Synthesis, XRD and FTIR studies of strontium richterites

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doi: 10.1127/ejm/2/2/0171
Authors:Della-Ventura, G.; Robert, J. L.
Author Affiliations:Primary:
Univ. "La Sapienza" Roma, Dipt. Geol. Terra, Sez. Mineral.-Cristallogr., I-00185 Rome, Italy
Volume Title:European Journal of Mineralogy
Source:European Journal of Mineralogy, 2(2), p.171-175. Publisher: Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller), Stuttgart, Federal Republic of Germany. ISSN: 0935-1221
Publication Date:1990
Note:In English. 18 refs.; 1 table
Summary:An IR study of hydrothermally prepared Sr-substituted Na and K richterites rules out the presence of Sr2+ in the A site, and this ion is allotted to the M4 site. XRD powder data show an increase in the a, b and beta cell parameters due to the larger ionic radius of eight-coordinated Sr2+ compared to Ca2+. The Na-Sr-richterite has a major IR band split into two components, at 3730 and 3725 cm-1; the K-Sr-richterite end- member has a single sharp band at 3735 cm-1 in the region of OH-stretching wavenumbers. These observations are discussed in terms of local polyhedral geometry. [R.A.H.]
Subjects:Alkaline earth metals; Amphibole group; Cell dimensions; Chain silicates; Clinoamphibole; Geochemistry; Infrared spectra; Metals; Order-disorder; Richterite; Silicates; Spectra; Strontium; Synthesis; X-ray data
Abstract Numbers:90M/4159
Record ID:1993015451
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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