Microstructure and Phase Analysis of La0.8Ba0.2TixMn(1-x)O3 System for Microwave Absorber Material (x = 0 – 0.7)

Adi, Wisnu Ari; Manaf, A.

doi:10.4028/www.scientific.net/AMR.789.97

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Microstructure and Phase Analysis of La_0.8Ba_0.2Ti_xMn_(1-x)O₃ System for Microwave Absorber Material (x = 0 – 0.7)
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Microstructure and Phase Analysis of La_0.8Ba_0.2Ti_xMn_(1-x)O₃ System for Microwave Absorber Material (x = 0 – 0.7)

Abstract:

The synthesis and characterization of the magnetic materials of La0.8Ba0.2Mn (1-x)TixO3 system (x = 0 0.7) by mechanical alloying process have been performed. This magnetic material is prepared by oxides, namely La2O3, BaCO3, MnCO3 and TiO2. The mixture was milled for 10 h and then sintered at 1000 ° C for 10 h. The refinement results of x-ray diffraction pattern showed that the doping concentration (x < 0.5) was a single phase, which has a structure monoclinic (I12/a1) with lattice parameters a = 5.5169(5) Å, b = 5.5437(5) Å and c = 7.8553(7) Å, = 90o and 89.75(1) o, V = 240.25(4) Å3 and 6.345 gr.cm-3. The microstructure analysis showed that the particle shapes was polygonal with the varied particle sizes distributed homogeneously on the surface of the samples. We concluded that the maximum number of titanium atoms substituting manganese atom is around x ~ 0.43 without changing the structure of this system.

Info:

Periodical:

Advanced Materials Research (Volume 789)

Main Theme:

Advances in Materials, Processing and Manufacturing

Edited by:

Akhmad Herman Yuwono

Pages:

97-100

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.789.97

Citation:

W. A. Adi and A. Manaf, "Microstructure and Phase Analysis of La_0.8Ba_0.2Ti_xMn_(1-x)O₃ System for Microwave Absorber Material (x = 0 – 0.7)", Advanced Materials Research, Vol. 789, pp. 97-100, 2013

Online since:

September 2013

Authors:

Wisnu Ari Adi, A. Manaf

Keywords:

Crystal Structure, Magnetic, Manganite, Microstructure, Microwave Absorber

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Paper TitlePages

Electrical and Magnetic Studies of (La_0.5-xPr_xBa_0.5)(Mn_0.5Ti_0.5)O₃ as Multiferroic Material

Authors: Nor Hayati Alias, Abdul Halim Shaari, Wan Mohamad Daud Wan Yusoff, Che Seman Mahmood

Abstract: A new perovskite based titano-manganite (La_0.5-xPr_xBa_0.5)(Mn_0.5Ti_0.5)O₃ at x concentration 0, 0.01, 0.03, 0.05, 0.07 and 0.09 has been successfully prepared by ceramic solid-state technique at sintering temperature of 1300 °C. Dielectric electrical properties of the synthesized materials at frequency ranging from 5 Hz to 1 MHz and magnetic properties have been studied at room temperature. Analyses have been carried out to determine the structural, magnetic and dielectric properties of the synthesized material as a candidate of multiferroic material.

269

Microstructural Characterisation and Microwave Absorption Characteristics of La_(1-x)Ba_xFe_0.25Mn_0.5Ti_0.25O₃ (x = 0, 0.25, 0.75, 1)

Authors: Endyas Pratitajati, Azwar Manaf

Abstract: Perovskite lanthanum manganites, especially those doped LaMnO₃ (LMO), have shown potentials for applications in magnetic electronic functional materials. Partial substitution of La ion with divalent ions or Mn ion with trivalent ions gives rise to new properties. Substituted LMO has ability for absorbing electromagnetic waves. In this paper, we report recent investigations on substituted LaMnO₃ with designated La_(1-x)Ba_xFe_0.25Mn_0.5Ti_0.25O₃(x= 0, 0.25, 0.75, 1) compositions. Materials were prepared by mechanical alloying technique. After heat treatments at sintering temperatures 1100°C, 1200°C and 1300°C to the quasi-crystalline powders, presence of material phases were confirmed by XRD. Single phase material was obtained in samples of 0.25 x < 0.75 compositions. Mean crystallite size of sintered materials showed that crystallites were in a nanocrystalline regime. It is then concluded, during mechanically alloyed sintering powder materials, solid-state reaction and crystallisation promoted formation of particles containing nanocrystallites. Microwave absorption data showed that materials with large amount of substituted Ba ion gives broad absorption profiles. Total substitution of La by Ba ions (x=1) has significantly changed absorption profile. Smaller mean crystallite sizes indicated an increase in reflection loss value. In this report, empirical relationship between nanostructure and absorption profile of material is discussed.

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