Citation: Azeroual, H.; Bantignies, J.-L.; Maurin, D.; Granier, D.; Haines, J.; Cambon, O.; Hermet, P. (2023). Highlights on the reversible nonpolar-to-polar P3121-P31 phase transition at low temperature in NaLa(SO4)2·H2O: mechanism and piezoelectric properties.. Physical chemistry chemical physics : PCCP, 25, pp. 8168-8179.