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  Alekseeva, O.A.; Naberezhnov, A.A.; Stukova, E.V.; Franz, A.; Baryshnikov, S.V.: Temperature range broadening of the ferroelectric phase in KNO₃ nanoparticles embedded in the pores of the nanoporous Al₂O₃ matrix. Ferroelectrics 574 (2021), p. 8-15

10.1080/00150193.2021.1888043

Abstract:
Temperature evolution of the crystal structure and the third harmonic coefficient of potassium nitrate KNO3 nanoparticles embedded in the pores of porous alumina oxide Al2O3 films with nanometer size channels has been studied. A significant expansion of the temperature range of the ferroelectric phase was found under conditions of the restricted geometry compared to the bulk material. Coexistence of the ferroelectric and paraelectric phases was revealed.