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D. Chateigner, L. Lutterotti, O. Pérez, Ph. Boullay, B. Mc Mahon, J.R. Helliwell
IUT-UCBN, CRISMAT, Caen, France
Dept. Eng. Mat., Univ. Trento, I International Union of Crystallography, Chester, UK
X-rays and electrons diffraction for nanopowders
CODATA-VAMAS, Nano Task Group Workshop, Paris, 30-31st May 2013
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EMT nanocrystalline zeolite
Ng, Chateigner, Valtchev, Mintova: Science 335 (2012) 70
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Crystallite size (Å) along
Film thickness 10nm 15nm 20nm 25nm 35nm 40nm
[111] 176 153 725 254 343 379 [200] 64 103 457 173 321 386 [202] 148 140 658 234 337 381
10 nm 15 nm 20 nm
25 nm 35 nm 40 nm
Gold thin films
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Microstructure of nanocrystalline materials: TiO2 rutile
20nm
► quantitative analysis of electron powder diffraction (ring) pattern ?
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Intensity-spectra extraction
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Full-Pattern Search-Match
www.iutcaen.unicaen.fr
Rutile nanocrystalline Electron Powder Diffraction pattern
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<Rh> = R0 + R1P20(x) + R2P2
1(x)cosϕ + R3P21(x)sinϕ + R4P2
2(x)cos2ϕ + R5P22(x)sin2ϕ + ...
Reflection for 3h (100mg)
TEM in seconds (few µg)
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TiO2 nanopowders
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Popa R0 + R1
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Popa up to R4
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Why not more ?