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Critical phenomena; binary systems; transport properties; critical indices; universality

The electrical resistance of the binary liquid system cyclohexane + acetic anhydride is measured, in the critical region, both in the pure mixture and when the mixture is doped with small amounts (≈ 100 ppm) of H₂O/D₂O impurities.T_c was approached to aboutt=3×10⁻⁶ wheret=(T −T_c)/T_c. The critical exponentb ≈ 0.35 in the fit of the resistance data to the equationdR/dT ∼t^−b does not seem to be affected appreciably by the impurities. There is a sign reversal ofdR/dt in the non-critical region. Binary liquid systems seem to violate the universality of the critical resistivity.

Anil Kumar¹ E S R Gopal¹

1. Department of Physics, Indian Institute of Science, Bangalore - 560 012

Published

May 1979

Manuscript received

21 November 1978

Manuscript revised

23 February 1979