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

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Author
Torres Betancort, Manuel EulalioULL authority; Gil de Cos, G.
Date
2022
URI
http://riull.ull.es/xmlui/handle/915/34897
Abstract
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
Licencia Creative Commons (Reconocimiento-No comercial-Sin obras derivadas 4.0 Internacional)
Except where otherwise noted, this item's license is described as Licencia Creative Commons (Reconocimiento-No comercial-Sin obras derivadas 4.0 Internacional)