· The effect of NH + 4 concentration on the formation process of vaterite under three special systems containing NH + 4 was investigated via direct carbonation of waste carbide slag. The synergistic effects of NH + 4 with organic (CH 3 COO-) and inorganic (S 2 O 2–8) systems on vaterite formation were systematically studied.
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Vaterite-CaCO3 is the least thermodynamically stable form of CaCO 3. Under normal geological conditions, vaterite will transform into calcite ( Addadi et al., 2003; De Leeuw & Parker, 1998; Nancollas & Sawada, 1982 ). Organic additives inhibit vaterite crystal growth rate and prevent its transformation to calcite ( Katsifaras & Spanos, 1999
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THE NATURE OF THE VATERITE CRYSTAL STRUCTURE. The basic nature of the vaterite crystal structure has been known for nearly a century, although there remains controversy about the details. The mineral has a hexagonal substructure with a 4.1 Å and c 8.5 Å,16,17and is optically positive with. ≈ ≈.
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General Vaterite Information Chemical Formula: CaCO3 Composition: Molecular Weight = 100.09 gm Calcium 40.04 % Ca 56.03 % CaO Carbon 12.00 % C 43.97 % CO 2 Oxygen 47.96 % O 100.00 % 100.00 % = TOTAL OXIDE Empirical
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Vaterite Wang J, Becker U (2009) Structure and carbonate orientation of vaterite (CaCO3) American Mineralogist 94 380-386 2009 theoretical 0 293 0009279 Vaterite Kamhi S R (1963) On the structure of vaterite, CaCO3 Acta Crystallographica 16 770-772 1963 0
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· The importance of the metastable vaterite form of CaCO3 is increasingly appreciated as an intermediate between amorphous calcium carbonate and more stable crystalline polymorphs in biogenic calcification pathways. Thus, there is a need to be able to identify nanocrystals of vaterite unambiguously, despite uncertainties about its exact
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· vaterite, some misinterpretation of data, and some claims that cannot be correct. This critical. review of the literature aims to resolve the issue. The orientationally disordered (2 H) structure
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· The widespread application of calcium carbonate is determined by its high availability in nature and simplicity of synthesis in laboratory conditions. Moreover, calcium carbonate possesses highly attractive physicochemical properties that make it suitable for a wide range of biomedical applications. This review provides a conclusive analysis of the
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· Vaterite is a mineral, a polymorph of calcium carbonate (CaCO 3 ). Vaterite is usually colorless, having spherical shape and porous inner structure. The diameter of a vaterite particle ranges from
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Therefore, preparing calcite and vaterite from solid waste carbide residue (CS) by wet carbonation and examining influence of these two CC polymorphs (0–20 %) on cement
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Vaterite is a mineral, a polymorph of calcium carbonate (CaCO3). It was named after the German mineralogist Heinrich Vater. It is also known as mu-calcium carbonate (μ-CaCO3). Vaterite belongs to the hexagonal crystal system, whereas calcite is trigonal and aragonite is orthorhombic. Vaterite, like aragonite, is a metastable phase of calcium
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· Vaterite commonly precipitates in a spherical shape when grown in the laboratory from supersaturated solutions (e.g., Turnbull 1973, Kolodny and Gross 1974, Vecht and Ireland 2000 and has also been reported to be in the form of spheres where it was formed in drilling muds from petroleum wells Friedman et al 1993, Friedman and
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: Peiyuan Chen, Jialai Wang, Liang Wang, Ying Xu, Xin Qian, Honghao MaDiagrammatic representations of highest-symmetry carbo-nate ordering patterns in a single layer of vaterite structure. Columns ∥ z of Ca atoms at z = 0 and 1/2 are shown by
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· It is possible that these ions may co-precipitate with the vaterite or be adhered to the surface of vaterite, influencing the nucleation or growth of the vaterite particles. When 10% ethanol was added into the waste solution, more vaterite particles were produced as shown in Fig. 5 (b).
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Roberto dos Reis 3, Vinayak P. Dravid 3 & Xiaobing Hu 3. Checkforupdates. Calcium carbonate (CaCO3), the most abundant biogenic mineral on earth, plays a crucial role in various fields such as
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