crystallite


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crystallite

[′kris·tə‚līt]
(geology)
A small, rudimentary form of crystal which is of unknown mineralogic composition and which does not polarize light.
References in periodicals archive ?
An ultrashort hard x-ray pulse, which is delayed relative to the pump pulse, is diffracted from the excited powder of crystallites to map the momentary spatial arrangement of electrons via an x-ray diffraction pattern.
where D is the crystallite size, K is the shape factor (K=0.9), [lambda] is the wavelength of the X-rays (for CuK[alpha] radiation), [[theta].sub.hkl] is the Bragg diffraction angle ([degrees]) and [[beta].sub.hkl] is the broadening of the hkl diffraction peak measured at half of its maximum intensity (in radians).
Using the Rietveld refinement and Warren-Averbach method [24, 25] in the frame of MAUD software [31], a detailed analysis of XRD profiles can be performed leading to the determination of phase composition in addition to structural and microstructural parameters for each phase, such as lattice parameters (a, b, c), the average crystallite size <L>, microstrain [<[[epsilon].sup.2]>.sup.1/2], and stacking fault probabilities (SFP).
The average crystallite size and crystal phase of calcium carbonate obtained from seashells were determined using X -ray diffraction analysis.
The average sizes of the crystallites, determined qualitatively by application of the Scherrer equation, were on the nanoscale.
From Fig.2 it is revealed that as the sintering temperature increased from 60 to 800[degrees]C, several of the HA peaks become more distinct and narrower signifying an increase in the crystallite size and crystallinity confirming the important role of sintering.
The results of the structural studies revealed that all samples had crystallites in the nanosize range; [Cu.sup.2+] addition into the Ti[O.sub.2] increases the crystallite size which maybe due to the replacement of [Ti.sup.4+] ions by [Cu.sup.2+] ions which have a higher ionic radius.
In terms of the FWHM, all samples experienced increase in crystallite sizes after annealing, with the samples grown at 1445 mV and 1450 mV showing the highest crystallite size of 63.02 nm.
X-ray diffraction shows that the synthesized ZnO nanoparticles have hexagonal crystal structure with an average crystallite size of 29 nm.
Where D is crystallite size (in nm), [lambda] is the radiation wavelength (for CuK[alpha] radiation, [lambda] 1.5406[Angstrom]), [theta] is the diffraction peak angle and [beta] is the broadening of the line ("half width") measured at half its maximum intensity (in radians).