Incommensurate phase of (NH 4 ) 2 BeF 4 in an applied electric field
- 1 April 1984
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 53 (1) , 269-272
- https://doi.org/10.1080/00150198408245064
Abstract
The Landau theory developed predicts a narrower incommensurate phase of (NH4)2BeF4 in the presence of an applied bias electric field and allows the existence of a Lifshitz point in the phase diagram. The measurements of the dielectric constant ε, performed in the range of bias fields up to E ∼ 90 kV/cm, show a nonlinear variation of the incommensurate-commensurate transition temperature with E and also a large reduction of the incommensurate phase at highest E, at which the Lifshitz point has still not been reached.Keywords
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