Abstract
La3Cu2VO9 crystallizes in a heretofore unknown superstructural variation of the rare-earth hexagonal structure (P63/mmc) for ABO3 stoichiometries as characterized by X-ray, neutron and electron diffraction. The alternating hexagonal layers of LaO6/3 and (Cu/V)O3/3 resemble those of YA1O3, except that the copper and vanadium order to create an a√13 × a√13 × c supercell with P63/m symmetry. The B-cation coordination environments accommodate copper and vanadium in a two to one molar ratio. The CuII lattice consists of nine atom clusters of triangles in triangles similar to a kagomé lattice. The phase is paramagnetic from 5 to 370 K with three temperature regimes that correspond closely to 1/9, 4/9, and 9/9 spins per copper.
Original language | English (US) |
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Pages (from-to) | 569-579 |
Number of pages | 11 |
Journal | Solid State Sciences |
Volume | 3 |
Issue number | 5 |
DOIs | |
State | Published - 2001 |
Funding
This work is supported by a National Science Foundation (NSF) graduate fellowship for DAVG, and made use of the Central Facilities at the Materials Research Center of Northwestern University (NSF DMR-9632472). S.J.B. and N.M.D. participated in the 1999 MASEC Summer Research Program for undergraduates at the Materials Research Center Northwestern University (NSF DMR-9632472). We would like to thank Dr. James Jorgensen and Dr. Simine Short for carrying out the neutron diffraction experiment. The IPNS is supported by the Department of Energy (W-31-109-ENG-38).
Keywords
- Copper clusters
- Hexagonal structure
- Kagomé
- LaCuVO
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics