Abstract
The birefringence topography of a Bi12GeO20 single crystal which has a strong natural optical activity is presented. The natural optical activity of the crystal may be completely compensated by reflection polarised light microscopy so that the birefringence images of dislocations and subboundaries are observed. The Burgers' vectors of dislocations were found to be of the types 1/2 〈1 1 1〉, 〈1 0 0〉 and 〈1 1 0〉 and dislocations which form subboundaries are also of these types.
Similar content being viewed by others
References
W. L. Bond andJ. Andrus,Phys Rev. 101 (1956) 1211.
R. Bullough,ibid. 110 (1958) 620.
V. L. Indenbom, V. I. Nikitenko andL. S. Milevski,Sov. Phys. Sol. Stat. 4 (1962) 162.
D. A. Jenkins andJ. J. Hren,Phil. Mag. 33 (1976) 173.
J. W. Matthews, E. Klokholm, V. Sadagopan, T. S. Plaskett andE. Mendel,Acta Metall. 21 (1973) 203.
D. J. Fathers andB. K. Tanner,Phil. Mag. 27 (1973) 17.
Idem, ibid. 28 (1973) 749.
B. K. Tanner andD. J. Fathers,ibid. 29 (1974) 1081.
J. W. Matthews, T. S. Plaskett andS. E. Blum,Crystal Growth 42 (1977) 621.
H. S. Bagdasarov andL. M. Doduk,Kristallogr. 15 (1970) 334.
J. W. Matthews andT. S. Plaskett,Phil. Mag. 33 (1976) 73.
S. Y. Shu (X. Y. Xu),Z. Z. Kuo andD. Fong,J. Phys. C6 (1980) 186.
S. Y. Shu andD. Fong,Acta Phys. Sin. 29 (1980) 1636.
S. C. Abrahams, P. B. Jamieson andJ. L. Bernstein,J. Chem. Phys. 47 (1967) 4035.
L. D. Landau andE. M. Lifshitz, “Electrodynamics of Continuous Media”, (Pergamon Press, Oxford, 1960) p. 337.
Z-G. Hu, G. Lu andX-C. Wang,Piezoelectrics and Acoustooptics 3 (1979) 12.
B. K. Tanner,Phil. Mag. 49 (1984) 435.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Xu, X.Y., Feng, D. Observation of dislocations and subboundaries in the optically active crystal Bi12GeO20 with reflection birefringence topography. J Mater Sci 20, 612–619 (1985). https://doi.org/10.1007/BF01026532
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01026532