Synthesis, Crystal Structure, and Electrical and Magnetic Characterizations of the Monoclinic Compounds LnMoSiO (Ln = La, Ce, Pr, and Nd; = 0 and 0.35) Containing Mo Clusters and Mo Dimers.

Powder samples of the new monoclinic compounds LnMoSiO (Ln = La, Ce, Pr, and Nd) and single crystals of PrMoSiO were obtained by the solid-state reaction. The crystal structure of PrMoSiO was determined by single-crystal X-ray diffraction. PrMoSiO crystallizes in the monoclinic space group 2/ with unit-cell parameters = 5.

LiMoO: Polar Crystal Structure with Infinite Edge-Sharing Molybdenum Octahedra.

Polycrystalline LiMoO was prepared in a sealed Mo crucible at 1380 °C for 48 h using the conventional high-temperature solid-state method. The polar tetragonal crystal structure (space group 4) is confirmed based on the Rietveld refinement of powder neutron diffraction and Li/Li solid-state NMR. The crystal structure features infinite chains of MoO (i.

Synthesis, Crystal and Electronic Structures, and Electrical Properties of the Fifth Member of the Rb(MoS)(MoS) Series: RbMoS, an Atypical Reduced Molybdenum Sulfide Containing Mo and Mo Clusters.

The new compound RbMoS has been synthesized as single crystals by a solid-state reaction in a sealed molybdenum crucible at 1500 °C. It constitutes the fifth member of the homologous series of the trigonal (space group 3̅) compounds Rb(MoS)(MoS). Consequently, its crystal structure is based on an equal mixture of MoS and MoS cluster units interlinked through Mo-S bonds with the Rb cations localized in the voids between the MoS and MoS units.

Electronic Band Structure and Transport Properties of the Cluster Compound AgTlMoSe.

Mo-based cluster compounds are a large class of materials with complex crystal structures that give rise to very low lattice thermal conductivity. Here, we report on the crystal structure and transport property measurements (5-800 K) of the novel Tl-filled compound AgTlMoSe. This compound adopts a crystal structure described in the rhombohedral R3 c space group [ a = 9.

Synthesis, Crystal Structure, and Transport Properties of the Hexagonal Mo Cluster Compound AgRbMoSe.

Mo-based cluster compounds are promising candidates for thermoelectric applications at high temperatures due to their very low lattice thermal conductivity values. Here, we report on a detailed investigation of the crystal structure and transport properties measured in a wide range of temperatures (2-800 K) of polycrystalline AgRbMoSe. Single-crystal X-ray diffraction shows that this compound crystallizes in the hexagonal space group P6/m.

Synthesis, Structure, and Electrical Properties of the Mo Cluster Sulfide HgKMoS Containing Mercury Chains.

The new compound HgKMoS was synthesized by diffusing mercury into the metastable KMoS compound at 350 °C. Its crystallographic structure, solved from single-crystal X-ray diffraction, shows that the Mo-S framework is maintained during the synthesis. It is based on MoSS units interlinked via Mo-S bonds as in the parent compound.

Li2GeMo3O8: a novel reduced molybdenum oxide containing Mo3O13 cluster units.

The crystal structure of the title compound, dilithium germanium trimolybdenum octa-oxide, consists of distorted hexa-gonal-close-packed oxygen layers with stacking sequence ABAC along [001] that are held together by alternating lithium-germanium and molybdenum layers. The two Li(+) and Ge(4+) ions all have site symmetry 3m. and occupy, respectively, tetra-hedral and octa-hedral sites in the ratio 2:1.

Cu Insertion Into the Mo12 Cluster Compound Cs2Mo12Se14: Synthesis, Crystal and Electronic Structures, and Physical Properties.

Mo-based cluster compounds are promising materials for high-temperature thermoelectric applications due to their intrinsic, extremely low thermal conductivity values. In this study, polycrystalline cluster compounds Cs2CuxMo12Se14 were prepared for a wide range of Cu contents (0 ≤ x ≤ 2). All samples crystallize isostructurally in the trigonal space group R3̅.

Reentrant Phase Coherence in Superconducting Nanowire Composites.

The short coherence lengths characteristic of low-dimensional superconductors are associated with usefully high critical fields or temperatures. Unfortunately, such materials are often sensitive to disorder and suffer from phase fluctuations in the superconducting order parameter which diverge with temperature T, magnetic field H, or current I. We propose an approach to overcome synthesis and fluctuation problems: building superconductors from inhomogeneous composites of nanofilaments.

Crystal structure of Sc1.91In1.39Mo15Se19, containing Mo6 and Mo9 clusters.

The structure of scandium indium penta-deca-molybdenum nona-deca-selenide, Sc1.91In1.39Mo15Se19, is isotypic with In2.

X-ray characterization, electronic band structure, and thermoelectric properties of the cluster compound Ag2Tl2Mo9Se11.

We report on a detailed investigation of the crystal and electronic band structures and of the transport and thermodynamic properties of the Mo-based cluster compound Ag2Tl2Mo9Se11. This novel structure type crystallizes in the trigonal space group R3̅c and is built of a three-dimensional network of interconnected Mo9Se11 units. Single-crystal X-ray diffraction indicates that the Ag and Tl atoms are distributed in the voids of the cluster framework, both of which show unusually large anisotropic thermal ellipsoids indicative of strong local disorder.

Na3.88Mo15Se19: a novel ternary reduced molybdenum selenide containing Mo6 and Mo9 clusters.

The structure of tetrasodium penta-deca-molybdenum nona-deca-selenide, Na3.88Mo15Se19, is isotypic with the In3+x Mo15Se19 compounds [Grüttner et al. (1979 ▶).

Na2.9KMo12S14: a novel quaternary reduced molybdenum sulfide containing Mo12 clusters with a channel structure.

The crystal structure of tris-odium potassium dodeca-molybdenum tetra-deca-sulfide, Na2.9 (2)KMo12S14, consists of Mo12S14S6 cluster units inter-connected through inter-unit Mo-S bonds and delimiting channels in which the Na(+) cations are disordered. The cluster units are centered at Wyckoff positions 2d and have point-group symmetry 3.

The pyrochlore-type molybdate Pr2Mo1.73Sc0.27O7.

Dipraseodymium molybdenum scandium hepta-oxide, Pr2Mo1.73Sc0.27O7, crystallizes in the cubic pyrochlore-type structure.

Sc(0.43(2))Rb2Mo15S19, a partially Sc-filled variant of Rb2Mo15S19.

The structure of scandium dirubidium pentadecamolybdenum nonadecasulfide, Sc(0.43(2))Rb(2)Mo(15)S(19), constitutes a partially Sc-filled variant of Rb(2)Mo(15)S(19) [Picard, Saillard, Gougeon, Noel & Potel (2000), J. Solid State Chem.

LiCe(9)Mo(16)O(35).

The structure of lithium nona-cerium hexa-deca-molybdenum penta-trideca-oxide, LiCe(9)Mo(16)O(35), is isotypic with LiNd(9)Mo(16)O(35) [Gougeon Gall, Cuny, Gautier, Le Polles, Delevoye & Trebosc (2011 ▶). Chem. Eur.

Synthesis, crystal and electronic structures, and magnetic properties of LiLn9Mo16O35 (Ln = La, Ce, Pr, and Nd) compounds containing the original cluster Mo16O36.

The new compounds LiLn(9)Mo(16)O(35) (Ln=La, Ce, Pr, and Nd) were synthesized from stoichiometric mixtures of Li(2)MoO(4), Ln(2)O(3), Pr(6)O(11) or CeO(2), MoO(3), and Mo heated at 1600 °C for 48 h in a molybdenum crucible sealed under a low argon pressure. The crystal structure, determined from a single crystal of the Nd member, showed that the main building block is the Mo(16)O(36) unit, the Mo(16) core of which is totally new and results from the fusion of two bioctahedral Mo(10) clusters. It can also be viewed as a fragment of an infinite twin chain of edge-sharing Mo(6) octahedra.

Pr(16)Mo(21)O(56).

The structure of hexa-deca-praseodymium henicosa-molybden-um hexa-penta-contaoxide, Pr(16)Mo(21)O(56), is isotypic with other rare earth representatives of formula type RE(16)Mo(21)O(56) (RE = La, Ce, Nd). It is characterized by Mo(10)O(18) (i)O(8) (a) units (where i = inner and a = apical O atoms) containing biocta-hedral Mo(10) clusters and octa-hedral MoO(6) units that share some of their O atoms to form the Mo-O framework. The two independent Mo(10) cluster units are centred at Wyckoff positions 2b and 2c and have point-group symmetry [Formula: see text].

Tl(2)Mo(9)Se(11).

The structure of Tl(2)Mo(9)Se(11), dithallium nona-molybdenum undeca-selenide, is isotypic with Tl(2)Mo(9)S(11) [Potel et al. (1980 ▶). Acta Cryst.

V(1.42)in(1.83)mo(15)se(19).

The structure of the title compound, vanadium indium penta-deca-molybdenum nona-deca-selenide, V(1.42)In(1.83)Mo(15)Se(19), is isotypic with In(2.

Synthesis, electronic and crystal structures, and physical studies of the superconductor Cs(~1)Mo12S14, final step of the condensation of the Mo6L8(i)L6(a) unit.

The ternary reduced molybdenum sulphide Cs(~1)Mo12S14 has been synthesized by solid-state reaction at 1400 degrees C for 96 h in sealed molybdenum crucibles. The compound crystallizes in the trigonal space group P31c with the following lattice parameters: a = 9.9793 (2) A, c = 6.

The Chevrel phase HgMo(6)S(8).

The crystal structure of HgMo(6)S(8), mercury(II) hexa-molybdenum octa-sulfide, is based on (Mo(6)S(8))S(6) cluster units ( symmetry) inter-connected through inter-unit Mo-S bonds. The Hg(2+) cations occupy large voids between the different cluster units and are covalently bonded to two S atoms. The Hg atoms and one S atom lie on sites with crystallographic and 3 symmetry, respectively.

Redetermination of zn(2)mo(3)o(8).

The crystal structure of dizinc trimolybdenum(IV) octa-oxide, Zn(2)Mo(3)O(8), has been redetermined from single-crystal X-ray data. The structure has been reported previously based on neutron powder diffraction data [Hibble et al. (1999 ▶).

Mo(15)S(20): first evidence of a new molybdenum cluster type in a metastable solid-state compound.

The Mo(15)S(20) compound was obtained by thermal decomposition of the metastable binary Mo(15)S(19) in sealed silica tube at temperatures above 500 degrees C. Its crystal structure was solved and refined from a two-component composite crystal by X-ray diffraction in the hexagonal space group P6(3)/m and consists of an equal mixture of the original Mo(9)S(27) cluster unit and the classical one Mo(6)S(8)S(6) interconnected through Mo--S bonds. The Mo core of the Mo(9)S(27) unit is totally new and formed a tricapped trigonal prism.

Synthesis, structural evolution, and electrical properties of the novel Mo12 cluster compounds K(1+x)Mo12S14 (x = 0, 1.1, 1.3, and 1.6) with a tunnel structure.

The new structural type (1) K(2.3)Mo12S14 was prepared by solid-state reaction at 1500 degrees C in a sealed molybdenum crucible. The compound crystallizes in the trigonal space group P1c, Z = 2, (1) a = 9.