Crystal structure — definition?
Arrangement of atoms or molecules in a crystal.
Symmetry — role?
Defines invariance under specific operations, classifying crystal symmetry.
Lattice parameters — include?
Lengths (a, b, c) and angles (α, β, γ).
Motif — function?
Atomic group attached to each lattice point.
Bravais lattice — total types?
14 distinct periodic arrangements.
Atomic position — expressed?
Fractional coordinates within the unit cell.
Crystal system — classification?
Seven groups based on symmetry and lattice parameters.
Space group — total?
230 unique symmetry groups.
Unit cell — smallest?
Repeating structural unit of a crystal.
Lattice — defines?
3D periodic array of points.
Diffraction — cause?
Wave interference from crystal lattice scattering.
Bragg law — formula?
2d sinθ = nλ.
Diffractometer — components?
X-ray source, sample holder, detector.
Diffractogram — analysis?
Identify phases by peak positions and intensities.
Quantitative analysis — measures?
Phase proportions via peak areas.
Structural analysis — determines?
Atomic arrangement via peak refinement.
Microstructure — studied by?
Peak broadening, grain size, defects.
Texture — refers to?
Preferred grain orientation.
Sample prep — importance?
Ensures accurate diffraction data.
Experimental conditions — affect?
Data quality and phase stability.
States of matter — include?
Solid, liquid, gas, amorphous phases.
Crystal structure — key?
Ordered atomic arrangement defining material properties.
Teste tes connaissances avec un QCM de 11 questions sur Fundamentals of Crystallography and Diffraction.
1. How many distinct three-dimensional Bravais lattices are there in crystallography?
2. What aspect of a crystal's internal structure primarily influences the diffraction pattern observed in X-ray experiments?
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