Moessbauer effect and x-ray diffraction at the high-spin (5T2) .dblharw. low-spin(1A1) transition in bis(thiocyanato)bis(4,7-dimethyl-1,10-phenanthroline)iron(II)-.alpha.-picoline: thermal hysteresis, associated crystallographic phase change, time dependence of 5T2 .fwdarw. 1A1 transition, particle size effects and related phenomena

1984 ◽  
Vol 23 (13) ◽  
pp. 1903-1910 ◽  
Author(s):  
E. Koenig ◽  
G. Ritter ◽  
S. K. Kulshreshtha ◽  
N. Csatary
Keyword(s):  
Particle Size ◽  
Phase Change ◽  
Time Dependence ◽  
High Spin ◽  
Size Effects ◽  
Thermal Hysteresis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Particle Size Effects

Particle size effects in the determination of respirable .alpha.-quartz by x-ray diffraction

1977 ◽  
Vol 49 (14) ◽  
pp. 2196-2203 ◽  
Author(s):  
J. W. Edmonds ◽  
W. W. Henslee ◽  
R. E. Guerra
Keyword(s):  
Particle Size ◽  
Size Effects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Particle Size Effects

Particle Size Effects in Geological Analyses by X-Ray Fluorescence

1985 ◽  
Vol 29 ◽  
pp. 587-592
Author(s):  
K.K. Nielson ◽  
V.C. Rogers
Keyword(s):  
Particle Size ◽  
Quantitative Analysis ◽  
Size Effects ◽  
Light Element ◽  
New Method ◽  
X Ray ◽  
Particle Size Effects ◽  
Sample Matrix ◽  
Xrf Analysis ◽  
The Matrix

Particle-size effects can cause significant errors in x-ray fluorescence (XRF) analysis of particulate materials. The effects are usually removed when samples are fused or dissolved to standardize the matrix for quantitative analysis. Recent improvements in numerical matrix corrections reduce the need to standardize the sample matrix via fusion or dissolution, particularly when the CEMAS method is used to estimate unmeasured light-element components of undefined materials for matrix calculations. A new method to correct for particle-size effects has therefore been examined to potentially avoid the need for destructive preparation of homogeneous samples.

Mineralogical Problems in X-Ray Emission Analysis of Sylvite Concentrates

1963 ◽  
Vol 7 ◽  
pp. 555-565
Author(s):  
Frank Bernstein
Keyword(s):  
Particle Size ◽  
Atomic Number ◽  
Size Effects ◽  
Quantitative Relationship ◽  
Minor Constituent ◽  
Emission Analysis ◽  
X Ray ◽  
Particle Size Effects ◽  
Chemical Combination ◽  
A Minor

AbstractMineralogical effects, which relate to the occurrence of an element in different forms of chemical combination, often are a problem to the X-ray analyst since these forms usually differ in X-ray sensitivity. An example of this is cited in connection with the analysis of sylvite concentrates for potassium. An evaluation is made of mineralogical effects and a quantitative relationship between X-ray intensity and mineral form and particle size is derived. If the particle size of a minor constituent is reduced sufficiently the mineralogical effect disappears. Target materials for X-ray sources are found to have only minor effects on relative intensities of different compounds of an element. Finally, it is concluded that the advantages of higher intensities gained through the use of target materials close in atomic number to the material being analyzed far outweigh particle size effects which are shown to be relatively small.

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