J. Phys. II France
Volume 2, Numéro 3, March 1992
Page(s) 279 - 284
DOI: 10.1051/jp2:1992132
J. Phys. II France 2 (1992) 279-284

Electrostriction dynamics of blue phase II crystallites

H.-S. Kitzerow1, P.P. Crooker1, J. Rand1, J. Xu2 and G. Heppke3

1  Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, U.S.A.
2  Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii 96822, U.S.A.
3  Iwan-N.-Stranski-Institut, Technische Universität Berlin, Sekr. ER 11, Str. des 17. Juni 135, 1000 Berlin 12, Germany

(Received 11 October 1991, accepted 20 December 1991)

The dynamics of electrostriction occurring in the cubic blue phase BPII is investigated. We find that the lattice constants relax exponentially and that the time constants are independent of the electric field strength. Near the BPI-BPII transition temperature, the time constants increase with increasing sample thickness. For higher temperatures, the time constants depend strongly on temperature as a result of the temperature-dependent crystallite dimensions. These results are discussed with respect to recent theories.

61.30 - 77.60 - 78.20J

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