Article
Licensed
Unlicensed
Requires Authentication
AFM study of the epitaxial growth of brushite (CaHPO4·2H2O) on gypsum cleavage surfaces
-
André Jorge Pinto
,
Christine V. Putnis
Published/Copyright:
April 2, 2015
Abstract
The epitaxial overgrowth of brushite (CaHPO4·2H2O) by the interaction of phosphate-bearing, slightly acidic, aqueous solutions with gypsum (CaSO4·2H2O) was investigated in situ using atomic force microscopy (AFM). Brushite growth nuclei were not observed to form on the {010} gypsum cleavage surface, but instead formed in areas of high dissolution, laterally attached to gypsum [101] step edges. During the brushite overgrowth the structural relationships between brushite (Aa) and gypsum (A2/a) result in several phenomena, including the development of induced twofold twining, habit polarity, and topographic effects due to coalescence of like-oriented crystals. The observed brushite growth is markedly anisotropic, with the growth rate along the main periodic bond chains (PBCs) in the brushite structure increasing in the order [101] > [101] > [010], leading to tabular forms elongated on [101]. Such a growth habit may result from the stabilization of the polar [101] direction of brushite due to changes in hydration of calcium ions induced by the presence of sulfate in solution, which is consistent with the stabilization of the gypsum [101] steps during dissolution in the presence of HPO2-4 ions. The coupling between growth and dissolution was found to result in growth rate fluctuations controlled by the changes in the solution composition.
Received: 2010-3-15
Accepted: 2010-7-2
Published Online: 2015-4-2
Published in Print: 2010-11-1
© 2015 by Walter de Gruyter Berlin/Boston
You are currently not able to access this content.
You are currently not able to access this content.
Articles in the same Issue
- Characterization of cation environments in polycrystalline forsterite by 25Mg MAS, MQMAS, and QCPMG NMR
- Structure of nanocrystalline phyllomanganates produced by freshwater fungi
- First-principles study on variation of lattice parameters of mullite Al4+2xSi2–2xO10–x (x = 0.125, 0.250, 0.375)
- Natrolite may not be a “soda-stone” anymore: Structural study of fully K-, Rb-, and Cs-exchanged natrolite
- Metal retention, mineralogy, and design considerations of a mature permeable reactive barrier (PRB) for acidic mine water drainage in Northumberland, U.K.
- A relationship between d104 value and composition in the calcite-disordered dolomite solid-solution series
- XRD, micro-XANES, EMPA, and SIMS investigation on phlogopite single crystals from Mt. Vulture (Italy)
- Volume behavior of the 10 Å phase at high pressures and temperatures, with implications for H2O content
- Interfacial tension between immiscible liquids in the system K2O-FeO-Fe2O3-Al2O3-SiO2 and implications for the kinetics of silicate melt unmixing
- H2O and the dehydroxylation of phyllosilicates: An infrared spectroscopic study
- Effects of intermediate range structure on the 29Si NMR chemical shifts of framework silicates: Results for analcime
- High-temperature Mössbauer spectroscopy: A probe for the relaxation time of Fe species in silicate melts and glasses
- The thermal equation of state of FeTiO3 ilmenite based on in situ X-ray diffraction at high pressures and temperatures
- OH species, U ions, and CO/CO2 in thermally annealed metamict zircon (ZrSiO4)
- Crystallographic and chemical constraints on the nature of the proustite–pyrargyrite solid-solution series
- Accurate μRaman characterization of reaction products at the surface of (bio)oxidized pyrite
- Determination of manganese valence states in (Mn3+, Mn4+) minerals by electron energy-loss spectroscopy
- AFM study of the epitaxial growth of brushite (CaHPO4·2H2O) on gypsum cleavage surfaces
- Compressibility of protoamphibole: A high-pressure single-crystal diffraction study of protomangano-ferro-anthophyllite
- Crystal structure of hydrous wadsleyite with 2.8% H2O and compressibility to 60 GPa
- Dehydration and rehydration processes in gmelinite: An in situ X-ray single-crystal study
- Characteristics of emission centers in alkali feldspar: A new approach by using cathodoluminescence spectral deconvolution
- Mechanism of metamorphic zircon growth in a granulite-facies quartzite, Adirondack Highlands, Grenville Province, New York
- Speciation and mixing behavior of silica-saturated aqueous fluid at high temperature and pressure
- A critical comment on Thy et al. (2009b): Liquidus temperatures of the Skaergaard magma
Articles in the same Issue
- Characterization of cation environments in polycrystalline forsterite by 25Mg MAS, MQMAS, and QCPMG NMR
- Structure of nanocrystalline phyllomanganates produced by freshwater fungi
- First-principles study on variation of lattice parameters of mullite Al4+2xSi2–2xO10–x (x = 0.125, 0.250, 0.375)
- Natrolite may not be a “soda-stone” anymore: Structural study of fully K-, Rb-, and Cs-exchanged natrolite
- Metal retention, mineralogy, and design considerations of a mature permeable reactive barrier (PRB) for acidic mine water drainage in Northumberland, U.K.
- A relationship between d104 value and composition in the calcite-disordered dolomite solid-solution series
- XRD, micro-XANES, EMPA, and SIMS investigation on phlogopite single crystals from Mt. Vulture (Italy)
- Volume behavior of the 10 Å phase at high pressures and temperatures, with implications for H2O content
- Interfacial tension between immiscible liquids in the system K2O-FeO-Fe2O3-Al2O3-SiO2 and implications for the kinetics of silicate melt unmixing
- H2O and the dehydroxylation of phyllosilicates: An infrared spectroscopic study
- Effects of intermediate range structure on the 29Si NMR chemical shifts of framework silicates: Results for analcime
- High-temperature Mössbauer spectroscopy: A probe for the relaxation time of Fe species in silicate melts and glasses
- The thermal equation of state of FeTiO3 ilmenite based on in situ X-ray diffraction at high pressures and temperatures
- OH species, U ions, and CO/CO2 in thermally annealed metamict zircon (ZrSiO4)
- Crystallographic and chemical constraints on the nature of the proustite–pyrargyrite solid-solution series
- Accurate μRaman characterization of reaction products at the surface of (bio)oxidized pyrite
- Determination of manganese valence states in (Mn3+, Mn4+) minerals by electron energy-loss spectroscopy
- AFM study of the epitaxial growth of brushite (CaHPO4·2H2O) on gypsum cleavage surfaces
- Compressibility of protoamphibole: A high-pressure single-crystal diffraction study of protomangano-ferro-anthophyllite
- Crystal structure of hydrous wadsleyite with 2.8% H2O and compressibility to 60 GPa
- Dehydration and rehydration processes in gmelinite: An in situ X-ray single-crystal study
- Characteristics of emission centers in alkali feldspar: A new approach by using cathodoluminescence spectral deconvolution
- Mechanism of metamorphic zircon growth in a granulite-facies quartzite, Adirondack Highlands, Grenville Province, New York
- Speciation and mixing behavior of silica-saturated aqueous fluid at high temperature and pressure
- A critical comment on Thy et al. (2009b): Liquidus temperatures of the Skaergaard magma
