RE 3Mo14O30 and RE 2Mo9O19, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures (RE = La-Pr)

Scott Forbes; Tai Kong; Robert J. Cava

doi:10.1021/acs.inorgchem.7b03197

RE ₃Mo₁₄O₃₀ and RE ₂Mo₉O₁₉, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures (RE = La-Pr)

Scott Forbes, Tai Kong, Robert J. Cava

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

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 P1 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 RE₂Mo₉O₁₉ phases to be simple paramagnets, while La₃Mo₁₄O₃₀ was observed to order antiferromagnetically at 18 K. Electrical resistivity measurements confirmed all of the samples to behave as nondegenerate semiconductors.

Original language	English (US)
Pages (from-to)	3873-3882
Number of pages	10
Journal	Inorganic Chemistry
Volume	57
Issue number	7
DOIs	https://doi.org/10.1021/acs.inorgchem.7b03197
State	Published - Apr 2 2018

All Science Journal Classification (ASJC) codes

Inorganic Chemistry
Physical and Theoretical Chemistry

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10.1021/acs.inorgchem.7b03197

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title = "RE 3Mo14O30 and RE 2Mo9O19, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures (RE = La-Pr)",

abstract = "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 P1 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 RE2Mo9O19 phases to be simple paramagnets, while La3Mo14O30 was observed to order antiferromagnetically at 18 K. Electrical resistivity measurements confirmed all of the samples to behave as nondegenerate semiconductors.",

author = "Scott Forbes and Tai Kong and Cava, {Robert J.}",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

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doi = "10.1021/acs.inorgchem.7b03197",

language = "English (US)",

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T1 - RE 3Mo14O30 and RE 2Mo9O19, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures (RE = La-Pr)

AU - Forbes, Scott

AU - Kong, Tai

AU - Cava, Robert J.

PY - 2018/4/2

Y1 - 2018/4/2

N2 - 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 P1 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 RE2Mo9O19 phases to be simple paramagnets, while La3Mo14O30 was observed to order antiferromagnetically at 18 K. Electrical resistivity measurements confirmed all of the samples to behave as nondegenerate semiconductors.

AB - 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 P1 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 RE2Mo9O19 phases to be simple paramagnets, while La3Mo14O30 was observed to order antiferromagnetically at 18 K. Electrical resistivity measurements confirmed all of the samples to behave as nondegenerate semiconductors.

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VL - 57

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JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 7

ER -

RE ₃Mo₁₄O₃₀ and RE ₂Mo₉O₁₉, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures (RE = La-Pr)

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