Darstellung und kristallstruktur von Ba2Cd3Bi4

Cordier, G.; Woll, P.; Schäfer, Herbert

doi:10.1016/0022-5088(82)90197-7

Cited by 19 publications

(16 citation statements)

References 9 publications

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“…The observed Cd-Bi (from 2.9688 (14) to 3.0565 (14) Å) and Bi-Bi distances (3.3514 (3) Å) are comparable to those reported for other cadmium-bismuthides such as BaCdBi 2 (Brechtel et al, 1981), Ba 11 Cd 8 Bi 14 (Xia & Bobev, 2006a), Eu 10 Cd 8 Bi 12 (Xia & Bobev, 2007), Sr 21 Cd 4 Bi 18 , Ba 2 Cd 3 Bi 4 (Cordier et al, 1982;Xia & Bobev, 2006b). The Cd-Bi distances involving the Cd2 atoms are shorter, but due to the very low occupancy of the Cd site (close to 1/8 occupied), the physical significance of such contacts is hard to be rationalized.…”

Section: à3supporting

confidence: 67%

“…Isotypic compounds are not known; however, there are several compounds whose structures are based on fused CdBi 4 tetrahedral fragments, including BaCdBi 2 (Brechtel et al, 1981) (Cordier et al, 1982;Xia & Bobev, 2006b). The serendipitous discovery of the title compound was the result of a systematic study of the Ba-Cd-Bi system, inspired from the identification of Ba 3 Cd 2 Sb 4 (Saparov et al, 2008).…”

Section: Related Literaturementioning

confidence: 99%

“…Condensed trigonal CdBi 5 bi-pyramids and distorted CdBi 6 octahedra are known for Ba 2 Cd 3 Bi 4 (Cordier et al, 1982;Xia & Bobev, 2006b). The serendipitous discovery of the title compound was the result of a systematic study of the Ba-Cd-Bi system, inspired from the identification of Ba 3 Cd 2 Sb 4 (Saparov et al, 2008).…”

Section: Related Literaturementioning

confidence: 99%

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Dibarium tricadmium bismuthide(-I,-III) oxide, Ba₂Cd_3−δBi₃O

Xia

Bobev

2010

Acta Cryst E

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Key indicators: single-crystal X-ray study; T = 120 K; mean (Bi-Cd) = 0.001 Å; disorder in main residue; R factor = 0.032; wR factor = 0.073; data-to-parameter ratio = 17.3.Ba 2 Cd 2.13 Bi 3 O, a new bismuthide(-I,-III) oxide, crystallizes with a novel body-centered tetragonal structure (Pearson code tI36). The crystal structure contains eight crystallographically unique sites in the asymmetric unit, all on special positions. Two Ba, one Cd and two Bi atoms have site symmetry 4mm, the third Bi atom has mmm. and the O atom has 4m2 symmetry; the second Cd site (2mm. symmetry) is not fully occupied. The layered structure is complex and can be considered as an intergrowth of two types of slabs, viz. BaCdBiO with the ZrCuSiAs type and BaCd 2 Bi 2 with the CeMg 2 Si 2 type. Related literatureIsotypic compounds are not known; however, there are several compounds whose structures are based on fused CdBi 4 tetrahedral fragments, including BaCdBi 2 (Brechtel et al., 1981) (Cordier et al., 1982;Xia & Bobev, 2006b). The serendipitous discovery of the title compound was the result of a systematic study of the Ba-Cd-Bi system, inspired from the identification of Ba 3 Cd 2 Sb 4 (Saparov et al., 2008). The compound BaCdSbF (Saparov & Bobev, 2010) is an example of a structure that epitomizes the BaCdBiO slabs. Recently, the idea that intermetallic oxide-pnictides and fluoride-pnictides could be a widespread class of quaternary solids has been discussed on the examples of Ba 5 Cd 2 Sb 5 O x (0.5

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Section: à3supporting

confidence: 67%

Section: Related Literaturementioning

confidence: 99%

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Dibarium tricadmium bismuthide(-I,-III) oxide, Ba₂Cd_3−δBi₃O

Xia

Bobev

2010

Acta Cryst E

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“…Consequently, void filling, substitution, and/or doping offer fruitful tools to tune the charge carrier concentration of clathrates in an optimal manner to tailor the highest possible thermoelectric performance. So far, only limited information is available on the thermoelectric performance of clathrates stabilized by platinum metals, such as Pd or Pt: the formation and crystal structure of type-I clathrates Ba 8 M x Ge 46−x ͑M = Pd, Pt, x ϳ 6͒ have been investigated, 5 but no link was made to the binary clathrates Ba 6 Ge 25 ͑Ref. 6͒ and Ba 8 Ge 43 ᮀ 3 ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

Clathrate formation in the Ba-Pd-Ge system: Phase equilibria, crystal structure, and physical properties

et al. 2007

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Phase relations at subsolidus temperatures as well as at T = 800°C, crystallographic data, electrical and thermal transport measurements, and heat capacity data are reported for several compositions within the clathrate type-I solid solution: Ba 8 Pd x Ge 46−x−y ᮀ y ͑ᮀ is a vacancy͒. The solid solution derives from binary clathrate Ba 8 Ge 43 ᮀ 3 with a solubility limit of 3.8 Pd atoms per formula unit at T = 800°C. Structural investigations throughout the homogeneity region confirm cubic primitive symmetry consistent with the space group type Pm3n and lattice parameters ranging from a = 1.0657͑2͒ nm for Ba 8 Ge 43 ᮀ 3 to a = 1.077 41͑2͒ nm for Ba 8 Pd 3.8 Ge 42.2 ᮀ 0.0 . The primary field of clathrate crystallization has been elucidated from micrography and differential thermal analyses. Both heat capacity and inelastic neutron diffraction define a low-lying, almost localized, phonon branch. Studies of transport properties evidence electrons as the majority charge carriers for most of the homogeneity region; however, at the Pd-rich limit, holes dominate the electronic transport. The crossover between both regimes provides appropriate conditions for attractively high Seebeck values. The lattice contribution dominates the overall thermal conductivity.

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“…6͒ and can partly be explained by a lower l of samples with lower n. 6,10 For Ba 8 Ni 6−x Ge 40+x the framework structure is more ordered with the Ni atoms preferring to occupy the 6c site. 13 . In this case the number of impurity/localized states is reduced, and consequently the resonance scattering is reduced giving no clear dips in L ͑T͒ of any of the Ba 8 Ni 6−x Ge 40+x samples.…”

mentioning

confidence: 99%

Strong phonon charge carrier coupling in thermoelectric clathrates

2006

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The origin of the very low and glasslike lattice thermal conductivity ͑ L ͒ in highly crystalline clathrates has been intensely discussed. Guest atom tunneling, guest atom resonant scattering, disorder scattering, and soft potentials have been proposed as possible explanations. However, none of these models can explain the fundamental difference in L between n-and p-type Ba 8 Ga 16 Ge 30 . Here we provide a comprehensive explanation through analysis of the physical properties of a range of Ba 8 In 16−x Ge 30−y ᮀ x+y and Ba 8 Ni 6−x Ge 40+x samples. We show that L is intimately linked to the charge carriers, and propose that the glasslike L is a consequence of strong phonon charge carrier coupling. In general the influence of charge carriers on L has been studied only in relatively lightly doped and structurally ordered semiconducting materials. Clathrates constitute a class of materials with relatively large charge carrier concentrations in combination with structural disorder. This opens up the possibility of studying the influence of charge carriers on L in the limit where L and e are of equal magnitude.

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Darstellung und kristallstruktur von Ba2Cd3Bi4

Cited by 19 publications

References 9 publications

Dibarium tricadmium bismuthide(-I,-III) oxide, Ba₂Cd_3−δBi₃O

Dibarium tricadmium bismuthide(-I,-III) oxide, Ba₂Cd_3−δBi₃O

Clathrate formation in the Ba-Pd-Ge system: Phase equilibria, crystal structure, and physical properties

Strong phonon charge carrier coupling in thermoelectric clathrates

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Darstellung und kristallstruktur von Ba2Cd3Bi4

Cited by 19 publications

References 9 publications

Dibarium tricadmium bismuthide(-I,-III) oxide, Ba2Cd3−δBi3O

Dibarium tricadmium bismuthide(-I,-III) oxide, Ba2Cd3−δBi3O

Clathrate formation in the Ba-Pd-Ge system: Phase equilibria, crystal structure, and physical properties

Strong phonon charge carrier coupling in thermoelectric clathrates

Contact Info

Product

Resources

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Dibarium tricadmium bismuthide(-I,-III) oxide, Ba₂Cd_3−δBi₃O

Dibarium tricadmium bismuthide(-I,-III) oxide, Ba₂Cd_3−δBi₃O