RE3Mo14O30 and RE2Mo 9O19, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures (RE = La–Pr)
- Princeton Univ., NJ (United States). Dept. of Chemistry
The previously unreported RE3Mo14O30 and RE2Mo9O19 phases were synthesized in vacuo from rare-earth oxides, molybdenum oxide, and molybdenum metal using halide fluxes at 875-1000 °C. Both phases adopt structures in the triclinic $$P\overline1$$ space group albeit with several notable differences. The structures display an ordering of layers along the a direction of the unit cell, forming distinct honeycomb-related lattice arrangements composed of MoO6 octahedra and vacancies. Mo-Mo bonding and clusters are present; the RE3Mo14O30 structure contains Mo dimers and rhomboid tetramers, while the RE2Mo9O19 structure contains rhomboid tetramers and an unusual arrangement of planar tetramers, pentamers, and hexamers. The magnetic measurements found the RE2Mo9O19phases to be simple paramagnets, while La3Mo14O30 was observed to order antiferromagnetically at 18 K. Finally, electrical resistivity measurements confirmed all of the samples to behave as nondegenerate semiconductors.
- Research Organization:
- Princeton Univ., NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-98ER45706
- OSTI ID:
- 1595087
- Journal Information:
- Inorganic Chemistry, Vol. 57, Issue 7; ISSN 0020-1669
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
HYDROTHERMAL SYNTHESIS OF RED PHOSPHOR La 2 (MoO 4 ) 3 DOPED WITH Eu3+ AND ITS APPLICATION FOR FERRIC IONS ASSAY
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journal | September 2019 |
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