The effects of pressure on the lattice of the rare-earth-based perovskite-type oxides SmAlO3 and NdAlO3
This paper studies the behavior of SmAlO _3 and NdAlO _3 when they are subject to high pressures. This work is undertaken using angle-dispersive synchrotron x-ray powder diffraction and Raman spectroscopy at pressures up to 24.2 and 39.0 GPa, respectively. It is found that SmAlO _3 undergoes an orth...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ac9b82 |
| Summary: | This paper studies the behavior of SmAlO _3 and NdAlO _3 when they are subject to high pressures. This work is undertaken using angle-dispersive synchrotron x-ray powder diffraction and Raman spectroscopy at pressures up to 24.2 and 39.0 GPa, respectively. It is found that SmAlO _3 undergoes an orthorhombic ( Pnma ) to rhombohedral ( R -3 c ) structure transition at around 10 GPa; this transition is induced by the rotation of the AlO _6 octahedra toward that of the ideal perovskite structure when the material is subject to high pressures. The tilting of the AlO _6 octahedra also decreases at high pressures in NdAlO _3 . It is found that NdAlO _3 maintains its original rhombohedral structure for pressures of up to 39.0 GPa. The structural changes observed in these compounds help establish the electrical and magnetic properties of RAlO _3 (R = Sm or Nd) at high pressures. |
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| ISSN: | 1367-2630 |