Characterization of the core structure of growth defects in CVD diamond films by UHREM : Z-shaped twin interactions D. Dorignac, S. Delclos, F. Phillipp, F. Silva et A. Gicquel J. Phys. IV France, 11 PR3 (2001) Pr3-971-Pr3-978 DOI: 10.1051/jp4:20013122