Abstract
The geometrically frustrated pyrochlore Tm2Sn2O7 is an insulator with a slight trigonal lattice distortion at ambient conditions. High pressure was applied to this system to investigate the responses of structural evolution. In-situ angle-dispersive synchrotron X-ray diffraction and Raman spectroscopy analyses have been performed on Tm2Sn2O7 up to 52.6(1) GPa and 62.1(1) GPa, respectively. It was found that Tm2Sn2O7 transformed from the cubic (Fd3̅m) structure to the orthorhombic (Pnma) structure around 36.7(1) GPa. The phase transition was mainly induced by the increased cation disorder upon compression, which efficiently modified its surrounding coordination environment. After releasing pressure, both experimental results revealed that the structural phase transition was reversible.
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