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Examination of the solid phases in the system AgI–NaI–H 2 O

Examination of the solid phases in the system AgI–NaI–H 2 O By means of several low temperature devices the solid hydrous phases of the AgI–NaI–H2O system have been extensively studied by X‐ray diffraction, transmission Laue photography, and polarizing microscopy. The density, composition and unit‐cell parameters have been determined for three distinct AgI–NaI hydrates for which the stability regions correspond to phases C, E, and F previously reported by Davis (J. Atmos. Sci. (1969), 26, 1042). The cell assignments are based on determinations of axial ratios from the Laue photographs and interplanar spacing analyses utilizing the Hesse–Lipson technique, Cohen cell‐parameter refinement and the de Wolff cell‐reliability criteria. All phases are of the composition AgI–NaI–nH2O with phase C at 25 °C having n = 4, ρ = 3.0 g.cm−3 (measured and calculated) and indexing on the basis of a monoclinic cell with parameters a0 = 7.573, b0 = 9.454, c0 = 12.403 Å, and β = 92.43° with Z = 4. Phase F at −10 °C is also monoclinic with a0 = 5.757, b0 = 13.563 and c0 = 12.541 Å and β = 103.05° with Z = 4, and n = 4. Phase E appears to consist of two structures, very similar but differing in cell volume by 2.8%. We believe this to be due to varying water content, the n = 3 phase being metastable. The cell reliability factor is less than 10 for both cells and indexing is considered to be tentative. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Crystallography Wiley

Examination of the solid phases in the system AgI–NaI–H 2 O

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Publisher
Wiley
Copyright
Copyright © 1972 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1600-5767
eISSN
1600-5767
DOI
10.1107/S0021889872009197
Publisher site
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Abstract

By means of several low temperature devices the solid hydrous phases of the AgI–NaI–H2O system have been extensively studied by X‐ray diffraction, transmission Laue photography, and polarizing microscopy. The density, composition and unit‐cell parameters have been determined for three distinct AgI–NaI hydrates for which the stability regions correspond to phases C, E, and F previously reported by Davis (J. Atmos. Sci. (1969), 26, 1042). The cell assignments are based on determinations of axial ratios from the Laue photographs and interplanar spacing analyses utilizing the Hesse–Lipson technique, Cohen cell‐parameter refinement and the de Wolff cell‐reliability criteria. All phases are of the composition AgI–NaI–nH2O with phase C at 25 °C having n = 4, ρ = 3.0 g.cm−3 (measured and calculated) and indexing on the basis of a monoclinic cell with parameters a0 = 7.573, b0 = 9.454, c0 = 12.403 Å, and β = 92.43° with Z = 4. Phase F at −10 °C is also monoclinic with a0 = 5.757, b0 = 13.563 and c0 = 12.541 Å and β = 103.05° with Z = 4, and n = 4. Phase E appears to consist of two structures, very similar but differing in cell volume by 2.8%. We believe this to be due to varying water content, the n = 3 phase being metastable. The cell reliability factor is less than 10 for both cells and indexing is considered to be tentative.

Journal

Journal of Applied Crystallography – Wiley

Published: Jun 1, 1972

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