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Electronic specific heat of transition metal carbides; Chaleur specifique electronique de carbures de metaux de transition

Abstract

The experimental results that make it possible to define the band structure of transition metal carbides having an NaCI structure are still very few. We have measured the electronic specific heat of some of these carbides of varying electronic concentration (TiC, either stoichiometric or non-stoichiometric, TaC and mixed (Ti, Ta) - C). We give the main characteristics (metallography, resistivity, X-rays) of our samples and we describe the low temperature specific heat apparatus which has been built. In one of these we use helium as the exchange gas. The other is set up with a mechanical contact. The two use a germanium probe for thermometer. The measurement of the temperature using this probe is described, as well as the various measurement devices. The results are presented in the form of a rigid band model and show that the density of the states at the Fermi level has a minimum in the neighbourhood of the group IV carbides. (author) [French] Les donnees experimentales permettant de preciser la structure de bandes des carbures de metaux de transition de structure NaCI sont encore peu.nombreuses. Nous avons mesure la chaleur specifique electronique de certains de ces carbures, de differentes concentrations electroniques (TiC stoechiometrique ou non,  More>>
Authors:
Conte, R [1] 
  1. Commissariat a l'Energie Atomique, Fontenay-aux-Roses (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 15, 1964
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-2854
Resource Relation:
Other Information: TH: These sciences; 58 refs
Subject:
36 MATERIALS SCIENCE; CALORIMETERS; ELECTRONIC SPECIFIC HEAT; FERMI LEVEL; TANTALUM CARBIDES; TITANIUM CARBIDES
OSTI ID:
20723394
Research Organizations:
CEA Fontenay-aux-Roses, 92 (France); Faculte des Sciences de l'Universite de Paris, Centre d'Orsay, 91 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2854035894
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
59 pages
Announcement Date:
May 13, 2006

Citation Formats

Conte, R. Electronic specific heat of transition metal carbides; Chaleur specifique electronique de carbures de metaux de transition. France: N. p., 1964. Web.
Conte, R. Electronic specific heat of transition metal carbides; Chaleur specifique electronique de carbures de metaux de transition. France.
Conte, R. 1964. "Electronic specific heat of transition metal carbides; Chaleur specifique electronique de carbures de metaux de transition." France.
@misc{etde_20723394,
title = {Electronic specific heat of transition metal carbides; Chaleur specifique electronique de carbures de metaux de transition}
author = {Conte, R}
abstractNote = {The experimental results that make it possible to define the band structure of transition metal carbides having an NaCI structure are still very few. We have measured the electronic specific heat of some of these carbides of varying electronic concentration (TiC, either stoichiometric or non-stoichiometric, TaC and mixed (Ti, Ta) - C). We give the main characteristics (metallography, resistivity, X-rays) of our samples and we describe the low temperature specific heat apparatus which has been built. In one of these we use helium as the exchange gas. The other is set up with a mechanical contact. The two use a germanium probe for thermometer. The measurement of the temperature using this probe is described, as well as the various measurement devices. The results are presented in the form of a rigid band model and show that the density of the states at the Fermi level has a minimum in the neighbourhood of the group IV carbides. (author) [French] Les donnees experimentales permettant de preciser la structure de bandes des carbures de metaux de transition de structure NaCI sont encore peu.nombreuses. Nous avons mesure la chaleur specifique electronique de certains de ces carbures, de differentes concentrations electroniques (TiC stoechiometrique ou non, TaC et mixtes (Ti, Ta) - C). Nous donnons les principales caracteristiques (metallographie, resistivite, rayon X), de nos echantillons, et nous decrivons l'appareillage de chaleur specifique a basse temperature realise. Dans l'un nous utilisons l'helium comme gaz d'echange. L'autre est monte avec un contact mecanique. Les deux utilisent une sonde au germanium comme thermometre. La mesure de la resistance de cette sonde est decrite, ainsi que les differents montages de mesure. Les resultats, presentes dans un modele de bande rigide, font apparaitre que la densite des etats au niveau de Fermi presente un minimum au voisinage des carbures du groupe IV. (auteur)}
place = {France}
year = {1964}
month = {Jul}
}