Caesium Gadolinium Tetratelluride

Abstract

cations are in the same square-antiprismatic environment of Te as the Gd cations. The Cs--Te distance of 3.9112 (5) ,~ is in good agreement with the values o reported for CsTe4 (<CsmTe> = 3.954A; B6ttcher & Kretschmann, 1982), Cs2Te5 (<Csl--Te> --3.929, (Received 18 June 1996; accepted 3 October 1996) Gd Te AbstractThe new ternary gadolinium telluride CsGdTe4 was prepared via the molten flux method. It is a layer compound containing Te~-tellurium dianions. Layers of Gd centres are sandwiched by Te layers leading to [GdTe4] n-layers which are separated by Cs cations. Within a [GdTen]n n-layer, the Gd cations are in a square-antiprismatic coordination of eight Te anions. CommentIn the alkali metal-lanthanoid-chalcogenide system, beside the two structure types of composition ALnQ2 crystallizing in the simple NaCl-type structure with statistically distributed A ÷ and Ln 3+ cations or the a-NaFeO2 structure type, a number of new structure types for ternary and quaternary alkali metallanthanoid-chalcogenide compounds have been prepared recently using the polychalcogenide flux method.

Ag10Te4Br3: A New Silver(I) (poly)Chalcogenide Halide Solid Electrolyte

“…[Te 2 ] 2- dumbbells (Te2) center half of the hexagonal tellurium rings (Te3 and Te4, d (Te3−Te4) from 4.204(1) to 5.400(1) Å) of the 6 3 nets (see Figure ). A bond distance of 2.803(1) Å is typical for a single bond, slightly shorter than in elemental tellurium and comparable with a 2.79 Å average distance of [Te 2 ] 2- dumbbells reported in the literature. − The zigzaglike ordering principle of the tellurium dumbbells relative to the 6 3 net along the c axis can be easily derived from Figure . The [Te 2 ] 2- dumbbells are neighbored by additional tellurium positions ( d (Te1−Te2) = 3.599(1) Å).…”

Diverse Closed Cavities in Condensed Rare Earth Metal–Chalcogenide Matrixes: Cs[Lu7Q11] and (ClCs6)[RE21Q34] (RE = Dy, Ho; Q = S, Se, Te)

“…Ternary alkali metal/rare earth metal/chalcogenide compounds (A/RE/Q, Q = S, Se, Te) are fascinating for their complexity and beauty. Up until now, eight types of structures are known and are listed according to their A/RE/Q stoichiometries as following, 1:1:2 (including about 40 compounds, e.g., RbLaSe 2 ), − 3:7:12 (adopted by roughly 10 compounds, e.g., Rb 3 Yb 7 Se 12 ), − 1:3:5 (only 2 examples of CsEr 3 Se 5 and CsHo 3 Te 5 ), 3:11:18 (only found in Cs 3 Tm 11 Te 18 ), 1:5:8 (RbSc 5 Te 8 ), 2:24:36 (as found in a Tm fractional occupied example, K 2 Tm 23.33 S 36 ), 1:1:4 (including 12 compounds, e.g., KCeSe 4 ), − and 1:3:8 (including 4 compounds, e.g., KPr 3 Te 8 ). ,, Note that 1:1:4 and 1:3:8 types of compounds possess Q–Q bonding interactions and are thus excluded from the structure discussion below. Another exception is K 2 Tm 23.33 S 33 in which two types of building units are found as TmS 6 and TmS 7 .…”

The coloring problem in Ba2Cu3VS6 †

“…Our conclusion was that the most stable structures are those that maximize the number of Cu ؒ ؒ ؒ V contacts. Although a variety of d 10 -d 0 combinations can be found in molecular 7-10 or extended structures, [11][12][13][14][15][16][17][18][19] we have focused our study on the extended structures of ternary copper() thiovanadates. One of the most interesting cases is that of Ba 2 Cu 3 VS 6 , a compound that adopts a double chain structure 12 (Fig.…”