Low-temperature lattice thermal expansion of the II-VI semiconductor ZnSe |
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Authors: | TV Anil K Shree Krishna Kumar |
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Institution: | a School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686 560, Kerala, India b School of Technology and Applied Sciences, Mahatma Gandhi University, Kottayam 686 041, Kerala, India |
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Abstract: | The low-temperature lattice thermal expansion of the wide gap semiconductor ZnSe is investigated using the quasi-harmonic theory of thermal expansion. The generalized Grüneisen parameters (GPs) of the elastic waves propagating in different directions with respect to the 001] crystallographic axis are calculated using the second-and third-order elastic constants. The values of the generalized GPs γj are generally positive except for γ2 from θ=25 to 65°. The Brugger gamma is calculated and the low-temperature limit of the Grüneisen gamma is determined using the procedure of Menon and Rao. The low-temperature limit has been obtained as 0.46 for ZnSe. The volume expansion is expected to be positive down to absolute zero for ZnSe, since is positive. |
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Keywords: | A Semiconductors D Thermal expansion |
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