Highly stable cooperative distortion in a weak Jahn-Teller d 2 cation: Perovskite-type ScVO 3 obtained by high-pressure and high-temperature transformation from bixbyite
| Autor: | Mario Bieringer, Shahid P. Shafi, Elizabeth Castillo-Martínez, Miguel Á. Alario-Franco, Lachlan M. D. Cranswick |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Jahn-Teller
Vector spaces synthesis Perovskite phase Jahn–Teller effect scandium Vanadium chemistry.chemical_element Vanadium ions Triclinic crystal system Bixbyite Perovskite Biochemistry Catalysis high temperature Tetragonal crystal system Colloid and Surface Chemistry High-pressure and high-temperature Antiferromagnetism Electric conductivity Propagation vector Electrical conductivity Vanadium alloys Room temperature Orthorhombic symmetry Magnetic moment Chemistry ferromagnetic material Triclinic symmetry General Chemistry Antiferromagnetics Lattice parameters Long-range ordering cation Crystallography Space Groups Oxygen octahedra Positive ions magnetism Magnetic moments Orthorhombic crystal system Orthorhombic perovskite ion oxygen Magnetic superstructures |
| Popis: | A novel ScVO 3 perovskite phase has been synthesized at 8 GPa and 1073 K from the cation-disordered bixbyite-type ScVO 3. The new perovskite has orthorhombic symmetry at room temperature, space group Pnma, and lattice parameters a = 5.4006(2) Å, b = 7.5011(2) Å, and c = 5.0706(1) Å with Sc 3+ and V 3+ ions fully ordered on the A and B sites of the perovskite cell. The vanadium oxygen octahedra [V-O 6] display cooperative Jahn-Teller (JT) type distortions, with predominance of the tetragonal Q 3 over the orthorhombic Q 2 JT modes. The orthorhombic perovskite shows Arrhenius-type electrical conductivity and undergoes a transition to triclinic symmetry space group P-1 close to 90 K. Below 60 K, the magnetic moments of the 4 nonequivalent vanadium ions undergo magnetic long-range ordering, resulting in a magnetic superstructure of the perovskite cell with propagation vector (0.5, 0, 0.5). The magnetic moments are confined to the xz plane and establish a close to zigzag antiferromagnetic mode. © 2011 American Chemical Society. |
| Databáze: | OpenAIRE |
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