Einlagerungsphasen vom TypMe x[Ta2S2C]

Boller, H.; Sobczak, R.

doi:10.1007/bf00917176

Cited by 23 publications

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“…Here, we recall that Ta 2 CS 2 has two polymorphs with different stacking sequences, the 3R-type ( R –3 m ) being isostructural with Ti 2 PTe 2 and the 1T-type ( P –3 m 1), as displayed in Fig. 1a,b, respectively33. Both forms of Ta 2 CS 2 are capable of accepting various foreign cations, but since the stacking sequences are different, intercalated cations find themselves in different coordination environments.…”

Section: Resultsmentioning

confidence: 92%

“…Both forms of Ta 2 CS 2 are capable of accepting various foreign cations, but since the stacking sequences are different, intercalated cations find themselves in different coordination environments. For example, Fe and Co in 3R- M x Ta 2 CS 2 ( M =Fe, Co) partially occupy octahedral voids (site 6 c ), whereas Cu in 1T- M x Ta 2 CS 2 occupies tetrahedral voids (site 2 d )333435, as illustrated in Supplementary Fig. 7.…”

Section: Resultsmentioning

confidence: 97%

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Selective and low temperature transition metal intercalation in layered tellurides

et al. 2016

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Layered materials embrace rich intercalation reactions to accommodate high concentrations of foreign species within their structures, and find many applications spanning from energy storage, ion exchange to secondary batteries. Light alkali metals are generally most easily intercalated due to their light mass, high charge/volume ratio and in many cases strong reducing properties. An evolving area of materials chemistry, however, is to capture metals selectively, which is of technological and environmental significance but rather unexplored. Here we show that the layered telluride T2PTe2 (T=Ti, Zr) displays exclusive insertion of transition metals (for example, Cd, Zn) as opposed to alkali cations, with tetrahedral coordination preference to tellurium. Interestingly, the intercalation reactions proceed in solid state and at surprisingly low temperatures (for example, 80 °C for cadmium in Ti2PTe2). The current method of controlling selectivity provides opportunities in the search for new materials for various applications that used to be possible only in a liquid.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Selective and low temperature transition metal intercalation in layered tellurides

et al. 2016

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“…Zr 0.29 Zr 2 Te 2 As. A single-crystal structure determination revealed that Zr 0.29 Zr 2 Te 2 As (Figure ) is isostructural with 3R-M x Ta 2 S 2 C, (M = Ti−Ni), a layered material built up with close packed hexagonal layers of anions. Individual slabs in Zr 0.29 Zr 2 Te 2 As display a [Te−Zr−As−Zr−Te] stacking sequence.…”

Section: Resultsmentioning

confidence: 99%

New Layered Zirconium Tellurides: Zr_0.30ZrTe₂, Zr_0.29Zr₂Te₂As, and NaZr₂Te₂As

1998

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The synthesis and crystal structure determinations of Zr(0.30)ZrTe(2) and M(x)Zr(2)Te(2)As (M = Zr, Na) compounds are reported. The structure of Zr(0.30)ZrTe(2) was refined in the hexagonal space group P6(3)mc (No. 186, Z = 2) with lattice parameters a = 3.9840(3) Å and c = 13.366(3) Å; Zr(0.29)Zr(2)Te(2)As was refined in the rhombohedral space group R&thremacr;m (No. 166, Z = 3) with lattice parameters a = 3.9329(4) Å and c = 29.564(5) Å. Zr(0.30)ZrTe(2) and Zr(0.29)Zr(2)Te(2)As have close structural similarities to Zr(2)Se(3) and Ta(2)S(2)C, respectively, and are built up by stacking hexagonal layers with [Zr(0.30)-Te-Zr-Te] and [Zr(0.29)-Te-Zr-As-Zr-Te] sequences. Four-probe resistivity measurements (77-300 K) show both Zr(0.30)ZrTe(2) and Zr(0.29)Zr(2)Te(2)As to be metallic (Zr(0.29)Zr(2)Te(2)As: 8.9 x 10(-)(5) Omega cm at 273 K). Both compounds exhibit structures wherein Zr atoms are included between layers (ZrTe(2) and Zr(2)Te(2)As) by partially filling trigonal antiprismatic holes. The replacement of the included Zr ions in Zr(0.29)Zr(2)Te(2)As by Na ions has been demonstrated. Powder diffraction data showed that NaZr(2)Te(2)As is isostructural with Zr(0.29)Zr(2)Te(2)As. By use of Rietveld refinements, sodium ions were found to reside in the trigonal antiprismatic sites between the layers. Extended Hückel band calculations on the [Zr(2)Te(2)As](1.16)(-) layer indicate that it should be a metallic conductor and that the [Zr(2)Te(2)As] layer can bear a greater negative charge than has so far been observed. We suggest that the [Zr(2)Te(2)As] layered compounds may offer new opportunities as electron-donating hosts.

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