View : 47 Download: 0

Structure and thermoelectric properties of Ba6Ge25-x, Ba6Ge23Sn2, and Ba6Ge22In3: Zintl phases with a chiral clathrate structure

Title
Structure and thermoelectric properties of Ba6Ge25-x, Ba6Ge23Sn2, and Ba6Ge22In3: Zintl phases with a chiral clathrate structure
Authors
Kim, SJHu, SQUher, CHogan, THuang, BQCorbett, JDKanatzidis, MG
Ewha Authors
김성진
SCOPUS Author ID
김성진scopus
Issue Date
2000
Journal Title
JOURNAL OF SOLID STATE CHEMISTRY
ISSN
0022-4596JCR Link
Citation
vol. 153, no. 2, pp. 321 - 329
Keywords
chiral clathratethermoelectriczintl phasephonon gaselectron crystal
Publisher
ACADEMIC PRESS INC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
A single phase of Ba6Ge25-x (x similar to 1) was obtained from a direct element combination reaction in a sealed graphite tube at 830 degrees C, Its structure was determined by single-crystal X-ray diffraction methods, Ba6Ge25-x adopts the chiral cubic space group P4(1)32 (No, 213) with dimensions of a = 14.5483(2) Angstrom and Z = 4, The structure consists of helical chains of Ba atom-centered pentagonal dodecahedra, Ba@Ge-20, and zeolite-like cages formed by those chains. There are vacancies distributed over the Ge sites giving a composition of Ba6Ge24, in which charge balance according to the Zintl formalism is retained, The compound therefore satisfies the classical Zintl concept, Polycrystalline ingots of Ba6Ge25-x showed an electrical conductivity of 2000 S/cm and a Seebeck coefficient of -18 mu V/K at room temperature. An anomalous broad transition in the electrical conductivity and Seebeck coefficient was observed at similar to 100 K, Ba6Ge23.32Sn1.68 and Ba6Ge21.93In3.07 as ternary derivatives of Ba6Ge25-x were also synthesized and their structural and physical properties compared with those of Ba6Ge25-x. (C) 2000 Academic Press.
DOI
10.1006/jssc.2000.8777
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE