Compressibility studies of RE6UO12 at extreme conditions of pressure

被引：0

作者：

Shukla, Balmukund ^{[1
]}

Kumar, N. R. Sanjay ^{[1
]}

Jena, Hrudananda ^{[2
]}

Upadhyay, Anuj ^{[3
]}

Shekar, N. V. Chandra ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Condensed Matter Phys Div, High Pressure Phys Sect, Kalpakkam 603102, Tamil Nadu, India

[2] Indira Gandhi Ctr Atom Res, Mat Chem Div, Chem Grp, Kalpakkam 603102, Tamil Nadu, India

[3] Raja Ramanna Ctr Adv Technol, Synchrotron Utilizat Sect, Indore 452013, India

来源：

BULLETIN OF MATERIALS SCIENCE | 2022年 / 45卷 / 04期

关键词：

High pressure; compressibility; order-disorder transition; actinides; THERMAL-EXPANSION; COMBUSTION SYNTHESIS; HEAT-CAPACITY; RE; SYSTEM; ND;

D O I：

10.1007/s12034-022-02788-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Rare-earth uranates-RE6UO12 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 Gd6UO12, where sharp decrease in the bulk modulus is observed. The behaviour is against the normal trend of compressibility in RE6UO12 compounds along rare-earth cation series.

引用

页数：5

共 18 条

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