Abstract
The measurements of pyroelectric current in needle shaped crystals of Bix Sb1-xSI (x = 0; 0.08; 0.17; 0.25; 0.50) were carried out by measuring the potential difference across a short-circuiting resistance, while heating the samples at uniform rates. Critical temperature Tc follows a rapid linear decrease when x increases up to 0.50, with a slope of 36 K per 0.10 Bi concentration. Critical exponent β of polarization, deduced from measurements of pyroelectric current, were obtained by using a Tc-independant method and generally these values seem consistent with a mean field theory. It is found that a tricritical point, where the phase transition changes from first to second order, occur at a value of X around 0.17. The appearance of a pyroelectric current above Tc, for those crystals which undergo a second order phase transition, can be explained by existence of an internal bias field.
Supported by J.N.I.C.T. Res.Grant 106.79.27 and I.N.I.C.(Portugal) and NATO res.Grant 1824.
Associated with the C.N.R.S. (France)
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© 1981 Plenum Press, New York
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Chaves, M.R., Amaral, M.H., Ziolkiewicz, S., Teng, M.K. (1981). Pyroelectric Effect and Ferroelectric Phase Transition in BixSb1-xSI. In: Devreese, J.T., Lemmens, L.F., Van Doren, V.E., Van Royen, J. (eds) Recent Developments in Condensed Matter Physics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1086-0_6
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DOI: https://doi.org/10.1007/978-1-4684-1086-0_6
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