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Open AccessArticle

Synthesis and Characterization of (Ca,Sr)[C2O4]∙nH2O Solid Solutions: Variations of Phase Composition, Crystal Morphologies and in Ionic Substitutions

Crystallography Dept., Institute of Earth Sciences, St. Petersburg State University, 7/9, University emb., 199034 St. Petersburg, Russia
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Crystals 2019, 9(12), 654; https://doi.org/10.3390/cryst9120654
Received: 14 November 2019 / Revised: 4 December 2019 / Accepted: 6 December 2019 / Published: 8 December 2019
(This article belongs to the Special Issue Mineralogical Crystallography)
To study strontium (Sr) incorporation into calcium oxalates (weddellite and whewellite), calcium-strontium oxalate solid solutions (Ca,Sr)[C2O4]∙nH2O (n = 1, 2) are synthesized and studied by a complex of methods: powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. Two series of solid solutions, isomorphous (Ca,Sr)[C2O4]·(2.5 − x)H2O) (space group I4/m) and isodimorphous Ca[C2O4]·H2O(sp.gr. P21/c)–Sr[C2O4]·H2O(sp.gr. P 1 - ), are experimentally detected. The morphogenetic regularities of their crystallization are revealed. The factors controlling this process are discussed. View Full-Text
Keywords: calcium oxalate; strontium oxalate; solid solutions; ionic substitutions; weddellite; whewellite; X-ray powder diffraction; scanning electron microscopy; EDX spectroscopy calcium oxalate; strontium oxalate; solid solutions; ionic substitutions; weddellite; whewellite; X-ray powder diffraction; scanning electron microscopy; EDX spectroscopy
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Rusakov, A.V.; Kuzmina, M.A.; Izatulina, A.R.; Frank-Kamenetskaya, O.V. Synthesis and Characterization of (Ca,Sr)[C2O4]∙nH2O Solid Solutions: Variations of Phase Composition, Crystal Morphologies and in Ionic Substitutions. Crystals 2019, 9, 654.

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