Structure and thermoelectric characterization of AxBa 8-xAl14Si31 (A = Sr, Eu) single crystals

Cathie L. Condron, Susan M. Kauzlarich, G. S. Nolas

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Single crystals of AxBa8-xAl14Si 31 (A = Sr, Eu) were grown using a molten Al flux technique. Single-crystal X-ray diffraction confirms that AxBa 8-xAl14Si31 (A = Sr, Eu) crystallize with the type I clathrate structure, and phase purity was determined with powder X-ray diffraction. Stoichiometry was determined to be Sr0.7Ba 7.3Al14Si31 and Eu0.3Ba 7.7-Al14Si31 by electron microprobe analysis. These AxBa8-xAl14Si31 phases can be described as framework-deficient clathrate type I structures with the general formula, AxBa8-xAlySi42-3y/4[] 4-1/4y. DSC measurements indicate that these phases melt congruently at 1413 and 1415 K for Sr0.7Ba7.3Al14Si 31 and Eu0.3Ba7.7Al14Si 31, respectively. Temperature-dependent resistivity indicates metallic behavior, and the negative Seebeck coefficient indicates transport processes dominated by electrons as carriers. Thermal conductivity of these phases remains low with Sr0.7Ba7.3-Al14Si 31 having the lowest values.

Original languageEnglish (US)
Pages (from-to)2556-2562
Number of pages7
JournalInorganic Chemistry
Volume46
Issue number7
DOIs
StatePublished - Apr 2 2007

Fingerprint

clathrates
Single crystals
Seebeck coefficient
single crystals
Electron probe microanalysis
Seebeck effect
diffraction
Stoichiometry
X ray powder diffraction
Molten materials
stoichiometry
Thermal conductivity
purity
electrons
x rays
thermal conductivity
Fluxes
X ray diffraction
electrical resistivity
Electrons

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Structure and thermoelectric characterization of AxBa 8-xAl14Si31 (A = Sr, Eu) single crystals. / Condron, Cathie L.; Kauzlarich, Susan M.; Nolas, G. S.

In: Inorganic Chemistry, Vol. 46, No. 7, 02.04.2007, p. 2556-2562.

Research output: Contribution to journalArticle

Condron, Cathie L. ; Kauzlarich, Susan M. ; Nolas, G. S. / Structure and thermoelectric characterization of AxBa 8-xAl14Si31 (A = Sr, Eu) single crystals. In: Inorganic Chemistry. 2007 ; Vol. 46, No. 7. pp. 2556-2562.
@article{34bfa4466b4240708565863b5d4bd158,
title = "Structure and thermoelectric characterization of AxBa 8-xAl14Si31 (A = Sr, Eu) single crystals",
abstract = "Single crystals of AxBa8-xAl14Si 31 (A = Sr, Eu) were grown using a molten Al flux technique. Single-crystal X-ray diffraction confirms that AxBa 8-xAl14Si31 (A = Sr, Eu) crystallize with the type I clathrate structure, and phase purity was determined with powder X-ray diffraction. Stoichiometry was determined to be Sr0.7Ba 7.3Al14Si31 and Eu0.3Ba 7.7-Al14Si31 by electron microprobe analysis. These AxBa8-xAl14Si31 phases can be described as framework-deficient clathrate type I structures with the general formula, AxBa8-xAlySi42-3y/4[] 4-1/4y. DSC measurements indicate that these phases melt congruently at 1413 and 1415 K for Sr0.7Ba7.3Al14Si 31 and Eu0.3Ba7.7Al14Si 31, respectively. Temperature-dependent resistivity indicates metallic behavior, and the negative Seebeck coefficient indicates transport processes dominated by electrons as carriers. Thermal conductivity of these phases remains low with Sr0.7Ba7.3-Al14Si 31 having the lowest values.",
author = "Condron, {Cathie L.} and Kauzlarich, {Susan M.} and Nolas, {G. S.}",
year = "2007",
month = "4",
day = "2",
doi = "10.1021/ic062115v",
language = "English (US)",
volume = "46",
pages = "2556--2562",
journal = "Inorganic Chemistry",
issn = "0020-1669",
publisher = "American Chemical Society",
number = "7",

}

TY - JOUR

T1 - Structure and thermoelectric characterization of AxBa 8-xAl14Si31 (A = Sr, Eu) single crystals

AU - Condron, Cathie L.

AU - Kauzlarich, Susan M.

AU - Nolas, G. S.

PY - 2007/4/2

Y1 - 2007/4/2

N2 - Single crystals of AxBa8-xAl14Si 31 (A = Sr, Eu) were grown using a molten Al flux technique. Single-crystal X-ray diffraction confirms that AxBa 8-xAl14Si31 (A = Sr, Eu) crystallize with the type I clathrate structure, and phase purity was determined with powder X-ray diffraction. Stoichiometry was determined to be Sr0.7Ba 7.3Al14Si31 and Eu0.3Ba 7.7-Al14Si31 by electron microprobe analysis. These AxBa8-xAl14Si31 phases can be described as framework-deficient clathrate type I structures with the general formula, AxBa8-xAlySi42-3y/4[] 4-1/4y. DSC measurements indicate that these phases melt congruently at 1413 and 1415 K for Sr0.7Ba7.3Al14Si 31 and Eu0.3Ba7.7Al14Si 31, respectively. Temperature-dependent resistivity indicates metallic behavior, and the negative Seebeck coefficient indicates transport processes dominated by electrons as carriers. Thermal conductivity of these phases remains low with Sr0.7Ba7.3-Al14Si 31 having the lowest values.

AB - Single crystals of AxBa8-xAl14Si 31 (A = Sr, Eu) were grown using a molten Al flux technique. Single-crystal X-ray diffraction confirms that AxBa 8-xAl14Si31 (A = Sr, Eu) crystallize with the type I clathrate structure, and phase purity was determined with powder X-ray diffraction. Stoichiometry was determined to be Sr0.7Ba 7.3Al14Si31 and Eu0.3Ba 7.7-Al14Si31 by electron microprobe analysis. These AxBa8-xAl14Si31 phases can be described as framework-deficient clathrate type I structures with the general formula, AxBa8-xAlySi42-3y/4[] 4-1/4y. DSC measurements indicate that these phases melt congruently at 1413 and 1415 K for Sr0.7Ba7.3Al14Si 31 and Eu0.3Ba7.7Al14Si 31, respectively. Temperature-dependent resistivity indicates metallic behavior, and the negative Seebeck coefficient indicates transport processes dominated by electrons as carriers. Thermal conductivity of these phases remains low with Sr0.7Ba7.3-Al14Si 31 having the lowest values.

UR - http://www.scopus.com/inward/record.url?scp=34247127764&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34247127764&partnerID=8YFLogxK

U2 - 10.1021/ic062115v

DO - 10.1021/ic062115v

M3 - Article

C2 - 17284029

AN - SCOPUS:34247127764

VL - 46

SP - 2556

EP - 2562

JO - Inorganic Chemistry

JF - Inorganic Chemistry

SN - 0020-1669

IS - 7

ER -