Abstract
We have measured the composition dependence of the optical energy gap and thermal diffusivity in bulk As x Se1−x (0.10⩽x⩽0.50) glasses using photoacoustic technique. The energy gap shows a threshold minimum value and thermal diffusivity has a threshold maximum value at the stoichiometric composition As2Se3 corresponding tox=0.40. The decrease in energy gap is explained on the basis of chemical bonding. It is argued that the threshold percolation of rigidity in the random network is responsible for the peaking of the thermal diffusivity at the stoichiometric composition.
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References
Blachnik R and Hoppe H 1979J. Non-Cryst. Solids 34 191
Charpentier P, Lepoutre F and Bertrand L 1982J. Appl. Phys. 53 608
Chaudhuri P, Beardmore P and Bever M B 1966Phys. Chem. Glasses 7 157
Dohler G H, Dandoloff R and Bilz H 1980J. Non-Cryst. Solids 42 87
Gilroy K S and Phillips W A 1983Philos. Mag. B47 655
Griffiths J E, Espinosa G P, Remeika J P and Phillips J C 1982Phys. Rev. B25 1272
Kastner M 1972Phys. Rev. Lett. 28 355
Lachaine A and Poulet P 1984Appl. Phys. Lett. 45 953
Lucovsky G, Geils R H and Keezer R C 1977The physics of non-crystalline solids (ed.) G H Frischat (Switzerland: Trans Tech) p. 299
Lucovsky G and Hayes T M 1979Amorphous Semiconductors (ed.) M H Brodsky (Berlin: Springer-Verlag) p. 215
Madhusoodanan K N, Philip J, Parthasarathy G, Asokan S and Gopal E S R 1988Philos. Mag. B58 123
Madhusoodanan K N, Thomas M R and Philip J 1987J. Appl. Phys. 62 1162
Murase K and Fukunaga T 1984Optical effects in amorphous semiconductors (ed.) P C Tayler and S G Bishop (New York: AIP) p. 449
Murase K, Fukunaga T, Yakushiji K, Yoshimi T and Yuroki I 1983J. Non-Cryst. Solids 59–60 883
Myers M B and Felty E J 1967Mater. Res. Bull. 2 535
Nemanich R J, Connell G A N, Hayes T M and Street R A 1978Phys. Rev. B18 6900
Phillips J C 1979J. Non-Cryst. Solids 34 153
Phillips J C 1980Phys. Status Solidi B101 473
Phillips J C 1981J. Non-Cryst. Solids 43 37
Phillips J C 1981Phys. Today 35 27
Phillips J C 1985Phys. Rev. B31 8157
Phillips J C and Thorpe M F 1985Solid State Commun. 53 699
Sanderson R T 1971Chemical bonds and bond energy (New York: Academic Press)
Street R A, Nemanich R J and Connell G A N 1978Phys. Rev. B18 6915
Thorpe M F 1983J. Non-Cryst. Solids 57 355
White R M 1974J. Non-Cryst. Solids 16 387
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Madhusoodanan, K.N., Philip, J. Composition dependence of the energy gap and thermal diffusivity in bulk As-Se glasses. Pramana - J Phys 33, 705–712 (1989). https://doi.org/10.1007/BF02845696
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DOI: https://doi.org/10.1007/BF02845696