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Wolf, G.; Königsberger, Erich; Schmidt, Horst; Königsberger, Lan-Chi; Gamsjäger, Heinz

doi:10.1023/a:1010114131577

Cited by 66 publications

(46 citation statements)

References 21 publications

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“…Indeed, in numerous studies [8][9][10], an exothermic peak has been obtained and not two as in our case in the same domain of temperatures when vaterite is calcined under a flow of air. This single peak has been attributed to the transformation of the calcium carbonate structure from the vaterite phase into the calcite phase.…”

Section: Resultssupporting

confidence: 54%

“…The first possesses a rhombohedral structure whereas the second is an orthorhombic structure. It is well-known that vaterite transforms into calcite either by simple contact with water at room temperature [1][2][3][4][5][6][7] or by heating under air [8][9][10]. The introduction in the vaterite metal ions can stabilize or delay its transformation into calcite.…”

Section: Introductionmentioning

confidence: 99%

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Nassrallah-Aboukaïs

Jacquemin

Decarne

et al. 2003

Journal of Thermal Analysis and Calorimetry

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The transformation of vaterite into calcite may be performed by heating in the presence and the absence of oxygen. Vaterite remains thermally stable until a calcination temperature of 450°C. It transforms progressively to calcite up to 500°C giving two exothermic peaks: 1) at 481°C due to the transformation of vaterite surface which is in contact with a small amount of calcite phase already formed with the time on the solid surface from the humidity atmosphere; 2) at 491°C due to the transformation of pure vaterite bulk. The calcite phase remains stable until 700°C. Above this temperature the formation of CaO is observed.

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Section: Resultssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Untitled

Nassrallah-Aboukaïs

Jacquemin

Decarne

et al. 2003

Journal of Thermal Analysis and Calorimetry

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“…It was reported by Wolf et al [17] that the Gibbs energy of transition from vaterite to calcite is about À3 kJ mol À1 when the solvent is pure water. Similarly, the thermally induced aragonite to calcite phase transition enthalpy is only 0.4 kJ mol À1 .…”

Section: Resultsmentioning

confidence: 98%

Polymorph Switching of Calcium Carbonate Crystals by Polymer‐Controlled Crystallization

Dong

Antonietti

et al. 2008

Adv Funct Materials

146

120

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Polymer‐controlled crystallization of calcium carbonate crystals in solution by a gas diffusion method has been carried out in the presence of poly(sodium 4‐styrene sulfonate‐co‐N‐isopropylacrylamide) (PSS‐co‐PNIPAAM), and for the first time all three anhydrous polymorphs, calcite, vaterite, and aragonite could be selectively produced with a single additive. The selective polymorph synthesis can be nicely adjusted simply by concentration variations of polymer and calcium ions in the present reaction system. The simplicity of the system reveals the influence of Ca2+ and polymer concentration on the nucleation and crystal growth of CaCO3 via the balance between thermodynamic and kinetic reaction control. A single mechanistic framework employing particle mediated as well as ion mediated crystallization for polymorph control is proposed.

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“…Equation (106) Similar reasoning was applied to the measurements of Wolf et al 110 on the vaterite-calcite transition. Based on their c p data of vaterite and calcite, and enthalpies of transition at 313 K and at 630-770 K, the following equation for the heat capacity of transition is estimated:…”

Section: Independent Thermodynamic Datamentioning

confidence: 97%

IUPAC-NIST Solubility Data Series. 95. Alkaline Earth Carbonates in Aqueous Systems. Part 1. Introduction, Be and Mg

Visscher

Vanderdeelen

Königsberger

et al. 2012

Journal of Physical and Chemical Reference Data

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The alkaline earth carbonates are an important class of minerals. This volume compiles and critically evaluates solubility data of the alkaline earth carbonates in water and in simple aqueous electrolyte solutions. Part 1, the present paper, outlines the procedure adopted in this volume in detail, and presents the beryllium and magnesium carbonates. For the minerals magnesite (MgCO 3 ), nesquehonite (MgCO 3 Á3H 2 O), and lansfordite (MgCO 3 Á5H 2 O), a critical evaluation is presented based on curve fits to empirical and=or thermodynamic models. Useful side products of the compilation and evaluation of the data outlined in the introduction are new relationships for the Henry constant of CO 2 with Sechenov parameters, and for various equilibria in the aqueous phase including the dissociation constants of CO 2 (aq) and the stability constant of the ion pair MCO 0 3 ðaqÞ (M ¼ alkaline earth metal). Thermodynamic data of the alkaline earth carbonates consistent with two thermodynamic model variants are proposed. The model variant that describes the Mg 2þ ÀHCO À 3 ion interaction with Pitzer parameters was more consistent with the solubility data and with other thermodynamic data than the model variant that described the interaction with a stability constant.

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Cited by 66 publications

References 21 publications

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Polymorph Switching of Calcium Carbonate Crystals by Polymer‐Controlled Crystallization

IUPAC-NIST Solubility Data Series. 95. Alkaline Earth Carbonates in Aqueous Systems. Part 1. Introduction, Be and Mg

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