scholarly journals Hydrothermal atomic force microscopy observations of barite step growth rates as a function of the aqueous barium-to-sulfate ratio

2016 ◽  
Vol 183 ◽  
pp. 1-13 ◽  
Author(s):  
Jacquelyn N. Bracco ◽  
Yiscka Gooijer ◽  
Steven R. Higgins
Keyword(s):  
Atomic Force Microscopy ◽  
Growth Rates ◽  
Force Microscopy ◽  
Atomic Force ◽  
Step Growth

EX SITU ATOMIC FORCE MICROSCOPY STUDIES OF SURFACE MORPHOLOGY ON {001} FACES OF MMTWD CRYSTALS

2006 ◽  
Vol 13 (05) ◽  
pp. 607-611
Author(s):  
X. J. LIU ◽  
X. Q. WANG ◽  
Z. Y. WANG ◽  
D. XU ◽  
G. W. YU ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Atomic Force Microscopy ◽  
Surface Morphology ◽  
Temperature Stress ◽  
Growth Rates ◽  
High Density ◽  
Ex Situ ◽  
Force Microscopy ◽  
Elementary Steps ◽  
Atomic Force

Surface morphology of the {001} faces of MMTWD crystals grown from by the temperature-lowering method has been studied. Monolayer and multilayer steps elongate along the a direction, which is determined by the crystal structure. Apart from that, the elementary steps have narrower terraces than the bunched ones, which may be resulting from the faster growth rates of the former than the latter. The formation of the protuberances at the step fronts is primarily associated with the uneven growth rates. The hollow cavities also elongate along the a direction, which demonstrates that the formation of them is also restricted by the crystal structure. Cracks are supposed to occur during harvesting, handling, or temperature stress afterwards. Growth of the 3D hillocks in high density can probably cause large stress and induce structure mismatch and serious cracks at the later stage.

Macro- to nanoscale study of the effect of aqueous sulphate on calcite growth

2008 ◽  
Vol 72 (1) ◽  
pp. 141-144 ◽  
Author(s):  
A. I. Vavouraki ◽  
C. V. Putnis ◽  
A. Putnis ◽  
E. H. Oelkers ◽  
P. G. Koutsoukos
Keyword(s):  
Atomic Force Microscopy ◽  
Growth Rates ◽  
Kinetics And Mechanism ◽  
Two Dimensional ◽  
Mixed Flow ◽  
Flow Reactors ◽  
Force Microscopy ◽  
Atomic Force

AbstractCalcite growth rates were measured in the presence of sulphate using mixed-flow reactors and in situ Atomic Force Microscopy. Preliminary observations reveal that the kinetics and mechanism of the calcite growth was altered by the presence of sulphate. Calcite growth rates in the presence of sulphate (≥ mM) were decreased and two-dimensional nuclei tend to grow on top of existing nuclei, rather than spreading. The height of new nuclei was ~4 Å, 1 Å greater than that of pure calcite growth. This difference reflects the incorporation of tetrahedral SO2-4 anions into the calcite lattice.

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