Abstract
The thermal expansibilities and phase stabilities of AFe 2As 2 (A = Ca, Sr and Eu) have been investigated by powder diffraction techniques in the temperature range 5–600 K. We found the anisotropic thermal expansivities with temperature for all the compounds. The lattice parameter in the tetragonal phase ( A T) of CaFe 2As 2 contracts with increasing temperature, whereas C T expands. The rate of contraction in A T is lower than the rate of expansion in C T. Other compounds show normal thermal expansion behaviour along both a- and c-axes. In-plane expansion (i.e., along the a-axis) is found to be the smallest for EuFe 2As 2 and the highest for BaFe 2As 2. However, the rate of change of thermal expansivities along out-of-plane (i.e., along the c-axis) is higher as we go from Ba, Sr, Eu and Ca, respectively. Above 600 K, we notice the appearance /disappearance of certain reflections which suggest that tetragonal phase is not stable above this temperature for these compounds.
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Acknowledgements
The authors would like to thank Mr V B Jayakrishnan, Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, India for X-ray measurements.
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MISHRA, S.K., MITTAL, R., R KRISHNA, P.S. et al. Thermal expansion behaviour and phase stability of AFe2As2 (A = Ca, Sr and Eu) using powder diffraction technique. Pramana - J Phys 86, 1369–1381 (2016). https://doi.org/10.1007/s12043-016-1201-2
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DOI: https://doi.org/10.1007/s12043-016-1201-2
Keywords
- Ternary
- quaternary and multinary compounds (Fe-based superconductor)
- crystallographic aspects of phase transformations
- X-ray diffraction
- neutron diffraction and scattering