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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

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Structural phase transitions and magnetic order in SrTcO3.

Gordon J Thorogood¹, Maxim Avdeev, Melody L Carter

¹IME Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai NSW, 2234, Australia.

Dalton Transactions (Cambridge, England : 2003)

|June 10, 2011

Summary

Strontium technetate(III) oxide (SrTcO3) exhibits an orthorhombic structure due to TcO6 octahedra tilting. This perovskite displays a G-type antiferromagnetic structure below 1000 K, consistent across its crystal phases.

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Area of Science:

Materials Science
Solid-State Chemistry
Crystallography

Background:

Perovskite oxides are crucial in various technological applications.
Understanding the structural and magnetic properties of novel perovskites like SrTcO3 is essential for materials development.
Strontium technetate(III) oxide (SrTcO3) is a less-studied perovskite with potential for unique properties.

Purpose of the Study:

To elucidate the crystal structure of SrTcO3 across a range of temperatures.
To determine the magnetic ordering and structure of SrTcO3.
To investigate the relationship between crystal structure and magnetic properties in SrTcO3.

Main Methods:

Synchrotron X-ray powder diffraction was employed to analyze crystal structure.
Neutron powder diffraction was utilized for detailed structural and magnetic investigations.
Temperature-dependent diffraction studies were conducted from 4 K to 1023 K.

Main Results:

SrTcO3 adopts an orthorhombic structure at room temperature due to corner-sharing TcO6 octahedra tilting.
Heating SrTcO3 leads to sequential removal of octahedral tilts, transitioning through Pnma, Imma, I4/mcm, and finally Pm3m phases.
Below approximately 1000 K, SrTcO3 exhibits a G-type antiferromagnetic structure with collinear technetium moments aligned parallel to the c-axis (k=[0,0,0]).
This G-type antiferromagnetic structure remains consistent across all observed crystallographic phases.

Conclusions:

The crystal structure of SrTcO3 is temperature-dependent, featuring distinct phase transitions driven by octahedral tilting.
SrTcO3 possesses a robust G-type antiferromagnetic ordering that is independent of its crystallographic phase.
This study provides fundamental insights into the coupled structural and magnetic behavior of SrTcO3 perovskite.