In Vitro Synthesis of High Mg Calcite under Ambient Conditions …
网页2011年5月5日 · The magnesium contents in Mg-bearing calcite can be exquisitely tuned from 15 to 40 mol % by changing the Mg/Ca ratio in mother solutions. We found appropriate polymer concentration windows for the synthesis of pure phase high Mg-calcite under defined crystallization conditions.
Biogenic and synthetic high magnesium calcite – A review
网页2014年1月1日 · Besides investigating the microstructures of biogenic high-Mg calcite minerals, many efforts have been devoted to synthesizing Mg-containing calcite crystals with high magnesium contents under ambient conditions through bioinspired strategies, which may also shed light on the formation mechanism of biogenic high-Mg calcites.
High‐Magnesium Calcite Mesocrystals: Formation in Aqueous Solution ...
网页2017年11月2日 · Under ambient conditions, it remains challenging to prepare mesocrystals of high-magnesian calcite in aqueous solution. We report that mesocrystals of calcite with magnesium content of about 20 mol % can be obtained from the phase transformation of magnesian amorphous calcium carbonate (Mg-ACC) in lipid solution.
Biogenic and synthetic high magnesium calcite – A review
网页2014年1月1日 · Systematic investigations on the Mg distribution, the crystal orientation, the formation mechanism and the mechanical properties of biogenic high-Mg calcites in different marine organisms were summarized in this review. Particular attention is paid to the thermodynamically unstable high-Mg calcite minerals with Mg contents higher than 4 mol ...
From spinodal decomposition to alternating layered structure …
网页2019年10月8日 · We propose that formation proceeds via a spinodal decomposition of a liquid or gel-like magnesium amorphous calcium carbonate (Mg-ACC) precursor into Mg-rich nanoparticles and a Mg-depleted...
Calcium isotopic fractionation during aragonite and high-Mg calcite ...
网页2023年11月15日 · Solute concentration and Ca isotopic ratios in pore water profiles reflect the ongoing process of carbonate precipitation, allowing for the tracing of the associated mineral phases, precipitation rates, and Ca isotopic fractionation factors. High-Mg calcite exhibits higher Mg/Ca and lower Sr/Ca ratios compared to aragonite.
Low-Temperature Synthesis of Disordered Dolomite and High …
网页2021年12月17日 · Disordered dolomite and high Mg-calcite can directly precipitate through homogeneous nucleation at room temperature by lowering the dielectric constant of the solution, with a linear relationship between a decreasing solution dielectric constant and increasing Mg incorporation.
High-Mg calcite nanoparticles within a low-Mg calcite matrix: A …
网页High-Mg calcite biominerals with a Mg content that exceeds the thermodynamic solubility limit are secreted by a wide variety of organisms belonging to different kingdoms and phyla.
Synchrotron high-resolution XRD and thermal expansion of synthetic Mg ...
网页2020年10月20日 · High-Mg calcite (up to 41 mol% MgCO3) displays domains with different local ordering configurations and similar or slightly different Mg contents, and to which is added a compositional variation between crystals, as determined by EMP, of the order of ± 0.8 mol% MgCO3.
网页presence of high-Mg nanoparticles embedded within lower-Mg calcite matrices is a widespread strategy utilized by various organisms from different kingdoms and phyla to improve the mechanical properties of their high-Mg calcite skeletons. We show that such phase separation and the formation of high-Mg nanoparticles are most probably