Abstract
DURING the course of our investigations on photo-elasticity, we have found that single crystals of barium nitrate behave in many respects in an exceptional manner. Differences between the stress-optical constants as determined by a Babinet compensator are (q11q12) = 23·81 × 10-13, (q11q13) = 18·06 × 1013 and q44 = 1·62 × 10-13 C.G.s. units for the sodium D lines, (q11 q12) and (q11 q-13) furnish a measure of the birefringence caused when pressure is applied along a cube axis.
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References
Proc. Ind. Acad. Sci., 26, 97 (1947).
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BHAGAVANTAM, S., SURYANARAYANA, D. Photo-Elastic Effect in Barium Nitrate. Nature 162, 740 (1948). https://doi.org/10.1038/162740a0
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DOI: https://doi.org/10.1038/162740a0
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