Synchrotron-based X-ray diffraction was used to study the phase diagrams and determine the compressibilities of the pyrochlore rare-earth titanates Ho{sub 2}Ti{sub 2}O{sub 7}, Y{sub 2}Ti{sub 2}O{sub 7} and Tb{sub 2}Ti{sub 2}O{sub 7} to {approx}50 GPa. The bulk moduli of the cubic phase of these materials were calculated to be 213 {+-} 2, 204 {+-} 3 and 199 {+-} 1 GPa, respectively. The onset of a structural phase change from cubic to monoclinic was observed near 37, 42 and 39 GPa, respectively. The bulk modulus for the high pressure monoclinic phase of Y{sub 2}Ti{sub 2}O{sub 7} has been determined to be 185 {+-} 3 GPa.

36 MATERIALS SCIENCE↗

DOE OSTI2011

Nuclear Data Sheets for A = 222

The ENSDF evaluation for A=222 mass chain (1996El01) has been updated on the basis of the experimental results, since September 1995 (literature cutoff date in 1996El01), from various reaction and decay studies for all nuclides in A=222 mass chain (Z=84 to 92). A new nuclide ({sup 222}Po) has since been observed. In addition, new measurements have been reported in Rn, Th and Ra nuclides. The results obtained from various theoretical studies are given as comments. The updated level and decay schemes, and experimental decay and reaction data on which they are based, are summarized and presented for all the nuclides with mass number A=222. The adopted values of level energies, level spins and parities are given, and {gamma}-ray energies, intensities, as well as other nuclear properties are presented.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗