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Cation ordering and structural deformations in pectolite HNaCaSi3O9 - serandite HNaMn2Si3O9

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Abstract

Using the X-ray diffraction analysis, the structures of the pectolite-serandite series with the general formula HNaCa2−x Mn x Si3O9, are studied where 0 < x < 2, with x = 0.02, 0.14, 0.39, and 1.17. The Mn2+ cations mostly occupy the M2 site (0.02, 0.14, 0.34, and 0.90 apfu). Here 〈M1-O〉 = 2.367–2.369 Å decreases down to 2.355 Å; 〈M2-O〉 decreases from 2.355 Å to 2.239 Å. The lengths O3–O4 = 2.47–2.49 Å, bond lengths H-O3 = 1.07–1.24 Å and H-O4 = 1.44–1.32 Å. For 〈M1-O〉 and 〈M2-O〉 of about (Mn2+ + Fe2+) ≈ 1 a turning point is noted in the graph. The a, b, c, and β parameters decrease linearly.

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Authors and Affiliations

  1. St. Petersburg State University, St. Petersburg, Russia

    I. V. Rozhdestvenskaya

  2. Karpinskii All-Russian Research Geological Institute, St. Petersburg, Russia

    V. A. Vasilieva

Authors
  1. I. V. Rozhdestvenskaya
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  2. V. A. Vasilieva
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Correspondence to I. V. Rozhdestvenskaya.

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Original Russian Text © 2014 I. V. Rozhdestvenskaya, V. A. Vasilieva.

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Translated from Zhurnal Strukturnoi Khimii, Vol. 55, Supplement 1, pp. S85–S93, 2014.

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Rozhdestvenskaya, I.V., Vasilieva, V.A. Cation ordering and structural deformations in pectolite HNaCaSi3O9 - serandite HNaMn2Si3O9 . J Struct Chem 55, 1268–1276 (2014). https://doi.org/10.1134/S0022476614070105

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  • DOI: https://doi.org/10.1134/S0022476614070105

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