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Title: Preparation and chemical properties of the skutterudites (Ce-Yb) {sub y}Fe{sub 4-x}(Co/Ni) {sub x}Sb{sub 12}

Abstract

The double-filled skutterudites Ce {sub y/2}Yb {sub y/2}Fe{sub 4-x}Co {sub x}Sb{sub 12} and Ce {sub y/2}Yb {sub y/2}Fe{sub 4-x}Ni {sub x}Sb{sub 12} have been synthesized as single phase materials. The evolution of the lattice parameters and of the filling fractions with substitutions on the transition metal site have been studied by X-ray diffraction and electron probe microanalysis, respectively. Both results were compared to that of single filled series (Ce/Yb) {sub y}Fe{sub 4-x}(Co/Ni) {sub x}Sb{sub 12}. It shows that double-filled skutterudites can be understood as a solid solution between single filled ones. The valence states of Ce and Yb in all series have been studied using X-ray absorption spectroscopy at the L{sub 3} edges, and we discuss their relationships with structural parameters. Ce is always trivalent, whereas Yb valence state decreases as Yb fraction increases. No distortion of the environment or sub-position of Yb in the cage have been seen by neutron diffraction. The Seebeck coefficient has been measured using a home made apparatus from 120 K to 300 K. It shows a crossover from p- to n-type conductivity for Co or Ni rich skutterudites in the six series. We discuss the influence on the room temperature thermopower of valence states,more » filling fractions and substitution rate on the transition metal site. Thermopower seems to be only driven by charge carriers concentration.« less

Authors:
 [1];  [1];  [1];  [1];  [2]
  1. Laboratoire de Chimie Metallurgique des Terres-Rares, ISCSA-CNRS, 2-8 rue Henri Dunant 94320 Thiais (France)
  2. Laboratoire Leon Brillouin, CEA-CNRS, Centre d'etudes de Saclay, 91191 Gif sur Yvette (France)
Publication Date:
OSTI Identifier:
20889751
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 40; Journal Issue: 3; Other Information: DOI: 10.1016/j.materresbull.2004.10.023; PII: S0025-5408(04)00342-3; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; CHARGE CARRIERS; CHEMICAL PROPERTIES; COMPLEXES; ELECTRICAL PROPERTIES; ELECTRON MICROPROBE ANALYSIS; INTERMETALLIC COMPOUNDS; LATTICE PARAMETERS; NEUTRON DIFFRACTION; SEMICONDUCTOR MATERIALS; SOLID SOLUTIONS; TEMPERATURE RANGE 0273-0400 K; TRANSITION ELEMENTS; VALENCE; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY

Citation Formats

Berardan, D, Alleno, E, Godart, C, Rouleau, O, and Rodriguez-Carvajal, J. Preparation and chemical properties of the skutterudites (Ce-Yb) {sub y}Fe{sub 4-x}(Co/Ni) {sub x}Sb{sub 12}. United States: N. p., 2005. Web. doi:10.1016/j.materresbull.2004.10.023.
Berardan, D, Alleno, E, Godart, C, Rouleau, O, & Rodriguez-Carvajal, J. Preparation and chemical properties of the skutterudites (Ce-Yb) {sub y}Fe{sub 4-x}(Co/Ni) {sub x}Sb{sub 12}. United States. https://doi.org/10.1016/j.materresbull.2004.10.023
Berardan, D, Alleno, E, Godart, C, Rouleau, O, and Rodriguez-Carvajal, J. Tue . "Preparation and chemical properties of the skutterudites (Ce-Yb) {sub y}Fe{sub 4-x}(Co/Ni) {sub x}Sb{sub 12}". United States. https://doi.org/10.1016/j.materresbull.2004.10.023.
@article{osti_20889751,
title = {Preparation and chemical properties of the skutterudites (Ce-Yb) {sub y}Fe{sub 4-x}(Co/Ni) {sub x}Sb{sub 12}},
author = {Berardan, D and Alleno, E and Godart, C and Rouleau, O and Rodriguez-Carvajal, J},
abstractNote = {The double-filled skutterudites Ce {sub y/2}Yb {sub y/2}Fe{sub 4-x}Co {sub x}Sb{sub 12} and Ce {sub y/2}Yb {sub y/2}Fe{sub 4-x}Ni {sub x}Sb{sub 12} have been synthesized as single phase materials. The evolution of the lattice parameters and of the filling fractions with substitutions on the transition metal site have been studied by X-ray diffraction and electron probe microanalysis, respectively. Both results were compared to that of single filled series (Ce/Yb) {sub y}Fe{sub 4-x}(Co/Ni) {sub x}Sb{sub 12}. It shows that double-filled skutterudites can be understood as a solid solution between single filled ones. The valence states of Ce and Yb in all series have been studied using X-ray absorption spectroscopy at the L{sub 3} edges, and we discuss their relationships with structural parameters. Ce is always trivalent, whereas Yb valence state decreases as Yb fraction increases. No distortion of the environment or sub-position of Yb in the cage have been seen by neutron diffraction. The Seebeck coefficient has been measured using a home made apparatus from 120 K to 300 K. It shows a crossover from p- to n-type conductivity for Co or Ni rich skutterudites in the six series. We discuss the influence on the room temperature thermopower of valence states, filling fractions and substitution rate on the transition metal site. Thermopower seems to be only driven by charge carriers concentration.},
doi = {10.1016/j.materresbull.2004.10.023},
url = {https://www.osti.gov/biblio/20889751}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 3,
volume = 40,
place = {United States},
year = {2005},
month = {3}
}