Neue Clathrate vom Typ Ge38A8X8 mit A=P, As, Sb und X=Cl, Br, J

Menke, H.

doi:10.1007/bf00623136

Cited by 14 publications

(12 citation statements)

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“…[8] Deviations from the Pm3n space group have been observed for several clathrates. For example, compounds with the general formula [Ge 38 Pn 8 ]X 8 (Pn = P, As, Sb; X = Cl, Br, I) [9][10][11][12] crystallize in the noncentrosymmetric space group P4 3n (No. 218).…”

Section: Introductionmentioning

confidence: 99%

Semiclathrates of the Ge–P–Te System: Synthesis and Crystal Structures

Kirsanova

Reshetova

Olenev

et al. 2011

Chemistry A European J

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Novel compounds [Ge(46-x) P(x) ]Te(y) (13.9≤x≤15.6, 5.92≤y≤7.75) with clathrate-like structures have been prepared and structurally characterized. They crystallize in the space group Fm ̅3 with the unit cell parameter changing from 20.544(2) to 20.698(2) Å (Z=8) on going from x=13.9 to x=15.6. Their crystal structure is composed of a covalently bonded Ge-P framework that hosts tellurium atoms in the guest positions and can be viewed as a peculiar variant of the type I clathrate superstructure. In contrast to the conventional type I clathrates, [Ge(46-x) P(x) ]Te(y) contain tricoordinated (3b) atoms and no vacancies in the framework positions. As a consequence of the transformation of the framework, the majority of the guest tellurium atoms form a single covalent bond with the host framework and thus the title compounds are the first representative of semiclathrates with covalent bonding. A comparison is made with silicon clathrates and the evolution of the crystal structure upon changing the tellurium content is discussed.

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Section: Introductionmentioning

confidence: 99%

Semiclathrates of the Ge–P–Te System: Synthesis and Crystal Structures

Kirsanova

Reshetova

Olenev

et al. 2011

Chemistry A European J

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“…The host framework sub structure reveals no vacancies or positional disorder, so that the crystal structure of the reported compounds is close to the ideal one of clathrate I. However, there is a certain specificity in the distribution of atoms within the framework (Table 5), which has essential differ ences as compared to a group of the already men tioned cationic clathrates [Ge 38 Pn 8 ]X 8 [13][14][15][16]. The latter compounds were found to have a full occupancy of all sites and a complete separation of germanium and pnictogen atoms.…”

Section: Resultsmentioning

confidence: 96%

“…We re vealed no deviations from the space group Pm n, such as superstructure formation or lowering of the symme try, in spite of the fact that the non centrosymmetric space group P n was reported for the related com pounds [Ge 38 Pn 8 ]X 8 (Pn = P, As, Sb; X = Cl, Br, I) [13][14][15][16]. Our attempts to solve the crystal structures in other space groups (e.g.…”

Section: Resultsmentioning

confidence: 96%

“…Besides, there is a smaller family of clathrates with the inverse host guest polarity, where halides or tellurium appear as guest anions in the positively charged framework. For the first time these compounds with the general for mulae [Ge 38 Pn 8 ]X 8 (Pn = P, As, Sb; X = Cl, Br, I) were reported by Menke and von Schnering [13][14][15][16]. They reported all these compounds to crystallize in the non centrosymmetric analog of the group Pm n, the space group P n, which was (in part) questioned later [17].…”

Section: Introductionmentioning

confidence: 86%

“…Given the recent interest into clathrates as potential thermoelectric materials [20,21] and the great influence of the fine structural details on the transport properties of these compounds, we per formed the detailed reinvestigation of the crystal structures of the [Ge 38 Pn 8 ]I 8 family [13][14][15][16] [14,15]. The latter compound was previously unknown.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the crystal structure of the germanium-based cationic clathrates [Ge38.3Sb7.7]I7.44, [Ge38.1P7.9]I8, and [Ge30.5Sn7.7P7.75]I7.88

et al. 2012

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Compounds [Ge 38.3 Sb 7.7 ]I 7.44 , [Ge 38.1 P 7.9 ]I 8 , and [Ge 30.5 Sn 7.7 P 7.75 ]I 7.88 with the clathrate type I structure were synthesized. They crystallize in the cubic space group Pm n with the unit cell parameter a = 10.8592(9), 10.4983(12), and 10.7210(10) Å (Z = 1), respectively. Their crystal structure represents the ger manium(tin) pnictogen framework, capturing the guest iodine anions in its cavities. All compounds have no vacancies in the host substructure; however, two of them show vacancies in the guest positions. The atomic distribution over the framework sites is of the most interest as it follows trends associated with the relative electronegativities of the atoms composing the framework. The results of the band structure calculations and application of the Zintl counting scheme are also discussed in relation to potential thermoelectric properties.

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Phosphides: Solid‐State Chemistry

Pöttgen

Hönle

2005

Encyclopedia of Inorganic Chemistry

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The solid‐state chemistry of phosphides, phosphide oxides, and phosphide halides is reviewed. Phosphorus is outstanding, since no other element approaches phosphorus in the variety of homoatomic connected polyanions formed, as a result of its relatively low electronegativity and stereochemical features. The article covers the various synthesis techniques for solid‐state phosphides, the crystal chemistry, and chemical bonding. Besides the metal‐rich phosphides with pronounced metal–metal bonding, the large family of polyphosphides, which exhibits an unexpected wealth of chemical composition, is discussed. Furthermore, the largely varying magnetic, electronic, and catalytic properties are reviewed.

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Neue Clathrate vom Typ Ge38A8X8 mit A=P, As, Sb und X=Cl, Br, J

Cited by 14 publications

References 1 publication

Semiclathrates of the Ge–P–Te System: Synthesis and Crystal Structures

Semiclathrates of the Ge–P–Te System: Synthesis and Crystal Structures

On the crystal structure of the germanium-based cationic clathrates [Ge38.3Sb7.7]I7.44, [Ge38.1P7.9]I8, and [Ge30.5Sn7.7P7.75]I7.88

Phosphides: Solid‐State Chemistry

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