Transformation of aragonite to calcite through heating.
نویسندگان
چکیده
منابع مشابه
High-pressure deformation of calcite marble and its transformation to aragonite under non-hydrostatic conditions
:, ~ varied most significantly with temperature, ranging from limited slip and twinning at 400°C, limited recrystalliza,t ,tion at 500°C, widespread recrystallization at 600 and 7QOoC, to grain growth at 800-900°C. Variations in ! confining pressure from 0.3 to 2.0 GPa have no apparent effect on calcite deformation microstructures. : Aragonite grew in 10-6-10-7 S-l strain rate tests conducted f...
متن کاملPhase Transformation of Mg-Calcite to Aragonite in Active-forming Hot Spring Travertines
A travertine specimen collected from the western part of Yunnan Province of China was subjected to microstructural analysis by powder X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy and energy dispersive X-ray spectroscopy. A new formation mechanism was proposed whereby polycrystalline rhombohedral particles of magnesium-containing calcite under...
متن کاملFabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition
Calcium carbonate (CaCO3) occurs in two major polymorphs: rhombohedral calcite and orthorhombic aragonite, the latter is thermodynamically metastable. In this study, we first prepared aragonite needle-like particles by introducing CO2-containing gas into Ca(OH)2 aqueous slurry. Then, the resulted aragonite particles were heat treated at 500 ◦C for 1 h, in order to induce the aragonite–calcite p...
متن کاملSimulation of Structural Transformation in Aragonite CaCO3
The structural transformation in aragonite CaCO3 is simulated by molecular dynamics. The simulations are based on the potentials calculated from the Gordon-Kim modified electron gas formalism. We found two phase transitions in aragonite at high temperature.
متن کاملDirect observation of the transition from calcite to aragonite growth as induced by abalone shell proteins.
The mixture of EDTA-soluble proteins found in abalone nacre are known to cause the nucleation and growth of aragonite on calcite seed crystals in supersaturated solutions of calcium carbonate. Past atomic force microscope studies of the interaction of these proteins with calcite crystals did not observe this transition because no information about the crystal polymorph on the surface was obtain...
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ژورنال
عنوان ژورنال: GEOCHEMICAL JOURNAL
سال: 1985
ISSN: 0016-7002
DOI: 10.2343/geochemj.19.245