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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate

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Published on: June 18, 2020

New synthesis route and magnetic structure of Tm2Mn2O7 pyrochlore.

Ekaterina Pomjakushina¹, Vladimir Pomjakushin², Katharina Rolfs¹

¹Laboratory for Developments and Methods, Paul Scherrer Institut (PSI) , 5232 Villigen, Switzerland.

Inorganic Chemistry

|September 3, 2015

Summary

Researchers developed a new synthesis for unstable Tm2Mn2O7 pyrochlore. This method yields a pure phase, revealing unique ferromagnetic and antiferromagnetic ordering with magnetostriction below 25 K.

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Area of Science:

Materials Science
Solid State Chemistry
Magnetism

Background:

Tm2Mn2O7 pyrochlore is thermodynamically unstable at ambient pressure.
Previous synthesis required high-pressure conditions using oxide precursors.

Purpose of the Study:

To establish a novel chemical route for synthesizing pure Tm2Mn2O7 pyrochlore.
To characterize the structural and magnetic properties of the synthesized Tm2Mn2O7.

Main Methods:

High-pressure chemical conversion of TmMnO3 at 1100 °C and 1300 bar oxygen pressure.
High-resolution neutron powder diffraction for structural analysis.
Symmetry analysis to determine magnetic structure.

Main Results:

A pure Tm2Mn2O7 pyrochlore phase (space group Fd3¯m) was successfully synthesized.
Below 25 K, a transition to a ferromagnetically ordered phase with antiferromagnetic canting was observed.
A distinct magnetostriction effect accompanied the magnetic transition.
The antiferromagnetic structure was solved within the I41/am'd' Shubnikov subgroup.

Conclusions:

A new, accessible synthesis route for Tm2Mn2O7 pyrochlore has been established.
The compound exhibits complex magnetic ordering and magnetostriction at low temperatures.
Detailed structural and magnetic characterization provides insights into pyrochlore materials.