Cs2Cr4O13: a new structure type among alkali tetrachromates

Kolitsch, Uwe

doi:10.1107/s0108270103029068

Cited by 8 publications

(24 citation statements)

References 6 publications

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“…This novel structure type is closely related to that of monoclinic KAlP 2 O 7 (spacegroup P2 1 /c) [12], which is also adopted by (NH 4 )ScAs 2 O 7 [14], RbScAs 2 O 7 [13], and at least 27 more diphosphates, see [13] Fig. 2b) look very similar.…”

Section: Comparison To Related Structure Typesmentioning

confidence: 76%

“…A fifth structure type (C2) with LiFeAs 2 O 7 [10] and LiGaAs 2 O 7 [6] as members, is also adopted by the mineral gittinsite, CaZrSi 2 O 7 [11], a fact that has been overlooked in the first description [10]. The common KAlP 2 O 7 -type [12] (P2 1 /c) also has some recently discovered representatives among arsenates, namely RbScAs 2 O 7 [13], (NH 4 )ScAs 2 O 7 [14], and TlScAs 2 O 7 [6].…”

Section: Introductionmentioning

confidence: 99%

“…This contribution is part of a comprehensive study of the synthesis, crystallography, and properties of arsenate (V) compounds in the system M 1+ -M 3+ -As-O-H (M 1+ = Li, Na, K, Rb, Cs, Tl, Ag, NH 4 ; M 3+ = B, Al, Ga, In, Sc, Cr, Fe) [6,[13][14][15][16][17][18][19]. The present paper reports the hydrothermal synthesis and crystal structure determination of three new, isotypic In-diarsenates of monovalent cations, and demonstrates that more novel structure types are still being found among arsenates.…”

Section: Introductionmentioning

confidence: 99%

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TlInAs2O7, RbInAs2O7, and (NH4)InAs2O7: Synthesis and crystal structures of three isotypic microporous diarsenates – representatives of a novel structure type

Schwendtner

2006

Journal of Alloys and Compounds

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Section: Comparison To Related Structure Typesmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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TlInAs2O7, RbInAs2O7, and (NH4)InAs2O7: Synthesis and crystal structures of three isotypic microporous diarsenates – representatives of a novel structure type

Schwendtner

2006

Journal of Alloys and Compounds

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“…-As-O-(H) by hydrothermal syntheses, a large variety of new compounds and structure types were found (Kolitsch, 2004;Schwendtner, 2006;Schwendtner & Kolitsch, 2004a,b, 2005,b,c,d, 2017a. KInAs 2 O 7 is another example of a microporous metal diarsenate compound forming a tetrahedral-octahedral framework structure.…”

Section: +mentioning

confidence: 99%

“…The intermediate-sized M + cations Ag + and Na + generally form either of two structure types, the NaInAs 2 O 7 type (Belam et al, 1997) or the NaAlAs 2 O 7 type (Driss & Jouini, 1994). While the former is only known from the comparatively large M 3+ cation In 3+ (Belam et al, 1997, ICDD-PDF 059-0058;Wohlschlaeger et al, 2007), the latter is adopted by the smaller M 3+ representatives (M = Al, Fe, Ga) (Ouerfelli et al, 2004;Schwendtner & Kolitsch, 2017b (Boughzala & Jouini, 1992Bouhassine & Boughzala, 2017;Lin & Lii, 1996;Siegfried et al, 2004;Ouerfelli et al, 2007a), the KAlP 2 O 7 type (Ng & Calvo, 1973), which is extremely common among M + M 3+ P 2 O 7 compounds, is favoured by the somewhat larger Sc 3+ cation (Baran et al, 2006;Kolitsch, 2004;Schwendtner & Kolitsch, 2004a) and the CsCr member CsCrAs 2 O 7 (Bouhassine & Boughzala, 2015). The third type, TlInAs 2 O 7 , is very closely related to the two former types and favoured by the large In 3+ cation (Schwendtner, 2006), with also one Fe member (KFeAs 2 O 7 ; Ouerfelli et al, 2007b).…”

Section: +mentioning

confidence: 99%

KInAs₂O₇, a new diarsenate with the TlInAs₂O₇structure type

Schwendtner

Kolitsch

2017

Acta Cryst E

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Potassium indium diarsenate(V) was grown under mild hydrothermal conditions (T = 493 K, 7 d) at a pH value of about 1. It adopts the TlInAs 2 O 7 structure type (P1, Z = 4) and is closely related to the KAlP 2 O 7 (P2 1 /c) and RbAlAs 2 O 7 (P1) structure types. The framework topology of KInAs 2 O 7 is built of two symmetrically non-equivalent As 2 O 7 groups which share corners with InO 6 octahedra. The K atoms are located in channels extending along [010]. Chemical contextMetal arsenates often form tetrahedral-octahedral framework structures exhibiting potentially interesting properties, such as ion conductivity, ion exchange and catalytic properties (Masquelier et al., 1990(Masquelier et al., , 1994a(Masquelier et al., ,b, 1995(Masquelier et al., , 1996(Masquelier et al., , 1998Mesa et al., 2000;Ouerfelli et al., 2007aOuerfelli et al., , 2008Pintard-Scré pel et al., 1983;Rousse et al., 2013). During a detailed study of the system M + -M 3+-As-O-(H) by hydrothermal syntheses, a large variety of new compounds and structure types were found (Kolitsch, 2004;Schwendtner, 2006;Schwendtner & Kolitsch, 2004a,b, 2005,b,c,d, 2017a. KInAs 2 O 7 is another example of a microporous metal diarsenate compound forming a tetrahedral-octahedral framework structure. M + M 3+ As 2 O 7 compounds crystallize in six known structure types (for a short review, see: Schwendtner & Kolitsch, 2017b), some of these diarsenates being also isotypic to diphosphates or disilicates. For several of the structures, the M + cation is the relevant factor that determines which structure type is adopted, while a wide range of different M 3+ cations are usually accepted. For example, the CaZrSi 2 O 7 structure type (mineral gittinsite; Roelofsen-Ahl & Peterson, 1989) is formed by all Li members (and one Na member), with M 3+ cations ranging from M = Al, Ga, Fe to Sc (Schwendtner & Kolitsch, 2007d;Wang et al., 1994 Table 1).The asymmetric unit contains 22 atoms, all of which lie on general positions. Each InO 6 octahedron shares corners with five different AsO 4 tetrahedra, thus creating a framework structure. Two of these connections are to two AsO 4 tetrahedra of the same As 2 O 7 group (see Fig. 1). The K + cations are situated in small channels extending along [010] (see Fig. 2) and have irregular coordination spheres, with ten (K1) and seven (K2) O atoms within 3.5 Å .The AsO 4 tetrahedra are strongly distorted, with bondlength distortion (Brown & Shannon, 1973) ranging from 0.0020 to 0.0024, while the average As-O distances (1.685, 1.687, 1.689 and 1.690 Å for As1-4, respectively, see Table 1 Comparison of the unit-cell parameters of diarsenates isotypic with KInAs 2 O 7 and closely related structure types. (2015); (7) Kolitsch (2004); (8) Figure 1The principal building unit of KInAs 2 O 7 , shown as displacement ellipsoids at the 70% probability level. The In1O 6 octahedron is considerably more distorted than the In2-centred octahedron. In fact, the In1O 6 octahedron shows the strongest distortion among all of the isotypic In compounds (S...

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