Developments in Palygorskite-Sepiolite Research by Arieh Singer, Emilio Galan

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By Arieh Singer, Emilio Galan

The purpose of this comprehenvise publication is to present the most important effects completed within the learn of the clay minerals palygorskite and sepiolite. Palygorskite and sepiolite have stumbled on to be beneficial in an important number of business and clinical purposes. accordingly, learn on those clays has been intensified over the last 20 years, and important advances of their characterization were made. The e-book includes contributions from individual scientists within the field.Comprehensive remedy of palygorskite and sepioliteCutting-edge developments in business minerals and applicationsWritten via exotic scientists within the box

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The limited selected area electron diffraction (SAED) data suggest that this is a single crystal. Chapter 1 Structures/Microtextures of Palygorskite-Sepiolite Group 25 and an intimate association of smectite with reacted palygorskite fibres, and these observations suggest a dissolution–reprecipitation process. Gu¨ven and Carney (1979) found in hydrothermal experiments that NaCl increased the rate of formation of stevensite at temperatures below 260  C, and from 260 to 316  C sepiolite transformed to stevensite independent of ionic strength of the solution.

Smith and Norem, 1986). 0. Although impurities may be an issue, Newman and Brown (1987) found that octahedral occupancy varied from R3 þ2. 5 þ R2 þ1. 25 for Mg-rich palygorskite. 66 per eight T sites. Serna et al. (1977), using infrared spectroscopy, and Heller-Kalai and Rozenson (1981), using infrared and Mo¨ssbauer spectroscopy, concluded that vacancies are ordered into M1 in palygorskite, and that Mg (and Fe) preferentially orders into M3. Chryssikos et al. (2009), also using infrared analysis, found that regions of the palygorskite structure were dioctahedral (with AlAlOH, AlFe3þOH, Fe3þFe3þOH interactions) and trioctahedral (MgMgOH) regions, with these interactions implying that Al and Fe3þ order into M2.

8 . 5 implies that the SiÀÀO bond lacks significant covalent character. 5 . Similar problems exist for the orthorhombic palygorskite model. 4. Substitutions in Palygorskite and Sepiolite Cation sites in the palygorskite–sepiolite group minerals are commonly defined from the centre of the octahedral strip, where there is often a special position such as a mirror plane, to the outer edge. For example, M1 is the central octahedral site on the special position, with M2 adjacent to M1, and M3 adjacent to M2 but further from the special position, etc.

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