K2O.7Nb2O5, P4/mbm,a = 27.5 Å, c = 3.94 Å

Precession ED by software control

Zhang, Grüner, Oleynikov, Wan, Hovmöller, Zou, submitted

Without precessionWith 1.1º precession

Comparison of SAED and precession ED data

K2O.7Nb2O5, P4/mbm,a = 27.5 Å, c = 3.94 Å

Taken by Daliang Zhang using Spinning Star

Phasing electron diffraction data by direct methods

Potential map obtained by direct method using Sir97

in a similar way as for X-ray diffraction ...

All Nb atoms are found from the potential map

Eward sphere

Crystalreciprocal lattice

Automated Electron Diffraction Tomography (ADT)

E. Mugnaioli, T. Gorelik, U. Kolb. Ultramicroscopy 109 (2009) 758

SpecimenGoniometer tilt

Series of tiltedelectron beam

Specimen

Electron beam tilt +

goniometer tilt

Automatic data collection by the rotation method

Zhang, Oleynikov, Hovmöller, Zou, Z. Kristallogr. 225 (2010) 94

Mugnaioli, Gorelik, Kolb. Ultramicroscopy 109 (2009) 758

Automated Electron Diffraction Tomography

Electron beam

Automatic ED data collection by combining beam rotation and goniometer tilt

K2O.7Nb2O5, P4/mbm, a = 27.5 Å, c = 3.94 Å

From -5 º to 5º

Zhang, Oleynikov, Hovmöller, Zou, Z. Kristallogr. 225 (2010) 94

Reconstructed 3D reciprocal lattice – Beta zeolite

A section of 145º with > 1450 ED frames can be collected in less than 60 minutes