Preparation and characterization of praseodymium calcium manganate

M. W. Jung, J. Tao, W. M. Kriven, J. Schneider

Research output: Contribution to journalArticle

Abstract

The magnetoresistive manganese oxide, Pr0.46Ca0.54MnO3 was synthesized by a sol-gel process involving a stable metal chelate complex with acetylacetone. Manganese(III), calcium(II) 2,4-pentadionate and praseodymium nitrate were readily dissolved and mixed in solution. Since the type of ligand could affect the type of bonding in the mixed oxide materials, the structural evolution of the reaction mixture was monitered by carbon-13 nuclear magnetic resonance (13C NMR) and Fourier transform infrared (FT-IR) spectroscopy. The calcining temperature was determined from differential scanning calorimetry (DSC) and thermogravimetric analysis. The crystallized powders were examined by X-ray diffractometry (XRD) and Rietveld profile fitting. The microstructure and morphology were characterized by scanning electron microscopy/energy-despersive (X-ray) spectrometry (SEM/EDS) and found to be homogeneous. Transmission electron microscopy/selected area diffraction (TEM/SAD) observed charge ordering at 180 K which disappeared by room temperature. The magnetic properties were investigated as a function of temperature and found to be consistent with TEM/SAD and XRD observations.

Original languageEnglish (US)
Pages (from-to)778-784
Number of pages7
JournalMaterials Chemistry and Physics
Volume78
Issue number3
DOIs
StatePublished - Feb 28 2003

Keywords

  • Acetylacetone
  • C NMR
  • Magnetoresistive
  • Sol-gel
  • TEM

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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