Anharmonic force constants of GaSb from the measured third order elastic constants at 300°K |
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Authors: | V Sundara Raja P Jayarama Reddy |
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Institution: | (1) Physics Department, Sri Venkateswara University, 517502 Tirupati;(2) Department of Physics, S.V. Agricultural College, Tirupati |
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Abstract: | The third-order elastic constants of single crystal GaSb are determined using ultrasonic pulse interferometer at 10 MHz. The
constants at 300°K, in units of 1011 N.m.−2, are Cl11 = ™ 4 ·75 ± 0·06 C144 = + 0·50 ± 0·25 C113 = ™ 3 ·08 ± 0·02 C166 = ™ 2·16 ± 0·13 C123 = ™ 0 ·44 ± 0·29 C456 = ™ 0·25 ± 0·15 These constants are used to evaluate the three anharmonic first and second neighbour force constants based
on modified Keating’s model. The constants are (in units of 1011 N.m−2)γ=− 2·406;δ=0·407;ε=−0·222. |
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Keywords: | Third-order elastic constants GaSb ultrasonic pulse interferometer anharmonic force constants |
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