generalized ellipsometry

Jellison, Jr., Gerald Earle; Leonard, Donovan N.; Anovitz, Lawrence M.; Cheshire, Michael C.; Specht, Eliot D.; Rosseel, T. M.

doi:10.1063/1.5109093

Title: Crystallographic orientation of orthorhombic aragonite using reflection generalized ellipsometry

Journal Article · 23 July 2019 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.5109093 · OSTI ID:1808421

Jellison, Jr., Gerald Earle ^[1];

^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, the 2-modulator generalized ellipsometry microscope (2-MGEM) has been used to study a natural crystal of aragonite. Like its polymorph calcite, aragonite has a large refractive index difference between light polarized parallel to the c-axis and light polarized perpendicular to the c-axis. Unlike calcite, aragonite is orthorhombic, so there is also a very small difference between the refractive indices polarized along the a- and b-directions. As a result, it is not possible to use the 2-MGEM to obtain a definitive map of the optic axis directions of a sample as was possible with calcite, but it is possible to determine approximately the orientation of the c-axis with respect to the surface normal. If the c-axis is in the sample surface plane, it is possible to measure very small deviations of the c-axis direction with an accuracy of ~0.2°. If the c-axis is oriented normal to the sample surface, 2-MGEM data can be used to identify different crystallites due to rotations about the c-axis. For comparison, the orientations of some of the crystallites have also been measured using X-ray Laue and electron beam backscatter diffraction. In addition, spectroscopic generalized ellipsometry measurements have been used to determine the refractive indices of aragonite.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1808421

Journal Information:: Journal of Applied Physics, Vol. 126, Issue 4; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Crystallographic orientation of orthorhombic aragonite using reflection generalized ellipsometry

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