Low frequency elastic behaviour of the ferroelastic phase transition of benzil

D. Havlik Institute for Experimental Physics, University of Vienna, Strudlhofgasse 4, A-1090, Wien, Austria; E-mail: [email protected]

W. Schranz Institute for Experimental Physics, University of Vienna, Strudlhofgasse 4, A-1090, Wien, Austria

H. Warhanek Institute for Experimental Physics, University of Vienna, Strudlhofgasse 4, A-1090, Wien, Austria

P. Zieliński Institute of Nuclear Physics, ul. Radzikowskiego 152, Krakow, Poland

M. More Institute of Nuclear Physics, ul. Radzikowskiego 152, Krakow, Poland

G. Odou Laboratoire de Dynamique et Structure des Matériaux Moléculaires, Univesité de Lille, U.R.A 801, Lille, France

Abstract

Benzil (C₆H₅—CO)₂ exhibits an order - disorder phase transition at T_c = 83.5 K, which leads the crystal from trigonal (P3₁21, Z = 3) high temperature phase to a monoclinic (P2₁, Z = 6) low temperature phase. We present the detailed low frequency (1 Hz) elastic measurements and thermal expansion data from 77K to 90K

The thermal expansivity shows only a small jump at T_c in z-direction, whereas it strongly increases perpendicular to the z-axes.

Longitudinal elastic compliances in z-direction (S₃₃) and perpendicular to z (S_⊥ = S₁₁ for T > T_c) show distinct (and different) anomalies around T_c.

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Low frequency elastic behaviour of the ferroelastic phase transition of benzil

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Low frequency elastic behaviour of the ferroelastic phase transition of benzil

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