Novel Compounds Sn10In14P22I8 and Sn14In10P21.2I8 with Clathrate I Structure: Synthesis and Crystal and Electronic Structure

Shatruk, Michael; Kovnir, Kirill; Lindsjö, Martin; Presniakov, Igor A.; Kloo, Lars; Shevelkov, Аndrei V.

doi:10.1006/jssc.2001.9304

Cited by 55 publications

(49 citation statements)

References 18 publications

(17 reference statements)

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“…We thus cannot exclude the possibility where vacancies are distributed in an ordered manner also in these off-stoichiometric type-I clathrate compounds. In fact, a small amount of P vacancies in sites corresponding to the 6c sites of the type-I clathrate structure is recently reported to arrange in an ordered manner in an off-stoichiometric type-I clathrate compound I 8 Sn 14 I 10 P 21.2 so as to form a tetragonal superstructure with the space group of P4 2 / m. 21 As clearly demonstrated in the present study, electron diffraction is powerful to easily observe superlattice reflections arising from an ordered arrangement of vacancies and thus to identify the corresponding superlattice structure.…”

Section: Discussionmentioning

confidence: 98%

Crystal structure and thermoelectric properties of the type-I clathrate compound Ba8Ge43 with an ordered arrangement of Ge vacancies

Okamoto

Nishii

Tanaka

et al. 2006

Journal of Applied Physics

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The crystal structure of the type-I clathrate compound Ba8Ge43 has been investigated by x-ray diffraction and transmission electron microscopy. The thermoelectric properties of Ba8Ge43 have also been investigated. The crystal structure of Ba8Ge43 is different from that reported for the usual type-I clathrate compounds with the space group of Pm3¯n but is a superlattice structure based on the usual type-I clathrate structure due to the ordering of Ge vacancies in half the 6c sites of the usual type-I clathrate structure. The crystal structure of Ba8Ge43 belongs to the space group of Ia3¯d and Ge vacancies exclusively occupy the 24c sites. The thermoelectric properties of Ba8Ge43 are not particularly good, as exemplified by the rather low ZT value of 0.057 because of the high value of electrical resistivity, which may arise from the existence of Ge vacancies.

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Section: Discussionmentioning

confidence: 98%

Crystal structure and thermoelectric properties of the type-I clathrate compound Ba8Ge43 with an ordered arrangement of Ge vacancies

Okamoto

Nishii

Tanaka

et al. 2006

Journal of Applied Physics

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“…A comparison is made with silicon clathrates and the evolution of the crystal structure upon changing the tellurium content is discussed. Keywords: cage compounds · clathrates · germanium · tellurium · Xray diffraction of superstructure is observed in [Sn 14 [18] in which a particular arrangement of vacancies helps to avoid mixed occupancy of the same framework position by tri-and tetracoordinated tin atoms. A third superstructure type is observed for Ba 8 A C H T U N G T R E N N U N G [Cu 16 P 30 ], a rare example of a semiconducting clathrate with a framework that does not contain Group 14 elements.…”

Section: Introductionmentioning

confidence: 98%

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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“…This structural difference adds complexity that may result in added carrier scattering. Shaturk et al 13 showed that the states just below the Fermi level are mainly composed of the orbitals of the 3 + 3 bonded Sn atoms. In addition, cationic Sn-clathrates with 3 + 3 bonded Sn atoms are narrow-gap semiconductors and display relatively high values of r and S, 10 whereas those with only four-bonded tin atoms have much lower electrical conductivities.…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Transport Properties of Sn24P19.3Br8 and Sn17Zn7P22Br8

Stefanoski

Reshetova

Shevelkov

et al. 2009

Journal of Elec Materi

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We report on temperature-dependent thermal conductivity, resistivity, and Seebeck coefficient of two polycrystalline Br-containing Sn-clathrate compounds with the type I crystal structure. Interstitial Br atoms reside inside the polyhedral cavities formed by the framework, resulting in hole conduction. The framework bonding directly influences the transport properties of these two compositions. The transport properties of these two clathrates are compared with those of other Sn-clathrates. We also discuss our results in terms of the potential for thermoelectric applications.

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Novel Compounds Sn10In14P22I8 and Sn14In10P21.2I8 with Clathrate I Structure: Synthesis and Crystal and Electronic Structure

Cited by 55 publications

References 18 publications

Crystal structure and thermoelectric properties of the type-I clathrate compound Ba8Ge43 with an ordered arrangement of Ge vacancies

Crystal structure and thermoelectric properties of the type-I clathrate compound Ba8Ge43 with an ordered arrangement of Ge vacancies

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

Low-Temperature Transport Properties of Sn24P19.3Br8 and Sn17Zn7P22Br8

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