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      https://www.ias.ac.in/article/fulltext/boms/045/0215

    • Keywords

       

      High pressure; compressibility; order–disorder transition; actinides.

    • Abstract

       

      Rare-earth uranates-RE$_6$UO$_{12}$ are synthesized by heating mixture of uranium oxide and rare-earth oxides in 1:6 ratio above 1273 K. These compounds stabilize in rhombohedral structure at ambient. High-pressure (HP) X-ray diffraction studies reveal that the compounds are stable at lower pressures, beyond which disorder is seen to originate and compound has a tendency to amporphize at very HPs. The a-axis of the lattice is found to be more rigid as compared to c-axis because of corner sharing polyhedra along a-axis. Anomalous compressibility behaviour is seen in Gd$_6$UO$_{12}$, where sharp decrease in the bulk modulus is observed. The behaviour is against the normal trend of compressibility in RE$_6$UO$_{12}$ compounds along rare-earth cation series.

    • Author Affiliations

       

      BALMUKUND SHUKLA1 N R SANJAY KUMAR1 HRUDANANDA JENA2 ANUJ UPADHYAY3 N V CHANDRA SHEKAR1

      1. High Pressure Physics Section, Condensed Matter Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
      2. Materials Chemistry Division-Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
      3. Synchrotron Utilization Section, Raja Ramanna Center for Advanced Technology, Indore 452013, India
    • Dates

       
  • Bulletin of Materials Science | News

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