Microstructural characterisation and microwave absorption characteristics of La(1-x)BaxFe0.25Mn0.5Ti0.25O3 (x = 0, 0.25, 0.75, 1)

Endyas Pratitajati, Azwar Manaf

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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)BaxFe0.25Mn0.5Ti0.25O3 (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 Nano crystalline regime. It is then concluded, during mechanically alloyed sintering powder materials, solid-state reaction and crystallisation promoted formation of particles containing Nano crystallites. 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.

Original languageEnglish
Title of host publicationAdvances in Materials, Processing and Manufacturing
Pages161-166
Number of pages6
DOIs
Publication statusPublished - 29 Oct 2013
Event13th International Conference on Quality in Research, QiR 2013 - Yogyakarta, Indonesia
Duration: 25 Jun 201328 Jun 2013

Publication series

NameAdvanced Materials Research
Volume789
ISSN (Print)1022-6680

Conference

Conference13th International Conference on Quality in Research, QiR 2013
CountryIndonesia
CityYogyakarta
Period25/06/1328/06/13

Keywords

  • Lanthanum manganite
  • Mechanical alloying
  • Microwave absorbers
  • Nano crystalline materials
  • Nanoparticles
  • Particle size

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