PuCrO$_3$ compound synthesis, structural and thermodynamic studies - Archive ouverte HAL Access content directly
Conference Papers Year : 2015

PuCrO$_3$ compound synthesis, structural and thermodynamic studies

(1) , (1) , (1) , (1) , (1) , (1) , (1) , (1) , (1) , (1) , (2) , (3)
1
2
3

Abstract

The synthesis of PuCrO$_3$ compound starting from metallic and/or sesquioxide chromium and PuO2 powder mixtures in stoichiometric ratios has been studied at different temperatures under atmospheres with a varying oxygen potential (Ar, Ar + 5% H2, Ar + 5% H$_2$ + 850 ppm H$_2$O). The structure of the polycrystalline perovskite compound PuCrO$_3$ was investigated by means of an X ray powder pattern fitting. A Rietveld analysis was performed using the computer program JANA2000. PuCrO$_3$ crystallizes in the orthorhombic space group Pbnm with a = 549.58(3) pm, b = 771.99(3) pm and c = 543.97(3) pm. A XAS study gave oxidation states +III for both chromium and plutonium. The heat capacity of PuCrO3 was measured by means of a differential scanning calorimeter (DSC) in the temperature range of 373-1373 K. Debye temperature as well as electronic defect energies have been fitted from these measurements. Enthalpy increment, entropy and free energy function of PuCrO$_3$ have been calculated from the measured heat capacity and estimated data as a function of temperature.
Fichier principal
Vignette du fichier
JDA_2015_JLé-6.pdf (1.57 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-02489490 , version 1 (19-06-2020)

Identifiers

  • HAL Id : cea-02489490 , version 1

Cite

J. Léchelle, R. C. Belin, P. M. Martin, C. Martial, A. Pieragnoli, et al.. PuCrO$_3$ compound synthesis, structural and thermodynamic studies. JdA2015 - 45èmes Journées des actinides, Apr 2015, Prague, Czech Republic. ⟨cea-02489490⟩
33 View
27 Download

Share

Gmail Facebook Twitter LinkedIn More