Abstract
The manganite perovskite polycrystal samples of (La1−x Dy x )2/3Sr1/3MnO3 (x = 0, 0.1, 0.2, 0.35, and 0.5) doped with Dy were prepared by solid state reaction in atmosphere to measure their X-ray diffraction (XRD) patterns, scanning electric microscope (SEM) images, infrared absorption spectra, and microwave electromagnetic properties. The displacement of the XRD peaks of the samples was found, and the 2ϑ increases from 0.05° to 0.5°. The grains of undoped La2/3Sr1/3MnO3 not only have the greatest size, but also the most regular shape. The size of the grains decreases as the Dy doping content increases from 0 to 0.5. The infrared absorption spectra of all samples were measured at room temperature. An absorption peak corresponding to the stretching vibration mode of Mn-O bonds appears within the range of 591–629 cm−1. The absorption peak shifts from a higher frequency to a lower one with the decrease of the average ionic radius of A-site. The frequency dependence of microwave-absorbing properties, imaginary components of the complex magnetic permeability μ″ and dielectric permeability ε″ for all samples was measured at room temperature from 8 to 13 GHz. The results show that the loss of microwave absorption can be attributed to both the magnetic and electric losses. The increase of Dy content not only enhances the microwave absorption but also causes the displacement of the absorption peaks.
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Tokura Y. and Tomioka Y., Colossal magnetoresistive manganites, J. Magn. Magn. Mater., 1999, 200: 1.
Dai D.S., Xiong G.C., and Wu S.C., Structures, electric and magnetic properties and colossal magnetoresistance of the RE1−x TxMnO3, Prog. Phys., 1997, 17: 201.
Chi E.O., Kwon Y.U., Kim J.T., and Hur N.H., Lattice effects on the magnetic and transport properties in La1.4Sr1.6−x AxMnO7 (A = Ca, Ba), Solid State Commun., 1999, 110: 569.
Alejandro G., Passeggi M.C., Vega D., Ramos C.A., Causa M.T., Tovar M., and Senis R., Temperature evolution of crystal field interactions across the Jahn-Teller transition in a La7/8Sr1/8MnO3 Single crystal, Phys. Rev. B, 2003, 68: 214429-1.
Wenbin W., Wong K.H., Li X.G., Choy C.L., and Zhang Y.H., Effect of annealing in reduced oxygen pressure on the electrical transport properties of epitaxial film and bulk (La1−x Ndx)0.7Sr0.3MnO3, J. Appl. Phys., 2000, 87: 3006.
Rana D.S., Kuberkar D.G., and Malik S.K., Field-induced abrupt change in magnetization of the manganite compounds (LaR)0.45(CaSr)0.55MnO3 (R = Eu and Tb), Phys. Rev. B, 2006, 73: 064407-1.
Sharma N., Nigam A.K., Pinto R., Venkataramani N., Prasad S., Chandra G., and Pai S. P., Giant Magnetoresistance studies on La(0.8−x )RxSr0.2MnO3 thin films (R = Pr, Nd, Gd, Ho), J. Magn. Magn. Mater., 1997, 166: 65.
Goodenough J.B., Theory of the Role Covalence in the Perovskite-Type Manganites [La,M(II)]MnO3, Phys. Rev., 1955, 100: 564.
Patil S.I., Ogale A.S., Shinde S.R., Kundaliya D.C., Ogale S.B., Bhagat S.M., and Venkatesan T., Grain-boundary control and low-field magnetoresistance in La0.7Sr0.3MnO3, J. Appl. Phys., 2005, 97: 10H707.
Moritomo Y., Maruyama Y., Akimoto T., and Nakamura A., Metal-insulator transition in layered manganites: (La1−z Ndz)1.2Sr1.8Mn2O7, Phys. Rev. B, 1997, 56: R7057.
Ogasawara H., Matsukawa M., Hatakeyama S., Yoshizawa M., Apostu M., Suryanarayanan R., Dhalenne G., Revcolevschi A., Itoh K., and Kobayashi N., Anomalous lattice distortion in pr-substituted double-layered perovskite manganite La1.2Sr1.8Mn2O7 single crystals, J. Phys. Soc. Jpn., 2000, 69: 1274.
Wang F., Gukasov A., Moussa F., Hennion M., Apostu M., Suryanarayanan R., and Revcolevschi A., Field-induced ferromagnetic metallic state of bilayer manganite (La0.4Pr0.6)1.2Sr1.8Mn2O7: A polarized neutron diffraction study, Phys. Rev. Lett., 2003, 91: 047204/1.
Nakamoto K., Infrared and Raman Spectra of Inorganic and Coordination Compounds, New York, Wiley, 1986: 148.
Calvani P., Paolone A., Dore P., Lupi S., Maselli P., Medaglia P.G., and Cheong S.W., Infrared response of ordered polarons in layered perovskites, Phys. Rev. B, 1996, 54: R9592.
Srinivasu V.V., Lofland S.E., and Bhagat S.M., Temperature and field dependence of microwave losses in manganite powders, J. Appl. Phys., 1999, 86: 1067.
Srinivasu V.V., Lofland S.E., and Bhagat S.M., Room temperature colossal microwave magnetoimpedance in micro-size powders of La0.7Ba0.3MnO3 and La0.7Sr0.3MnO3-A novel magnetic tape, J. Appl. Phys., 1998, 83: 2866.
Li G., Hu G.G., Zhou H.D., Fan X.J., and Li X.G., Absorption of microwaves in La1−x SrxMnO3 manganese powders over a wide bandwidth, J. Appl. Phys., 2001, 90: 5512.
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Liu, J., Yun, G. & Su, M. Crystal microstructure, infrared absorption, and microwave electromagnetic properties of (La1−x Dy x )2/3Sr1/3MnO3 . Rare Metals 28, 494–499 (2009). https://doi.org/10.1007/s12598-009-0096-1
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DOI: https://doi.org/10.1007/s12598-009-0096-1