Title
Cationic clathrate of type-III <tex>$Ge_{172-x}P_{x}Te_{y}$</tex> (<tex>$y\approx21,5$</tex>, <tex>$x\approx2y$</tex>) : synthesis, crystal structure and thermoelectric properties Cationic clathrate of type-III <tex>$Ge_{172-x}P_{x}Te_{y}$</tex> (<tex>$y\approx21,5$</tex>, <tex>$x\approx2y$</tex>) : synthesis, crystal structure and thermoelectric properties
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Easton, Pa ,
Subject
Physics
Chemistry
Source (journal)
Inorganic chemistry / American Chemical Society. - Easton, Pa
Volume/pages
52(2013) :14 , p. 8272-8279
ISSN
0020-1669
ISI
000322087100052
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
A first germanium-based cationic clathrate of type-III, Ge129.3P42.7Te21.53, was synthesized and structurally characterized (space group P42/mnm, a = 19.948(3) Å, c = 10.440(2) Å, Z = 1). In its crystal structure, germanium and phosphorus atoms form three types of polyhedral cages centered with Te atoms. The polyhedra share pentagonal and hexagonal faces to form a 3D framework. Despite the complexity of the crystal structure, the Ge129.3P42.7Te21.53 composition corresponds to the Zintl counting scheme with a good accuracy. Ge129.3P42.7Te21.53 demonstrates semiconducting/insulating behavior of electric resistivity, high positive Seebeck coefficient (500 μV K1 at 300 K), and low thermal conductivity (<0.92 W m1 K1) within the measured temperature range.
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