Unexpected wide tuning of ferroelectric properties by varying the Er concentration in La2-xErx(MoO4)3 (x = 0.75, 1, 1.25) solid solutions

Torres Betancort, Manuel Eulalio; Gil de Cos, G.

doi:10.1016/j.jssc.2022.123462

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Fecha

2022

URI

http://riull.ull.es/xmlui/handle/915/34897

Resumen

PowdersamplesoftheseriesLa2-xErx(MoO4)3(x¼0.75,1,1.25)werepreparedbysolid-statereactionfromthe LaandErtrimolybdates.Thecorrelationoftheferroelectricpropertieswiththecrystalstructure,asafunctionof thexconcentration,wasstudiedbyX-raydiffraction(XRD),dielectricandoptical spectroscopy,andtheferroelectrichysteresis loopmeasurements.Theβ0-Gd2(MoO4)3structuretypewas identifiedbyanon-conventional Rietveldmethod, includingasymmetryanalysis.Contrarytotheexpectations, theferroelectricpropertieswere intensifiedby theEr3þconcentration increase: themaximumpolarization forx¼1.25reachesoneorderof magnitudelargerthanthatofx¼0.75,andtheCurietemperatureincreasewasaround200K.Thisunexpected behavior isoppositeof thatobservedfortheimproperferroelectricsRE2(MoO4)3,wheretheferroelectricpropertiesareenhancedwiththeREionicradiusincrease.Hence, theseriesLa2-xErx(MoO4)3showan“widertuning range”forferroelectricpropertiesoppositetotherareearthtrimolybdatefamily

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