Effect of the Fermi Energy on the Stability of Superlattices

Nicholas, J.F.

doi:10.1088/0370-1298/66/3/301

Cited by 39 publications

(10 citation statements)

References 6 publications

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“…24 Introduction of the zone tends to stabilize the ordered structure by the reduction of the total energy due to the readjustment of electron distribution, simultaneously modifying the Fermi surface. 25 If the excess electrons in the conduction band move to the valence band in order to readjust the electron distribution in Ba 8 Ge 43 on the formation of the superlattice structure, the Fermi surface falls to the energy band gap so as to exhibit a semiconducting behavior.…”

Section: Discussionmentioning

confidence: 99%

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: 99%

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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“…Now let us consider how this change in y can be explained. Suggestions h a w been made by Muto [6], Slater [7], and Nicholas [8] about the effect of superlattice formation on the electronic structure which is expressed in our oxperiments by n ( E g ) . When a superlattice forms in an alloy, new Brillouin zone boundaries are formed corresponding to the extra Bragg reflection, giving rise to a reduction in the size of the basic Brillouin zone.…”

Section: Discussionmentioning

confidence: 99%

Low Temperature Specific Heat of Ordered and Disordered FeCo

Kuentzler

1973

Physica Status Solidi (b)

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“…From measurements of the y-coefficient alone information on the nature of the change of the d-band shape cannot be obtained. A qualitative theoretical treatment of the problem was described by Nicholas [28]. Accordingly More detailed information on the change of the d-band shape on ordering of Pd,Fe is only possible, if calorimetric nieasurements will be supplemented by other methods of investigation, e.g.…”

Section: (4)mentioning

confidence: 99%

Effect of long-range order and hydrogen content on the low-temperature heat capacity of Pd3Fe

Marker

Wolf

Baranowski

1974

Phys. Stat. Sol. (a)

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I n the range from 2 to 8 O K the heat capacity of Pd,Fe was measured in the ordered and disordered states. A great decrease of the y-coefficient, of electronic heat capacity with increased long-range order parameter was observed. Charging of the ordered sample with hydrogen does not influence the magnitude of y. As reason for the observed change of y a strong change of the d-band shape in ordering is assumed. I m Bereich von 2 bis 8 O K wurde die molare Warmekapazitat von Pd,Fe im geordneten und ungeordneten Zustand gemessen. Dabei wurde eine starke Erniedrigung des y-Koeffizienten der Elektronenwarnie mit steigendem Fernordnungsgrad festgestellt. Die Beladung der geordneten Probe mit Wasserstoff blieb auf den y-Koeffizienten ohne EinfluO. Als Ursache der beobachteten Veranderung von y wird eine starke Veranderung der d-Bandgestalt beim Ordnen angenommen.

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Effect of the Fermi Energy on the Stability of Superlattices

Cited by 39 publications

References 6 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

Low Temperature Specific Heat of Ordered and Disordered FeCo

Effect of long-range order and hydrogen content on the low-temperature heat capacity of Pd3Fe

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