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dc.contributor.authorArulraj, Anthony-
dc.contributor.authorRao, C N R-
dc.identifier.citationJournal of Solid State Chemistry 145(2), 557-563 (1999)en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractInfrared absorption spectra of rare earth manganates of the type La(0.7)A(0.3)MnO(3) (A = Pb, Sr, Ca) show that the compositions which are metallic at room temperature do not exhibit phonon bands, while the insulating compositions show sharp bands. La0.7Ca0.3MnO3 shows some changes in the phonon frequencies across the insulator-metal transition, but more importantly, the temperature variation of the relative band intensities parallels that of the electric resistivity. It appears that infrared absorption in these materials occurs when the resistivity is higher than Mott's maximum metallic resistivity. Infrared absorption spectra of Nd0.5Ca0.5MnO3, Y0.5Ca0.5MnO3, and Nd0.5Sr0.5MnO3 have been investigated through their charge-ordering transition temperatures. The band frequencies increase across the charge-ordering transition accompanied by a significant increase in the band intensities. The stretching and bending bands of the MnO6 octahedra show splittings in the charge-ordered manganates consistent with the occurrence of octahedral distortion. Some systematics in band frequencies are found with the average radius of A-site cations in Ln(0.5)A(0.5)MnO(3) (C) 1999 Academic Press.en_US
dc.publisherAcademic Press Incen_US
dc.rights© 1999 Academic Press Incen_US
dc.subjectA-Site Cationsen_US
dc.subjectAverage Radiusen_US
dc.titleAn Infrared Spectroscopic Study of the Insulator-Metal Transition and Charge-Ordering in Rare Earth Manganates, Ln(1-x)A(x)MnO(3) (Ln = Rare Earth, A = Ca, Sr, Pb)en_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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