Photo-elastic behaviour of ammonium alum crystals

Bhagavantam, S. ; Suryanarayana, D. (1949) Photo-elastic behaviour of ammonium alum crystals Acta Crystallographica, 2 (1). pp. 26-30. ISSN 0365-110X

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To test an earlier prediction by Bhagavantam, based on a group theoretical method, that the T-23 and Tk-2/m 3̅ classes of the cubic system need four independent constants, instead of three, for describing their photo-elastic properties, crystals of ammonium alum belonging to the Tk - 2/m 3̅ class were studied completely. It was found that, the crystal needs four independent constants and all the four stress-optical constants of alum have been determined. For sodium D light, they are (q11-q12)=-5.93 × 10-13, (q11-q13)= -5.25 × 1013, q44=-1.15 × 1013, q11= 5.5 × 10-13, q12=11.6 × 1012, q13= 10.9 × 10-13 cm.2 dyno-1. The values of the strain-optical constants are (p11-p12)= -0.0854, (p11-p13)=-0.0756, p44=-0.0092. p11=0.38, p12=0.40, p13=0.45.

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Deposited On:11 Dec 2010 07:52
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