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Preparation and characterization of new phases in Na-(U0.5Pu0.5)-Mo-O and Na-(ThxU1−x)-Mo-O (x = 0.5 and 0.8) systems by X-ray and thermal methods

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Published/Copyright: November 7, 2014
Radiochimica Acta
From the journal Radiochimica Acta Volume 103 Issue 1

Abstract

Na2(ThxU1−x)(MoO4)3 and Na4(ThxU1−x)(MoO4)4 (x = 0.5 and 0.8) were synthesized, by reacting (ThxU1−x)(MoO4)2 with Na2MoO4 in appropriate molar ratios at 873 K in an evacuated quartz ampoule for 25 h. While Na2(U0.5Pu0.5)(MoO4)3 and Na4(U0.5Pu0.5)(MoO4)4 were synthesized, by reacting (U0.5Pu0.5)(MoO4)2 with Na2MoO4 in appropriate molar ratios at 873 K in argon atmosphere for 45 h. The crystal structure of these compounds were derived from powder XRD data in a tetragonal system (space group: I41/a) by Rietveld profile method. Thermogravimetric curves of Na2(ThxU1−x)(MoO4)3 and Na4(ThxU1−x)(MoO4)4 did not show any weight changes up to 973 K in helium atmosphere. High temperature X-ray diffraction (HTXRD) studies of Na2(ThxU1−x)(MoO4)3 and Na4(ThxU1−x)(MoO4)4 in vacuum showed positive thermal expansion in the temperature range of 298 to 873 K.

Keywords: Crystal structure; X-ray diffraction; Themogravimetric Analysis (TGA); Thermal expansion
Received: 2014-3-20
Accepted: 2014-8-5
Published Online: 2014-11-7
Published in Print: 2015-1-28

©2014 Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Definitions of radioisotope thick target yields
  3. Measurement of yield of residues produced in 12C+natY reaction and subsequent separation of 97Ru from Y target using cation exchange resin
  4. Digital liquid-scintillation counting and effective pulse-shape discrimination with artificial neural networks
  5. Actinide oxalate complexes formation as a function of temperature by capillary electrophoresis coupled with inductively coupled plasma mass spectrometry
  6. Preparation and characterization of new phases in Na-(U0.5Pu0.5)-Mo-O and Na-(ThxU1−x)-Mo-O (x = 0.5 and 0.8) systems by X-ray and thermal methods
  7. Structure and spectroscopy of uranyl and thorium complexes with substituted phosphine oxide ligands
  8. Redox chemistry of Tc(VII)/Tc(IV) in dilute to concentrated NaCl and MgCl2 solutions
  9. Synthesis of alumina 99Mo-molybdate(VI) gel matrices and evaluation of 99mTc elution performance
https://doi.org/10.1515/ract-2014-2268
Keywords for this article
Crystal structure; X-ray diffraction; Themogravimetric Analysis (TGA); Thermal expansion

Articles in the same Issue

  1. Frontmatter
  2. Definitions of radioisotope thick target yields
  3. Measurement of yield of residues produced in 12C+natY reaction and subsequent separation of 97Ru from Y target using cation exchange resin
  4. Digital liquid-scintillation counting and effective pulse-shape discrimination with artificial neural networks
  5. Actinide oxalate complexes formation as a function of temperature by capillary electrophoresis coupled with inductively coupled plasma mass spectrometry
  6. Preparation and characterization of new phases in Na-(U0.5Pu0.5)-Mo-O and Na-(ThxU1−x)-Mo-O (x = 0.5 and 0.8) systems by X-ray and thermal methods
  7. Structure and spectroscopy of uranyl and thorium complexes with substituted phosphine oxide ligands
  8. Redox chemistry of Tc(VII)/Tc(IV) in dilute to concentrated NaCl and MgCl2 solutions
  9. Synthesis of alumina 99Mo-molybdate(VI) gel matrices and evaluation of 99mTc elution performance
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