Divalent cation diffusion in calcium fluorapatite

Jay, Eleanor E.; Mallinson, Phillip M.; Fong, Shirley K.; Metcalfe, Brian L.; Grimes, Robin W.

doi:10.1007/s10853-011-5712-4

Cited by 8 publications

(7 citation statements)

References 23 publications

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“…This supports previous studies which suggested that the species at 577.7 nm is an intermediate species [24]. This is more acceptable as a crystallization process through grain growth than an intermediate found in a diffusion process from the Ca(I) site to the Ca(II) site in apatite, because there would be no site readily available within the diffusion process [34].…”

Section: Resultssupporting

confidence: 89%

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The incorporation of europium into apatite: anew explanation

Holliday¹,

Dardenne²,

Walther³

et al. 2013

Radiochimica Acta

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Time resolved laser fluorescence spectroscopy (TRLFS) and X-ray absorption fine structure (XAFS) are used as complimentary techniques to show that the heterovalent incorporation of europium into apatite at temperatures relevant to environmental and biological processes occurs at grain boundaries and not the crystallographic calcium sites as previously presumed. For this study, we focus on mechanisms at the solid solution interface and therefore define this temperature regime as the range in which liquid water exists (0-100 • C). Site-selective TRLFS show that the local Eu 3+ symmetry does not match the presumed crystallographic site of incorporation. This is confirmed by XAFS results that show a deviation from the local environment in apatite. The transition of this amorphous europium to a crystallographic calcium site upon heating is then explained by grain growth and followed through a transition species by TRLFS.

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Section: Resultssupporting

confidence: 89%

“…This would be more likely than the previous explanation of ion diffusion from Ca(I) to Ca(II) in apatite at 480 • C [23,24]. Recently, it has been shown that the most probable diffusion pathways for Ca 2+ in apatite does not result in an exchange of Ca(I) and Ca(II) [34].…”

Section: Resultsmentioning

confidence: 77%

The incorporation of europium into apatite: anew explanation

Holliday¹,

Dardenne²,

Walther³

et al. 2013

Radiochimica Acta

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“…7 In this contribution, centrality measures are used to gain insight into ion conduction in solids. Mechanisms of conduction and activation barriers for transport of protons [8][9][10] and other ions 11,12 are sometimes determined based on conduction pathways built by concatenating single-step ion transfers between sites. This is true for many solid state conductors.…”

Section: Introductionmentioning

confidence: 99%

Centrality measures highlight proton traps and access points to proton highways in kinetic Monte Carlo trajectories

Krueger

Haibach²,

Fry

et al. 2015

The Journal of Chemical Physics

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A centrality measure based on the time of first returns rather than the number of steps is developed and applied to finding proton traps and access points to proton highways in the doped perovskite oxides: AZr 0.875 D 0.125 O 3 , where A is Ba or Sr and the dopant D is Y or Al. The high centrality region near the dopant is wider in the SrZrO 3 systems than the BaZrO 3 systems. In the aluminum-doped systems, a region of intermediate centrality (secondary region) is found in a plane away from the dopant. Kinetic Monte Carlo (kMC) trajectories show that this secondary region is an entry to fast conduction planes in the aluminum-doped systems in contrast to the highest centrality area near the dopant trap. The yttrium-doped systems do not show this secondary region because the fast conduction routes are in the same plane as the dopant and hence already in the high centrality trapped area. This centrality measure complements kMC by highlighting key areas in trajectories. The limiting activation barriers found via kMC are in very good agreement with experiments and related to the barriers to escape dopant traps. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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“…It is well established that Ca 2+ can move rapidly through negatively charged solid lattices, such as fluorapatite, by the process of exchange diffusion [ 10 ]. An analogous model, featuring negatively charged phospholipids (PLs), has been described previously [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Interfacial Exchange Diffusion Has the Potential to Augment Spatiotemporal Precision of Ca2+ Signaling

Breemen

Fameli²

2022

IJMS

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Nano-junctions between the endoplasmic reticulum and cytoplasmic surfaces of the plasma membrane and other organelles shape the spatiotemporal features of biological Ca2+ signals. Herein, we propose that 2D Ca2+ exchange diffusion on the negatively charged phospholipid surface lining nano-junctions participates in guiding Ca2+ from its source (channel or carrier) to its target (transport protein or enzyme). Evidence provided by in vitro Ca2+ flux experiments using an artificial phospholipid membrane is presented in support of the above proposed concept, and results from stochastic simulations of Ca2+ trajectories within nano-junctions are discussed in order to substantiate its possible requirements. Finally, we analyze recent literature on Ca2+ lipid interactions, which suggests that 2D interfacial Ca2+ diffusion may represent an important mechanism of signal transduction in biological systems characterized by high phospholipid surface to aqueous volume ratios.

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Divalent cation diffusion in calcium fluorapatite

Cited by 8 publications

References 23 publications

The incorporation of europium into apatite: anew explanation

The incorporation of europium into apatite: anew explanation

Centrality measures highlight proton traps and access points to proton highways in kinetic Monte Carlo trajectories

Two-Dimensional Interfacial Exchange Diffusion Has the Potential to Augment Spatiotemporal Precision of Ca2+ Signaling

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