High-pressure Synchrotron X-ray Diffraction Study of the Pyrochlores Ho2Ti2O7 Y2Ti2O7 and Tb2Ti2O7

Journal Article · Sat Dec 31 00:00:00 EST 2011 · High Pressure Research

DOI:https://doi.org/10.1080/08957959.2010.548333· OSTI ID:1042178

Scott, P; Midgley, A; Musaev, O; Muthu, D; Singh, S; Suryanarayanan, R; Revcolevschi, A; Sood, A; Kruger, M

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.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 1042178
• Report Number(s): BNL-97856-2012-JA; HPRSEL; TRN: US201212%%589
• Journal Information: High Pressure Research, Vol. 31, Issue 1; ISSN 0895-7959
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PHASE DIAGRAMS
PYROCHLORE
SPIN
SYNCHROTRON RADIATION
TITANATES
X-RAY DIFFRACTION