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Physical & Chemical properties

Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study has been conducted according to ISO 13320:2009.
Qualifier:
according to guideline
Guideline:
other: ISO 13320:2009 "Particle size analysis - Laser diffraction methods"
Deviations:
not specified
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Mass median aerodynamic diameter:
72.76 µm
Percentile:
D10
Mean:
27.45 µm
St. dev.:
1.35
Remarks on result:
other: "According to ISO 13320 the relative standard deviation for d50 is smaller than 3 %, for d10 and d90 smaller than 5 %. For powders below 10 µm these maximum values should be doubled."
Key result
Percentile:
D50
Mean:
72.76 µm
St. dev.:
2.15
Remarks on result:
other: "According to ISO 13320 the relative standard deviation for d50 is smaller than 3 %, for d10 and d90 smaller than 5 %. For powders below 10 µm these maximum values should be doubled."
Percentile:
D90
Mean:
117.6 µm
St. dev.:
5.88
Remarks on result:
other: "According to ISO 13320 the relative standard deviation for d50 is smaller than 3 %, for d10 and d90 smaller than 5 %. For powders below 10 µm these maximum values should be doubled."

Results of the volumetric distribution of the particle sizes:

D (v, 0.1)

27.45 µm

D (v, 0.5)

72.76 µm

D (v, 0.9)

117.60 µm
Conclusions:
The particle size distribution of Gd2Zr2O7 was determined by laser diffraction in water as dispersion liquid.
Mean diameters (distribution type: volume) applying Fraunhofer approximation:
D (v, 0.1) = 27.45 μm
D (v, 0.5) = 72.76 μm
D (v, 0.9) = 117.5 μm
Executive summary:

The particle size distribution has been evaluated according to ISO 13320:2009 applying the laser diffraction method. Therefore, a sample of the test substance has been dispersed in water and passed through a monochromatic laser beam. Scattering patterns of the particles were detected and the volumetric particle size distribution is determined by applying Fraunhofer approximation:

D (v, 0.1) = 27.45 μm

D (v, 0.5) = 72.76 μm

D (v, 0.9) = 117.5 μm

Description of key information

The particle size distribution has been evaluated according to ISO 13320:2009 applying the laser diffraction method. Therefore, a sample of the test substance has been dispersed in water and passed through a monochromatic laser beam. Scattering patterns of the particles were detected and the volumetric particle size distribution is determined by applying Fraunhofer approximation:

D (v, 0.1) = 27.45 μm

D (v, 0.5) = 72.76 μm

D (v, 0.9) = 117.5 μm

Additional information