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2 results on '"V. C. Padaki"'

1. Behaviour of ultrasonic velocities in amorphous Se90Ge10 and Se85Ge15 alloys near their glass transition

Author

S T Lakshmikumar, P E S Kartha, E. S. R. Gopal, and V. C. Padaki

Subjects
Condensed Matter::Materials Science, Materials science, Shear (geology), General Physics and Astronomy, Ultrasonic sensor, Composite material, Glass transition, Condensed Matter::Disordered Systems and Neural Networks, Amorphous solid
Abstract

Precise measurements of 10 MHz frequency longitudinal and shear wave velocities are reported in amorphous SeGe alloys near their glass transition temperature Tg. There is a sharp decrease of the velocities near Tg, but the reduction in velocities appears smaller than expected.

Published
1981
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2. Elastic constants of galena down to liquid helium temperatures

Author

S T Lakshmikumar, S. V. Subramanyam, V. C. Padaki, and E. S. R. Gopal

Subjects
Cryostat, Materials science, Liquid helium, law, Galena, Physics, engineering, Analytical chemistry, General Physics and Astronomy, Ultrasonic sensor, engineering.material, Single crystal, law.invention
Abstract

The elastic constants of single crystal galena have been determined from the measured ultrasonic velocities down to liquid helium temperature. A cryostat incorporating an arrangement to inject the liquid bonding material at low temperature is described. At 5 K, the values of elastic constants are C11=14.90, C12=3.51 and C44=2.92×1010 N/m2.

Published
1981
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