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Tanaka Patterns

Tanaka Patterns. Large-Angle Convergent-Beam Diffraction LACBED. The Tanaka Methods. Traditional microscopy taught that the microscope should be focussed on the specimen or on the diffraction pattern in the back focal plane.

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Tanaka Patterns

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  1. Tanaka Patterns Large-Angle Convergent-Beam Diffraction LACBED

  2. The Tanaka Methods • Traditional microscopy taught that the microscope should be focussed on the specimen or on the diffraction pattern in the back focal plane. • Tanaka liberated us and gave rise to a family of new techniques by telling us to look in other places.

  3. GaAs K. Christenson

  4. GaAs [100] K. Christenson

  5. M. Kaufman

  6. Ni3Mo

  7. Ni3Mo BF Tanaka pattern

  8. Ni3Mo

  9. Ni3Mo DF Tanaka pattern

  10. Al layer on GaAs Tanaka Group

  11. Defect Analysis • Large-Angle Convergent-Beam patterns provide an alternative method of determining the Burgers vectors of dislocations. (And characterizing other defects.) • The dislocations have to be well separated.

  12. Fe,30Ni,19Cr [114] Cherns and Preston

  13. Fe,30Ni,19Cr [114] Cherns and Preston

  14. Fe,30Ni,19Cr [114] Cherns and Preston

  15. Si TanakaGroup

  16. g.b = n g is the reciprocal lattice vector corresponding to the diffracting planes b is the Burgers vector of the dislocation n is the number of lines of no contrast

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