2006/01/23 by Y. Gagou, Gagou, Yaovi, Mimoun El Marssi +9
Engineering · Materials Science · #FOS: Physical sciences #Ferroelectric and Piezoelectric Materials #Glass properties and applications #Materials Science (cond-mat.mtrl-sci) #Microwave Dielectric Ceramics Synthesis
paper · pdf · doi:10.48550/arxiv.cond-mat/0601516
openalex publication_date 2006/01/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Experiments reveal that PbK2LiNb5O15 which belongs to the tetragonal tungsten bronze family presents paraelectric and ferroelectric phases and a complex structural change between them. High and low temperature phases are of symmetry P4/mbm and Pba2 respectively, so that this change is also of ferroelastic type. As presented here, crystallographic results hint at a displacive character of the ferroelectric ordering but show a more complex behaviour, with a clear order-disorder mechanism which accompanies the appearance of ferroelasticity. To complete our knowledge of this material, we have performed Raman experiments which exhibit a low frequency mode, but no clear soft mode is observed.