Birefringence images of micropipes in 6H-SiC crystals along the c axis were

observed and simulated in detail. Based on Frank's theory, the intensity contours of

birefringence images for micropipes viewed end-on in 6H-SiC crystals were

derived by considering the photo-elastic anisotropy of silicon carbide. The results

were in good agreement with experimental observations.

Birefringence Images of Micropipes Viewed End-On in 6H-SiC Single Crystals.

L.Ning, X.Hu, X.Xu, X.Chen, Y.Wang, S.Jiang, J.Li: Journal of Applied

Crystallography, 2008, 41[5], 939-43