Preparation and characterization of praseodymium calcium manganate

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

doi:10.1016/S0254-0584(02)00385-1

Preparation and characterization of praseodymium calcium manganate

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

Research output: Contribution to journal › Article › peer-review

Abstract

The magnetoresistive manganese oxide, Pr_0.46Ca_0.54MnO₃ 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 language	English (US)
Pages (from-to)	778-784
Number of pages	7
Journal	Materials Chemistry and Physics
Volume	78
Issue number	3
DOIs	https://doi.org/10.1016/S0254-0584(02)00385-1
State	Published - Feb 28 2003

Keywords

Acetylacetone
C NMR
Magnetoresistive
Sol-gel
TEM

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

Online availability

10.1016/S0254-0584(02)00385-1

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title = "Preparation and characterization of praseodymium calcium manganate",

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.",

keywords = "Acetylacetone, C NMR, Magnetoresistive, Sol-gel, TEM",

author = "Jung, {M. W.} and J. Tao and Kriven, {W. M.} and J. Schneider",

note = "Funding Information: The authors gratefully acknowledge the technical assistance of Prof. M. Solomon and S. Bailey of the Physics Department, Prof. J.M. Zuo, D.K. Kim and V. Petrov. This paper was supported by the grant for professors of Sungshin Women{\textquoteright}s University, Korea, in 2001, and by the National Science Foundation, Grant # NSF DMR 99-72114. The use of the facilities in the Center for Microanalysis of Materials in the Frederick Seitz Materials Research Laboratory at UIUC is acknowledged.",

year = "2003",

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day = "28",

doi = "10.1016/S0254-0584(02)00385-1",

language = "English (US)",

volume = "78",

pages = "778--784",

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T1 - Preparation and characterization of praseodymium calcium manganate

AU - Jung, M. W.

AU - Tao, J.

AU - Kriven, W. M.

AU - Schneider, J.

N1 - Funding Information: The authors gratefully acknowledge the technical assistance of Prof. M. Solomon and S. Bailey of the Physics Department, Prof. J.M. Zuo, D.K. Kim and V. Petrov. This paper was supported by the grant for professors of Sungshin Women’s University, Korea, in 2001, and by the National Science Foundation, Grant # NSF DMR 99-72114. The use of the facilities in the Center for Microanalysis of Materials in the Frederick Seitz Materials Research Laboratory at UIUC is acknowledged.

PY - 2003/2/28

Y1 - 2003/2/28

N2 - 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.

AB - 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.

KW - Acetylacetone

KW - C NMR

KW - Magnetoresistive

KW - Sol-gel

KW - TEM

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SN - 0254-0584

VL - 78

SP - 778

EP - 784

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 3

ER -

Preparation and characterization of praseodymium calcium manganate

Abstract

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