A Survey on the Determination of Crystal Size in Powder Diffractometry

Guérin, Diego M. A.; Alvarez, A. G.

doi:10.1080/08893119508039924

Cited by 10 publications

(3 citation statements)

References 47 publications

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“…Moreover, the Fourier transform of the image in that specific region evidenced the presence of many crystalline individuals. In this case the evident disagreement between the size of gold particles measured by HRTEM and that calculated by XRD could be explained taking into account that, by HRTEM, we observe the effective particles dimension, connected to domains of polycrystalline gold particles, whereas the XRD results are related to coherently scattering domains [24].…”

Section: Physicochemical Characterization Of the Catalystsmentioning

confidence: 83%

A comparative study of nanosized IB/ceria catalysts for low-temperature water-gas shift reaction

Tabakova

Boccuzzi

Manzoli

et al. 2006

Applied Catalysis A: General

126

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Section: Physicochemical Characterization Of the Catalystsmentioning

confidence: 83%

A comparative study of nanosized IB/ceria catalysts for low-temperature water-gas shift reaction

Tabakova

Boccuzzi

Manzoli

et al. 2006

Applied Catalysis A: General

126

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“…Y is the total diffraction intensity; Q i is the individual diffraction intensity for each crystal part; n is the number of total diffraction peaks; R is the intensity of amorphous halo from non-crystalline part; G i and C i are Gaussian and Lorentz functions, respectively; f i is a fractional parameter; and a, b, c , and d are four constants. The crystallite size L is calculated by the Scherrer equation 39…”

Section: Methodsmentioning

confidence: 99%

Antimicrobial regenerated cellulose/nano-silver fiber without leaching

Chen

Sun

Jiang

et al. 2014

Journal of Bioactive and Compatible Polymers

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The formation of antimicrobial regenerated cellulose fibers using an ionic liquid solvent, 1-butyl-3-methylimidazolium chloride, and silver nanoparticles was studied. The cellulose preparation and dispersion efficiency of the silver nanoparticles in the solvent were evaluated via scanning electron microscope and transmission electron microscopy in terms of different processing conditions. The influence of silver nanoparticles on regenerated cellulose fiber crystallization and strength was examined using a wide angle X-ray diffractometry and tensiometry, respectively. The bioactive efficacy of the cellulose/nano-silver fiber was tested in accordance with the standard method of ASTM E 2149-10. The cellulose/nano-silver fibers were bioactive and killed Escherichia coli almost completely without any leaching problems. The addition of nano-silver significantly increased the cellulose fiber tensile strength and modulus with an insignificant reduction in fiber elongation, and a slower thermal decomposition rate, evidenced by increased fiber crystallinity. Higher processing temperatures improved the nano-silver dispersion efficiency. The final nano-silver suspension in the regenerated cellulose matrix was composed of scattered clusters with an average size of 700 nm and a distribution density of 14,098 mm−2.

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“…In effect, because fix) is not independent of either the crystallite shape or size distribution (Wilson, 1949;GuErin and Alvarez, 1995), a proper value of constant K, which is a function of reflection and crystallite shape, must be adopted if a "true" value of D is desired. If particle shape and size uniformity are assumed, K and D can be calcuhlted for several peaks by least-squares fit, as adopted by Stanjek (1991) for hematite.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Determination of Mean Crystallite Dimensions from X-Ray Diffraction Peak Profiles: A Comparative Analysis of Synthetic Hematites

Crosa

1999

Clays and clay miner.

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Abstract--X-ray diffraction (XRD) profile analysis of eight synthetic hematite samples was performed to identify the best parameters for determining the apparent mean crystallite dimension (D) and, consequently, surface area. The samples are comparable to soil hematite with respect to crystallinity. The procedure included: a) deconvolution of the XRD peaks to Gauss and Cauchy components and subtraction of the instrumental profile, b) determination of D from full-width at half-maximum, integral breadth, and integral breadth measurements of the Cauchy component, and c) comparison of deduced surface areas with those obtained by the N2-BET adsorption method. As expected, D values are strongly influenced by the broadening parameters. An appropriate selection of peaks is required to obtain size values along the crystallographic axes a (hkl: 110, 300) and c (hkl: 104, 116) and to calculate reliable surface areas. Using the Cauchy component of the above peaks, the calculated surface areas compared well with those measured by the N2-BET adsorption method.

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A Survey on the Determination of Crystal Size in Powder Diffractometry

Cited by 10 publications

References 47 publications

A comparative study of nanosized IB/ceria catalysts for low-temperature water-gas shift reaction

A comparative study of nanosized IB/ceria catalysts for low-temperature water-gas shift reaction

Antimicrobial regenerated cellulose/nano-silver fiber without leaching

Determination of Mean Crystallite Dimensions from X-Ray Diffraction Peak Profiles: A Comparative Analysis of Synthetic Hematites

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