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Microtwinning hypothesis for a more ordered vaterite model
An orthorhombic fully ordered structural model is proposed for vaterite space group Ama2, a =8.4721 5 A, b=7.1575 7 A, c=4.1265 4 A, Z=4, and V=250.23 4 A3 . It is based on a microtwinningExpand
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Synthesis of calcium carbonate polymorphs in the presence of polyacrylic acid
Calcium carbonate precipitates are prepared from a solution of CaCl2 and K2CO3 in the presence of polyacrilic acid. The effect of polyacrilic acid incorporation in the [25–801C] temperature range onExpand
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Voyaging around nacre with the X-ray shuttle: From bio-mineralisation to prosthetics via mollusc phylogeny
Strong textures of mollusc shell layers are utilised to provide phylogenetic information. Aragonitic and calcitic layers are the targets here, inside which nacre layers, but not only, play a specificExpand
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Microstructure and crystallographic texture of Charonia lampas lampas shell.
Charonia lampas lampas shell is studied using scanning electron microscopy and X-ray diffraction combined analysis of the preferred orientations and cell parameters. The Charonia shell is composed ofExpand
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Photo-oxidation process of indole in aqueous solution with ZnO Catalyst: Study and optimization
The photo-oxidation of indole has been investigated using the catalytically active ZnO in aqueous solution, under various physical and chemical conditions. First of all, a structural analysis with XExpand
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Microstructure analysis and mechanical properties by instrumented indentation of Charonia Lampas Lampas shell.
Scanning electron microscopy, X-ray diffraction and Fourier transformed infrared spectroscopy have been used to characterize the microstructure and instrumented microindentation for the determinationExpand
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The effect of ergocalciferol on the precipitation of calcium carbonate
Abstract We have conducted the first study on the effect of ergocalciferol (vitamin D2) on the polymorphism of calcium carbonate. CaCO3 particles are synthesised from aqueous solutions of sodiumExpand
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Effects of sol concentration on structural, morphological and optical waveguiding properties of sol-gel ZnO nanostructured thin films
Nanostructured ZnO thin films with different precursor concentrations (0.5–0.8 M) have been deposited on glass substrates by sol-gel dip coating technique. X-ray diffraction (XRD), scanning electronExpand
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Stacking sequence variations in vaterite resolved by precession electron diffraction tomography using a unified superspace model
As a metastable phase, vaterite is involved in the first step of crystallization of several carbonate-forming systems including the two stable polymorphs calcite and aragonite. Its completeExpand
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Influence of growth time and substrate type on the microstructure and luminescence properties of ZnO thin films deposited by RF sputtering
Abstract We report the preparation by the RF magnetron sputtering technique of ZnO thin films with deposition times of 50 and 100 min on glass, amorphous quartz, and silica-on-silicon (SiO2/Si)Expand
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