Pressure-induced structural transitions in Tb-pyrochlore oxides

Ravhi S. Kumar; Andrew L. Cornelius; Malcolm F. Nicol; Kinson C. Kam; Anthony K. Cheetham; Jason S. Gardner

doi:10.1063/1.2165212

Pressure-induced structural transitions in Tb-pyrochlore oxides

Ravhi S. Kumar, Andrew L. Cornelius, Malcolm F. Nicol, Kinson C. Kam, Anthony K. Cheetham, Jason S. Gardner

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

The structure of Tb2 Ti2 O7, Tb2 Sn2 O7, and Tb2 TiSnO7 were studied at high pressures (P<1 Mbar) using synchrotron radiation and angular dispersive x-ray diffraction. The cubic lattice was shown to distort into a monoclinic phase before exhibiting total structural disorder (amorphization) in all three samples. Our experiments demonstrate that partial replacement of Sn with Ti significantly enhances the bulk modulus and increases the structural stability (crystalline state) to much higher pressures. Furthermore, pressure induces anion before cation disorder during the order-disorder transition. These results are compared to radiation damage studies that show order-disorder transitions.

Original language	English
Article number	031903
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	88
Issue number	3
DOIs	https://doi.org/10.1063/1.2165212
State	Published - 2006
Externally published	Yes

Funding

The authors thank Dr. Meng and Dr. Somayazulu for technical help at HPCAT and Dr. Shen for help during data collection. Use of GSECARS Raman system is acknowledged. HPCAT is collaboration between University of Nevada, Las Vegas (UNLV), the Lawrence Livermore National Laboratory, the Geophysical Laboratory of the Carnegie Institution, and the University of Hawaii. Work at UNLV was supported by the U.S. Department of Energy, National Nuclear Security Administration, under Cooperative Agreement No. DE-FC08-01NV14049 and at Brookhaven National Laboratory by the Division of Material Sciences, DOE, under Contract No. DE-AC02-98CH10886. The APS is also supported by the DOE under Contract No. W-31-109-Eng-38.

Funders	Funder number
Division of Material Sciences
U.S. Department of Energy	DE-AC02-98CH10886, W-31-109-Eng-38
National Nuclear Security Administration	DE-FC08-01NV14049

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abstract = "The structure of Tb2 Ti2 O7, Tb2 Sn2 O7, and Tb2 TiSnO7 were studied at high pressures (P<1 Mbar) using synchrotron radiation and angular dispersive x-ray diffraction. The cubic lattice was shown to distort into a monoclinic phase before exhibiting total structural disorder (amorphization) in all three samples. Our experiments demonstrate that partial replacement of Sn with Ti significantly enhances the bulk modulus and increases the structural stability (crystalline state) to much higher pressures. Furthermore, pressure induces anion before cation disorder during the order-disorder transition. These results are compared to radiation damage studies that show order-disorder transitions.",

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Pressure-induced structural transitions in Tb-pyrochlore oxides

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