J. Phys. II France
Volume 2, Numéro 7, July 1992
Page(s) 1383 - 1387
DOI: 10.1051/jp2:1992206
J. Phys. II France 2 (1992) 1383-1387

Instability of the lattice structure of crystalline liquids near the BPI-BPII phse transition

V.K. Dolganov and O.R. Lourie

Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow distr., Russia

(Received 16 April 1992, accepted 19 May 1992)

Essential change of the splitting between reflections (200) and (110) with temperature in the Blue Phase I (BPI) transmission spectrum in an electric field has been observed. The electrostriction coefficient $\gamma_{1111}$ in BPI increases anomalously, while approaching the BPI-BPII phase transition temperature. These results show that the phase transition is connected with lattice instability with increasing temperature.


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