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  Alekseeva, O.; Naberezhnov, A.; Stukova, E.; Reehuis, M.: Study of structure and dielectric response of the ferroelectric composites (1-x)NaNO₂ + (x)KNO₂ at x=0.05, 0.1 and 0.2. Ferroelectrics 538 (2019), p. 6-11

10.1080/00150193.2019.1569979

Abstract:
The study of crystal structure temperature evolution of the ferroelectric composites (1 -x)NaNO2 + (x)KNO2 at x = 5, 10 and 20 vol. % has been performed by neutron diffraction. The temperature dependencies of the ferroelectric order parameter eta(T) for sodium nitrite have been determined in the composites and pure NaNO2. They coincide on heating and cooling and do not depend on KNO2 concentration. The increasing of KNO2 structural phase transition temperature (~10-15 K) has been revealed in the composites in comparison with pure KNO2.