Abstract
Dielectric properties of lithium–sodium–tetragermanate (LNG) LiNaGe4O9 crystal were investigated under hydrostatic pressure. The phase diagram and phase transition temperature as a function of pressure was constructed. Up to 200 MPa the dependence of TC on pressure is linear with negative slope of 8.5 K/GPa. The influence of pressure on the Curie–Weiss law was observed. It was also shown that with increasing pressure the maximum value of the electric permittivity and Curie–Weiss constant are decreasing. The obtained results revealed complex mechanism of phase transition in the ferroelectric LNG.
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