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Compressibility studies of RE$_6$UO$_{12}$ at extreme conditions of pressure
BALMUKUND SHUKLA N R SANJAY KUMAR HRUDANANDA JENA ANUJ UPADHYAY N V CHANDRA SHEKAR
Volume 45 Published: 26 October 2022 Article ID 0215
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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.
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Author Affiliations
BALMUKUND SHUKLA1 N R SANJAY KUMAR1 HRUDANANDA JENA2 ANUJ UPADHYAY3 N V CHANDRA SHEKAR1
- High Pressure Physics Section, Condensed Matter Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
- Materials Chemistry Division-Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
- Synchrotron Utilization Section, Raja Ramanna Center for Advanced Technology, Indore 452013, India
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Dates
- Published
- 26 October 2022
- Manuscript received
- 10 May 2022
- Accepted
- 20 June 2022
- Final version published online
- 26 October 2022
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Volume 46, 2023
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