Allotropy in Some Rare-Earth Metals at High Pressures
- 3 April 1964
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 144 (3614) , 69-71
- https://doi.org/10.1126/science.144.3614.69
Abstract
Allotropes of lanthanum, cerium, praseodymium, and neodymium have been observed at elevated pressures with an x-ray diffraction camera which incorporates a diamondanvil, high-pressure cell. In each case a high-pressure modification was observed which has a face-centered cubic structure. At room temperature the unit cell dimensions (a 0 ) for the high-pressure face-centered cubic structures and approximate pressures at which they were determined are as follows: La, 5.17 Å (23 kb); Ce, 4.82 Å (15 kb); Pr, 4.88 Å (40 kb); and Nd, 4.80 Å (50 kb). The unit cell dimensions for the high-pressure forms of La, Pr, and Nd apparently have never been reported.Keywords
This publication has 8 references indexed in Scilit:
- High-Pressure Transition in RbFThe Journal of Chemical Physics, 1962
- Thermal Expansion of Rare Earth MetalsPhysical Review B, 1957
- The crystal structures and lattice parameters of high-purity scandium, yttrium and the rare earth metalsActa Crystallographica, 1956
- Certain Effects of Pressure on Seven Rare Earth MetalsProceedings of the American Academy of Arts and Sciences, 1954
- The Resistance of 72 Elements, Alloys and Compounds to 100,000 Kg/Cm²Proceedings of the American Academy of Arts and Sciences, 1952
- Concerning the High Pressure Allotropic Modification of CeriumPhysical Review B, 1949
- Rough Compressions of 177 Substances to 40,000 Kg/CmProceedings of the American Academy of Arts and Sciences, 1948
- Shearing Phenomena at High Pressures, Particularly in Inorganic CompoundsProceedings of the American Academy of Arts and Sciences, 1937