Abstract
The phase relations of a wide selection of rare earth disilicates have been investigated up to 10 GPa and 1700 °C using piston cylinder and multi-anvil equipment. Single-crystal X-ray structures have been obtained for the following high-pressure phases: (1) La 2.67(SiO 4) 2: monoclinic, space group C2/ m, Z=2, a=9.419(2), b=5.445(1), c=7.214(1) Å, β=115.71(3)°, R=0.042; disordered Ba 3(PO 4) 2 structure type, with 3× b and 7× b superstructures identified. (2) Ho 8.67(SiO 4) 6(OH) 2: hexagonal, P6 3/ m, Z=1, a=9.3221(4), c=6.7347(2) Å, R=0.026; silicate hydroxyapatite. (3) Lu 2Si 2O 7: tetragonal, P4 12 12, Z=4, a=6.5620(2), c=11.9535(4) Å, R=0.023; type X diorthosilicate structure, and the silicate analogue of tetragonal Er 2Ge 2O 7.
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