Synthesis, crystal structure and properties of K2Ta2S10: A novel ternary tantalum polysulfide with TaS8 polyhedra forming infinite anionic chains

Wu, Yuandong; Näther, Christian; Bensch, Wolfgang

doi:10.1016/j.jssc.2005.02.010

Cited by 9 publications

(6 citation statements)

References 29 publications

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“…In addition, the Q x 2À chains can act as ligands or bridging anions as found in A 6 Nb 4 S 22 (A ¼ Rb, Cs), 9 K 6 Nb 4 S 25 , 10 K 4 Nb 2 S 11 , 11 K 4 Nb 2 S 14 , 12 Rb 12 Nb 6 Se 35 , 13 NaNbS 6 , 14 and K 2 Ta 2 S 10 . 15 In general the oxidized metal cations are in their highest oxidation state achievable for a given metal element. During the reaction with temperatures up to 600 C no versatile species are formed preventing explosions of glass or silica ampoules.…”

Section: Wolfgang Benschmentioning

confidence: 99%

Structural diversity of rare earth and transition metal thiophosphates

Bensch

2010

CrystEngComm

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Technological interest in the design of solid state materials has stimulated recent research into the development of mild molten polychalcophosphate salt fluxes for the synthesis of complex, multinary rare earth and transition metal thiophosphate compounds. The reaction pathways from elemental or metal sulfide sources can be influenced by a variety of often interdependent factors of which counter cation sizes and charges, basicity, and temperature are of paramount importance. In rare earth and transition metal containing thiophosphates the dominating structural building units are tetrahedral [PS 4 ] 3À or ethane-like [P 2 S 6 ] 4À anions. Hierarchical topological relations between individual members of structural families of the type A m M n P y S z (A ¼ alkali metal, M ¼ rare earth or transition metal) can be established that provide a detailed insight into probable mechanisms of formation. The findings enable the development of guidelines for the employment of suitable counter cations in controlling the condensation of small species into chains, layers or frameworks.

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Section: Wolfgang Benschmentioning

confidence: 99%

Structural diversity of rare earth and transition metal thiophosphates

Bensch

2010

CrystEngComm

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“…27 Such tetrahedra also occur in the quaternary phases RbBaTaS 4 28 and LiRb 2 TaS 4 , 29 and in Cu-and Agsubstituted compounds like K 3 Cu 3 Ta 2 S 8 , 30 39 and the TaS 8 distorted bicapped trigonal prism in K 2 Ta 2 Ta 10 . 40 Here, we report on the first ternary sodium phosphidotantalate, Na 7 TaP 4 . After the first serendipitous isolation of single crystals of Na 7 TaP 4 from a reaction of the elements with a formal stoichiometry "Na 3 Al 3 P 4 " in tantalum ampules, we subsequently developed an efficient ball milling synthesis starting from the elements.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Such tetrahedra also occur in the quaternary phases RbBaTaS 4 and LiRb 2 TaS 4 , and in Cu- and Ag-substituted compounds like K 3 Cu 3 Ta 2 S 8 , K 2 AgTaS 4 , K 3 Ag 3 Ta 2 S 8 , Rb 2 CuTaS 4 , Rb 2 AgTaS 4 , and Cs 2 AgTaS 4 . Furthermore, numerous polysulfides were reported by Bensch et al, which cover many phases with different Ta x S y polyhedra: [Ta 2 S 11 ] 4– polyhedra in K 4 Ta 2 S 11 , Rb 4 Ta 2 S 11 , Cs 4 Ta 2 S 11 , and K 2 BaTa 2 S 11 ; [Ta 4 S 22 ] 6– polyhedra in K 6 Ta 4 S 22 , Rb 6 Ta 4 S 22 , and Cs 6 Ta 4 S 22 ; and [Ta 4 S 25 ] 6– polyhedra in Rb 6 Ta 4 S 25 and the TaS 8 distorted bicapped trigonal prism in K 2 Ta 2 Ta 10 …”

Section: Introductionmentioning

confidence: 99%

Na₇TaP₄: A Ternary Sodium Phosphidotantalate Containing [TaP₄]^7– Tetrahedra

et al. 2020

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While lithium phosphides have been investigated intensively, very little is known about the corresponding sodium-based phosphides. Here, we report on the first ternary Na–Ta–P compound Na7TaP4, which is easily accessible via ball milling of the elements and subsequent annealing. The single crystal X-ray structure determination [monoclinic symmetry; space group P21/c; and lattice parameters a = 11.5604(4), b = 8.1530(3), c = 11.5450(5) Å, and β = 101.602(3)°] reveals [TaP4]7– tetrahedra, which are surrounded by Na+ counterions. Na7TaP4 crystallizes in a new structure type. The structure can be described as a strongly distorted hexagonal close packing of P atoms, in which the Ta atoms are located in tetrahedral voids, and Na atoms occupy all octahedral voids and additionally 3/8 of the tetrahedral voids. The possibility to increase the ion conductivity by changing the number of charge carriers through aliovalent substitution in compounds containing [SiP4]8– and [AlP4]9– is considered. The 31P and 23Na MAS NMR as well as the Raman spectra are in accordance with the structure model, and band structure calculations predict a direct band gap of 2.9 eV.

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“…The peaks at 249 and 261 cm −1 are assigned to the polyselenide stretching vibration. The Se 2 −2 vibrations in reported niobium polyselenides range from 215 to 266 cm −1 , depending on the coordinate environment . The weak peak at 218 cm −1 is attributed to the Sb‐Se vibration, comparing favorably to that of K 2 Gd 2 Sb 2 Se 9 …”

Section: Resultsmentioning

confidence: 94%

Synthesis and characterization of new quaternary polyselenide Ba₄TMSbSe₁₂ (TM = Nb, Ta)

Chung

Chen

Lee

2019

J Chinese Chemical Soc

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Two new quaternary polyselenides, Ba4TMSbSe12 (TM = Nb, Ta), are synthesized using a solid state reaction. They crystallize in a new structural type with a P‐1 triclinic space group, characterized according to single‐crystal X‐ray diffraction. The structure is alternately stacked using isolated NbSe95− and SbSe33−, which are separated by Ba2+. The structure contains the NbSe95− unit with a bipentagonal pyramidal shape coordinated with Se2− and Se22− in monodenteate and bidentate modes. The vibrational property of the diselenide Se22− unit was studied using Raman spectrum analysis. ultraviolet–visible diffused reflectance and temperature‐dependent resistivity measurements indicate semiconductor behaviors. Calculations of electronic structures indicate the presence of a band gap and strong Se‐Se interactions in the diselenide group, which experimentally supports the measured physical properties.

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Synthesis, crystal structure and properties of K2Ta2S10: A novel ternary tantalum polysulfide with TaS8 polyhedra forming infinite anionic chains

Cited by 9 publications

References 29 publications

Structural diversity of rare earth and transition metal thiophosphates

Structural diversity of rare earth and transition metal thiophosphates

Na₇TaP₄: A Ternary Sodium Phosphidotantalate Containing [TaP₄]^7– Tetrahedra

Synthesis and characterization of new quaternary polyselenide Ba₄TMSbSe₁₂ (TM = Nb, Ta)

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Synthesis, crystal structure and properties of K2Ta2S10: A novel ternary tantalum polysulfide with TaS8 polyhedra forming infinite anionic chains

Cited by 9 publications

References 29 publications

Structural diversity of rare earth and transition metal thiophosphates

Structural diversity of rare earth and transition metal thiophosphates

Na7TaP4: A Ternary Sodium Phosphidotantalate Containing [TaP4]7– Tetrahedra

Synthesis and characterization of new quaternary polyselenide Ba4TMSbSe12 (TM = Nb, Ta)

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Na₇TaP₄: A Ternary Sodium Phosphidotantalate Containing [TaP₄]^7– Tetrahedra

Synthesis and characterization of new quaternary polyselenide Ba₄TMSbSe₁₂ (TM = Nb, Ta)