Application of an Empirical FBRM Model to Estimate Crystal Size Distributions in Batch Crystallization

2014 ◽  
Vol 14 (2) ◽  
pp. 607-616 ◽  
Author(s):  
Huayu Li ◽  
Yoshiaki Kawajiri ◽  
Martha A. Grover ◽  
Ronald W. Rousseau
Keyword(s):  
Crystal Size ◽  
Size Distributions ◽  
Batch Crystallization ◽  
Crystal Size Distributions

Transient Nucleation in Co-Zr Metallic Glasses

1985 ◽  
Vol 57 ◽  
Author(s):  
Uwe Köster ◽  
Margret Blank-Bewersdorff
Keyword(s):  
Electron Microscopy ◽  
Metallic Glasses ◽  
Crystal Size ◽  
Time Lag ◽  
Size Distributions ◽  
Quantitative Electron Microscopy ◽  
Crystal Size Distributions ◽  
Different Temperatures ◽  
Transient Nucleation ◽  
Good Agreement

AbstractCrystallization kinetics and crystal size distributions in Co33Zr67-glasses have been analyzed by quantitative electron microscopy. The polymorphic crystallization of spherical CoZr2 crystals is very suitable reaction for such an analysis. Calculated crystal size distributions at different temperatures were compared to those experimentally revealed. Parameters controlling crystallization were varied within reasonable limits until theoretically calculated and experimentally observed crystal size distributions were in good agreement. It has been found that crystal size distribution can be explained by transient nucleation; the time lag and its temperature dependence can be evaluated. These results are discussed in the light of recent theories on transient nucleation.

Texture constraints on crystal size distribution methodology: An application to the Laki fissure eruption

2020 ◽  
Vol 105 (5) ◽  
pp. 585-598
Author(s):  
Kim A. Cone ◽  
Richard F. Wendlandt ◽  
Katharina Pfaff ◽  
Omero F. Orlandini
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Crystal Size ◽  
Crystal Size Distribution ◽  
Size Distributions ◽  
Backscatter Electron ◽  
Crystal Length ◽  
Crystal Size Distributions ◽  
Length Measurements ◽  
Scanning Electron

Abstract Modeling crystal size distributions often requires the extraction of 2D discrete crystal lengths to calculate 3D volumetric equivalences. These apparent lengths are obtained from digital images that exploit different physical and chemical characteristics of samples, and the choice of image type can affect the interpretation of crystal length measurements, thus affecting crystal size distribution modeling. To examine method- and texture-based effects on extracting crystal size distributions, we obtained plagioclase length measurements from two texturally opposing basaltic lava samples from the well-documented Laki fissure eruptions of 1783–1784. Using approaches that consider inherent texture-based limitations of 2D image types, we employed manual tracing and imaging software to extract plagioclase crystal lengths from three types of images: (1) photomicrographs from polarized-light microscopy, (2) backscatter electron images from scanning electron microscopy, and (3) energy-dispersive X-ray maps from automated mineralogy. Our results demonstrate that (1) phenocrysts (L ≥ 150 μm) and groundmass plagioclase (L < 150 μm) in our basalt samples appear with multiple aspect ratios, while the latter also display greater nucleation densities as crystal size population are continuously refined over increasingly smaller crystal lengths; (2) complex crystal clusters must be manually dissected into their discrete crystal components to produce meaningful crystal size distributions; (3) localized electron backscatter diffraction analysis reveals mild preferred orientation in complex clusters and groundmass, the latter confirmed by variations in crystal size distributions between orthogonal backscatter electron images; and (4) method-induced variations in both aspect ratio and crystal length determination can produce a wide range of kinetic interpretations that pose challenges for cross-research comparisons. For phenocrysts, compensating for clustering and fracturing through manual tracing remains the most effective method, while groundmass populations can be addressed with high-resolution (micrometer-scale) automated scanning electron microscopy for deciphering late-stage eruptive behavior. A texture-focused protocol should be established, as any kinetic information derived from crystal size distribution analyses across multiple studies employing multiple approaches cannot otherwise be directly compared.

A reevaluation of crystal-size distributions in chromite cumulates

1996 ◽  
Vol 81 (11-12) ◽  
pp. 1452-1459 ◽  
Author(s):  
C. Waters ◽  
A. E. Boudreau
Keyword(s):  
Crystal Size ◽  
Size Distributions ◽  
Crystal Size Distributions
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