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Descripción
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| WehavesynthesizedanewBi0.5Pb0.5CrO3 perovskitephasebymeansofahighpressurereactionat 70 kbarand1000 1C. Thedistortedorthorhombicperovskitestructurecanbeindexedinthespacegroup Pnma with latticeparameters a¿5.4768(1)Å, b¿7.7450(2)Å,and c¿5.4574(1)Åatroomtemperature, but undergoesastructuralphasetransitionandentersintoa P21/m monoclinic distortedperovskite phase below150Kwith a¿5.4173(2), b¿7.7286(4)and c¿5.4930(3).Thestructuraltransitionis coincident withtheonsetofmagneticinteractions.Atlowertemperaturesaweakferromagnetic structure isevidentrelatedtoantiferromagneticCr-spincantingandaspin-glasstransitionisobserved at E40 K.Thesemiconducting-typeelectricalresistivityisrelativelylow,associatedwithCr3þ/Cr4þ electron hopping,andshowsconsiderablemagneto-resistance(upto15%).Duetothelowresistivitythe dielectric permittivity ?r could bedeterminedonlybelow To80 Ktobe E300anddidnotshowany strong temperature-dependence.Ferroelectricitywasnotdetectedinthe T-rangeinvestigatedandno magnetocapacitance effectswereobserved. | |
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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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Journal of Solid State Chemistry |
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ISSN
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0022-4596 |
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Factor de impacto JCR
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2,2 |
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Información de impacto
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Datos JCR del año 2013 |
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Volumen
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225 |
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DOI
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Número de revista
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Desde la página
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321 |
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Hasta la página
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329 |
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Mes
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SIN MES |
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Ranking
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