Structural phase transitions and magnetic order in SrTcO3
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Date
2011-07-21
Journal Title
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Publisher
Royal Society of Chemistry
Abstract
The structure of the perovskite SrTcO3 has been investigated using both synchrotron X-ray and neutron powder diffraction. At room temperature SrTcO3 is orthorhombic as a consequence of cooperative tilting of the corner sharing TcO6 octahedra. The tilts are sequentially removed as the sample is heated with the oxide displaying the sequence of structres Pnma [rightward arrow] Imma [rightward arrow] I4/mcm [rightward arrow] Pm3[3 with combining macron]m. Neutron powder diffraction data collected in the temperature range 4-1023 K indicate that SrTcO3 has G-type antiferromagnetic structure, in which each Tc moment is antiparallel to its six nearest neighbours, below [similar]1000 K. The magnetic structure is collinear antiferromagnetic with the technetium moments parallel to c-axis and can be described by the propagation vector k = [0,0,0] and the basis vector (0,0,Az). The same magnetic structure is observed in each of the four crystal structures.© 2011, Royal Society of Chemistry
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Keywords
Crystal structure, Neutron diffraction, Ferromagnetism, Synchrotrons, Technetium, Wave propagation
Citation
Thorogood, G. J., Avdeev, M., Carter, M. L., Kennedy, B. J., Ting, J., & Wallwork, K. S. (2011). Structural phase transitions and magnetic order in SrTcO(3). Dalton Transactions, 40(27), 7228-7233. doi:10.1039/c1dt10445d